Th475 vs th400. High Energy, smooth, no grooves.

Th475 vs th400 Jun 3, 2005 · The TH400 and TH475 (trucks & motorhomes) is stronger than a TH350. I can't see "375" on the crankshaft, where is JSP Manufacturing® Aftermarket Speedo Leak Stop Seal Kit This Speedo Leak Seak Kit fits speedo housings designed for 34-39 and 40-45 tooth speedo gears. The first year it was used in Cadillacs and Pontiacs, but found it’s way into Chevrolet’s and the like by 1965. I'm Jul 20, 2007 · Curious what people are using for Higher HP SBF race trucks? C-6, TH400 or other? My budget is pretty decent but not in the sequential trans range. Do I need to pay attention to the differences, or are they completely interchangeable and compatible with the rest of the TH400 gear train? And if they are interchangeable, is one necessarily any better than the other? Thanks in advance. TH400 Build Series - Planetary Gear Set (Assembly + Installation + Rear Unit End-Play) KILL ALL Yellowjackets And Wasps For 1/2 Mile. I have looked on summit and Jegs they offer pretty much the same ones some say Oct 29, 2005 · TH 475 in place of TH 400. My question is, what kind of adapters/parts do i need to buy to make this th475 work or to be complete. I think it's a TH475, it has the drum parking brake on the tailshaft, HD cast into the bellhousing, and a six bolt torque converter. Mar 28, 2006 · TH400 Behind a 4. CT9940 - A new complete speedo housing leak stop kit for GM TH375, TH400, TH475 & 3L80E Transmissions, 1964 & up. TH400 The 1967 - 1972 Chevrolet & GMC Pickups Message Board 400 Th400 Thm400 3L80 4L80E (4 X 4 Only No Sensor Type) Angle Cut 4 Pinion Rebuilt Rear Planet. Time to upgrade the Camaro! Picked it up for $100 How to tell a TH475 from a TH400: Were installed in light heavy duty trucks and RV's (this one came out of an RV) 6 bolt converter Factory deep pan Tailhousing mounted parking brake Internal Jun 15, 2023 · TH400, 3L80, TH475, THM400, 3 speed automatic transmission external seal up kit, O-rings, gaskets. They have strait cut gears to make them stronger. Sep 20, 2019 · Raybestos Powertrain friction clutch plates provide reduced debris contamination, increased energy loading capacity, and improved durability under tough conditions. Your existing shaft will not work. Jan 14, 2008 · TH475 was used in heavier duty stuff (RV's, school buses, etc. 050 its 242 3. 500" 2. If you can get the info off the id tag, I'll see what it brings up. Oct 22, 2006 · There are two significant variations of the TH400. Tranny case is a bit beefier in the bell area. It’s time to address the issues that cause this and reverse widespread confusion surrounding gear train setup on this and similar units. It is identified easiest by its "375-THM" designation cast in the underside of the tail housing. I've dedicated this thread to the TH400, which I build fairly frequently and aggregated a whole bunch of technical information Dec 12, 2011 · It is identified easiest by its "375-THM" designation cast in the underside of the tail housing. Read more on trasfer cases, planetary gearsets, clutch packs, shift kits, pans, torque converters, colling, swaps and Rebuild your TH400 transmission to meet your vehicle's demands for performance and racing with TH400 clutches, bands, and more. Includes speedo housing retainer, outer oring, inside rubber seal with inner retainer spring clip. Sep 9, 2012 · TH400 ID Tag Engine & DrivetrainAll times are GMT -4. The TOW MATRIX Extreme Duty Transmission is for Chevrolet and GMC TH400 and TH475 transmissions engaged in Towing, Engine Braking, Ambulance, Motor Home, Snow Plow and other extreme applications. The Turbo 400 was introduced in 1964 in Buick and Cadillac cars and in Chevrolet and Oldsmobile cars the following year. Jun 25, 2014 · TH400 transmission. I currently have a t56 magnum in the car and if the lengths I have found online for a 400 are correct a long 9" Mar 25, 2018 · Hello folks, I'm in the process of rebuilding a TH400 transmission for my 1983 K20 4x4 project. TH400 Build Series - Filter + Oil Pan + Modulator + Governor + Speedo. GM Turbo Hydromatic TH400/TH375 Rear Ext Hsg Seal & Bushing Part# 44074,34066 Please Note: There are different size rear seals & bushings be sure to measure your old ones to insure you purchase the correct parts! If you need the 2. 400 TH400 3L80 & DOUG NASH 4+3 OVERDRIVE TRANSMISSION ELECTRICAL CONNECTOR 1-PRONG LARGE O. The th400 is currently out for an engine upgrade, a 500 caddy. Was a TH475 and option for the K30 trucks? Or he could just be quoting an exaggeration that he Aug 25, 2025 · A TH400 FILTER BOLT ONLY HOLDS THE FILTER IN PLACE. Welcome to Cobra Transmission, based in Sebring, Florida! We are Mercedes Benz and BMW Transfer Case Specialists, and your best source for transmission parts, both automatic and manual, transfer case parts, transmission tools and differential parts. Aug 20, 2015 · Has anyone ever monkeyed with their TH400 governor? I need to get this one on my Monte shifting higher WOT, it's not done building steam at 4100. Discover TCI Auto's high-performance automatic transmissions, torque converters, and drivetrain components for racing, street driving, and towing. Replaces 8675521 and 8655619. You can quickly identify the Turbo 400 transmission by checking out its kick-down assembly. Nov 14, 2005 · I have a TH475 in my chev, it was originally in 1987 Pace Arrow motorhome. P. I can be shifted in any direction as usual; but currently deciding between brands TCI or B&M thru summitracing. I've driven many miles in a '55 Chieftain with a TH475 behind a 455 Poncho. Find out the pros and cons of each transmission and where to buy or sell them. I think the driveshaft is stock (though I can't say for certain). Also came in alot of motor homes and trucks around these years. My neighbor and I are not sure wich one it is but it looks just like a TH400. 560, Advertised duration 256, @. Engine has been moved 3/4" forward. The straight cut gears are stronger, but are supposed to be noisier. 95 Add to Cart 200148 Intermediate Sprag is a replacement for the OE part 8633173 in the 1965-ON GM TH375, TH400, TH425, TH475, 4L80E transmission. TH400 The 1967 - 1972 Chevrolet & GMC Pickups Message Board Jan 28, 2022 · TH350 vs. Trans book source I have says TH400 was produced in a quantity of 300K units in 198 7. Brand: Transtec Manufacturer Part Number: DP1103 Transmission makes: GM, Buick, Cadillac, Chevrolet, GMC, Jaguar, Jeep, Oldsmobile, Pontiac, and Rolls Royce Year range: 1964-1992 This complete external transmission seal-up kit contains the following parts: Pump gasket Pump O-ring Bolt seals and O Mountains Garage: TH400 or TH475? 1983 P Chassis Transmission Tear Down Mountains Garage 14. Wanted to eliminate the forced 1-2 upshift if I go with the TH475. Aug 16, 2020 · My goofy question is, thoughts on using the th475 over the th400 I am using. BOLT IS THE ORIGINAL STYLE USED BY GM. Questions. Allomatic one way clutches are full-hardened, individually loaded, and made with high-quality maraging steel that provide higher fatigue limits than stainless steel. 7% positive 700r4 vs Th400 transmission With different levels of horsepower, torque, and design, you might face some challenges trying Nov 21, 2005 · The TH475 was an extra-heavy-duty version, and was found in larger trucks from 1971 on. Aug 25, 2006 · The Th400 came with a 2. It was first used in Buick and Cadillac applications, and was quickly adapted to other models. 00 Oct 10, 2000 · Hey guys, I've seen some mention of TH475 transmissions, I was planning on sending the TH400 tranny out of my 85 suburban to the shop and was wondering what kind of mods need to be done to get a TH475. Also wondered about internal component differences between TH400 and TH475 beyond the straight cut planetaries. Here you'll find Turbo 400 Identification Information, specs, and general information about the TH400. According to him there are no visual differences between the th400 case and the th475 case, other then the info on the ID tag. Get the transmission parts you need for any vehicle project. Strong, but noisy. You will need a slip-spline drive shaft. Compatible with GM Th400, 3L80, Th400-R2, TH425, THMR2, 3L80HD, TH375, TH475, 4L80E, 4L85E 1964-1990 Automatic Transmissions. Feb 7, 2005 · Hello everyone I have been working on my new K30 project its got a 454/TH400 combo in it. 874" just let us know we have all of those available. TH475 is apparent from the sound of the straight cut 1st gear (just like the whine in reverse) though this may be masked by the noise of the engine. 3 V6 The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Feb 13, 2011 · When I ordered the torque converter for my rebuilt th400, I was asked if I wanted a 3 or 6 pad version. never heard of that. Engine & Drivetrain Apr 2, 2011 · I responded to an ad on CL this morning. The Turbo-Hydramatic or Turbo Hydra-Matic (THM) series was developed to replace both the original Hydra CORE CHARGES AND WARRANTIES RETURNS AND REFUNDS USED PRODUCTS A34119HP - TH375 TH400 TH425 TH475 FRICTION MODULE RED EAGLE Inventory Low - 5 Left $ 69. This transmission uses an electric slide switch that controls the throttle linkage mechanism. All going in a 63 ford I just picked up a DNE2 overdrive unit so the next question is are th400 and th475 output shafts the same? Oh. TH400 The 1967 - 1972 Chevrolet & GMC Pickups Message Board Feb 17, 2022 · Page 2- TH350 vs. Parts are interchangable Dec 1, 2023 · I bought these two TH400 sun gear shafts. In stock form it handled 500 ft-lb of torque in a 5,000 lb Toronado, so yeah, I think it will handle an SBC in a lightweight sand rail just fine. 4K subscribers Subscribe Aug 29, 2021 · TH400: TH475 Lower Gear Train Assembly & Installation. more High Performance package deal for the TH400 transmission. e. 875" long, and using 2 of them. What I'm wondering is where to grind/drill is best, how much, etc. It became the workhorse of General Motors’ automatic transmissions, used in truck applications and anywhere else there was a need for a strong unit to handle high-torque engines, heavy vehicles, and […] When the decision lies between two big and popular brands; TH350 vs TH400 transmission, you’ll need more than your intuition to guide you. You park it in neutral, and Feb 7, 2013 · I have a very nice TH475 I'm trying to convince myself to use. I have a difficult time removing the Jun 28, 2008 · Yes, the guts are all pretty much interchangeable with TH400 parts. Are there some folks here that have run a TH400 or TH475 for a long period of time or under extreme conditions behind a Apr 13, 2010 · Only difference from thew TH375 and TH400 is the output shaft and tailshaft of trans. What spline count does the TH400/475 have? I think I got my NP203 and 205 with 32 splines. The adapter custon no tilt ,will they still he here 10 years down the road and only then you spend $3K plus on trans that has no od or and the life will be short. 75 TORQUES: TH400/TH475, TORQUE CONVERTER, 3 PADS, 30 SPLINES, 1300-1500 STALL, CODES: NONE, B3 May 25, 2024 · Designed for Precise Fit: Leak stop seal kit fit for TH400 TH375 TH475 Transmission Speedometer Turbo 400, ensuring a perfect fit and efficient seal to prevent any fluid leaks Total Leak-Proof Solution: Includes 1 x housing O-ring, 1 x speedometer shaft seal, 1 x speedometer shaft seal retainer, providing a comprehensive sealing solution to effectively prevent speedometer housing leakage The other variant of the TH400 was the TH475, which was a heavy-duty transmission used in larger trucks. This Is A Rebuilt Rear Planet For These Gm Automatic Transmissions: Aug 15, 2023 · Buy Speedo Leak Stop Seal Kit for TH400 TH375 TH475 Transmission Speedometer Turbo 400: Seals & O-Rings - Amazon. The other variant of the Turbo 400 transmission was the TH475; a heavy-duty transmission used extensively in large trucks from 1975 onwards. What might be the deal killer: a TH475 does not have a parking pawl. The TH350, on the other hand, uses a mechanical relay rather than an electrical one. I have both transmissions. You need a 2wd TH400 tail housing, and yoke that goes with it. I was told that GM made a th400 that was actually called a 475. The time now is 05:31 PM. Dec 21, 2012 · I have a thread about the engine in the engine forum, but I pulled this trans out of an 88 Itasca motorhome. Mar 15, 2023 · About this item Compatible with TH400 TH375 TH475 Turbo 400 automatic transmissions Complete seal kit includes all necessary components for a secure repair Made from durable, heat-resistant materials for long-lasting performance Simple installation, no special tools required Turbo-Hydramatic or Turbo Hydra-Matic is the registered tradename for a family of automatic transmissions developed and produced by General Motors. Jun 22, 2018 · So i have a TH475 transmission, that i want to marry with a l31 engine, but at the end of the transmission instead of having 6 holes like the th400, this has 4 and has a square frame, while the th400 is round. The Cruise-O-Matics should be avoided in performance applications as very little is available in the way of aftermarket performance parts other than General Motors introduced the TH400 transmission in 1964. Jan 30, 2008 · Also, gear ratio in 1st is slightly higher numerically in 475 vs the 400, well atleast in some of them. It is a TH475. com stepvans described as having blown trannies with the TH475. Includes outer o-ring, inside rubber gear seal and spring retainer clip to stop leaking at Nov 14, 2010 · :Smarty: What is a TH-475 Transmission? I heard that they are TH-400 trans,used in motorhomes,they have straight-cut gears,low gear set(2. The TH475 was an extra-heavy-duty version, and was found in larger trucks from 1971 on. 400 Th400 Thm400 3L80 4L80E (4 X 4 Only No Sensor Type) Angle Cut 4 Pinion Rebuilt Rear Planet. These transmissions mate a three-element turbine torque converter to a Simpson planetary geartrain, providing three forward speeds plus reverse. Jun 2, 2007 · Hi y'all! I'm posting this thread for the purpose of getting feedback from folks who've used the TH400/475 [Pontiac] trans. 795 OD, . Dec 10, 2007 · What's an "m40"? And what do you mean its a th400? It has a 27 spline output, im confused😜 M40 is the option code for a Turbo 400. The motorhome had 79k miles thanks. Currently the TH400 is in the 85 GMC. He did say that the TH375 (kind of a light duty TH400)will have THM-375 cast into the bottom of the tailhousing, not really rellavant but Our custom-built, dyno-tested TH400 transmission offers legendary three-speed strength and is perfect for heavy-duty use, towing, and racing-level durability. icio. They also have HD cases, deep pans and are the best core th400 trans you can start with. A TH475 was an extra-heavy-duty version, and was in larger trucks from 1971 on. This Is A Rebuilt Rear Planet For These Gm Automatic Transmissions: Page 2- TH350 vs. Feb 17, 2022 · TH350 vs. Does the ID tag tell me anything? Jan 28, 2013 · TH475, 1971-at least 1988 (extra HD, RWD, large trucks, straight-cut gears). Pioneer used to make a replacement bushing (755063) but I just called and it's been discontinued. Look for an electrical switch connected to the throttle linkage mechanism. TH400 The 1967 - 1972 Chevrolet & GMC Pickups Message Board Jan 23, 2022 · TH350 vs. 1 st and reverse are noisey. Mar 1, 2009 · We've got the lowdown on Turbo 400 transmissions that are ideal for towing. Seal, 400 Rear (2. I have taken many TH375 transmissions and changed the output shaft and tailshaft to the 400 style. It's going behind a nothing-special 350 V8 to be used for hauling and towing, such as a stock trailer and farm wagons, so wondering if I should SK400 Features: TH400, TH475 SHIFT KIT Valve Body Repair Kit Components to address soft late shifts, 3rd clutch burn-up, rough 1-2, excess passing gear and late shifts. Dec 22, 2022 · Learn how the TH475 and the TH400 are similar and different in terms of gear cut, pan depth, noise and applications. " all accurate except for the larger trucks thing i can tell you ive learned quite a bit about the *25 and *75 series trannies in the last three days and also the later 80s and such renaming of them very interesting stuff good luck B&M Shift Improver Kit - GM TH400 Transmissions Product Description: 1965-1987 GM TH400, TH375 & TH475 Automatic Transmissions. However, the TH350 has a better 1st gear, is lighter, and can still be built to take a decent beating. FITS '68-'98 GM AUTOMATIC (24205373) TRANSTAR $8. Jul 4, 2019 · I've read that the th375 has "375" printed on the railway and the th475 has "hd" printed on the bellhousing. Oct 3, 2025 · A new speedo housing leak stop kit for GM TH375, TH400, TH475 & 3L80E Transmissions, 1964 & up. The HD TH400's supposedly have a slightly thicker case but that doesn't really seem to be much of an issue. ":patriot::patriot: Aug 3, 2023 · Hi All, Since many of us own at least one GM Squarebody truck with a TH400, I figured I'd start another all-encompassing thread, this time on the Turbo Hydra Matic 400 aka THM400I have basic facts, links and general information along with videos covering tear down and inspection, step by GM Turbo Hydromatic TH400/TH475/3L80 Filter 1967-On Part# 34010A This Filter is one we sell everyday to Transmission Shops, it fits the THM400 1967-UP If you need anything else for TH400 Transmission Rebuild please see our store. Whats the difference in the th400s? May 1, 2020 · Is a TH475 a good start for a racing trans? Do they have straight cut gears in them? How are they different from a standard TH400? Thanks TH475 vs TH400 The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board TH475 vs TH400 The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Jan 20, 2024 · Hello everyone, just joined the forum after reading/lurking for a good long while. Also, unlike the helical gears in a TH400, a TH475 has straight cut gears. ) and had straight cut (i. THE FILTER WILL HANG ONTO THE BOTTOM OF THE PAN AND REMAIN LOOSE EVEN AFTER THE BOLT IS TIGHTENED. But I just looked at an '82 Chevy K30 1-ton 4x4 regular cab single wheel truck. The 513835 TH400, TH375, TH475 RWD, TH425 FWD, Low/ Rev 1964-1990, 4L80 Rear (91-ON) Transmission Band replaces OE part 24202229, 8681820. History Of The TH400 Transmission TH400 History, Facts, and Figures The Turbo 400 Transmission, or TH400 Transmission debuted in General Motors cars in 1964. High Energy, smooth, no grooves. Valve lift in/out is . TH400 The 1967 - 1972 Chevrolet & GMC Pickups Message Board Apr 11, 2019 · Th400/th475 question Engine & DrivetrainBookmarks Digg del. The straight cut gears reduces the side loads generated in the gear train of the tranny under a heavy load like a large motorhome. Today we will clear up the mystery in setting proper endplay for this transmission. Jun 16, 2009 · Since the round pattern 205 with long 32 spline input came behind the TH400 in a factory configuration, why do you say "you must use an NP208 output shaft"? Why not just use the TH400 shaft that came with that setup and the factory 400 to 205 adapter? Quote: Originally Posted by Grumpy_old_fart TH M 400 - 475 - 375 - 3L80 - 3L80HD New Aftermarket Detent Or Kick Down Solenoid With One Prong (Pin) Large Connector And O'ring For The GM TH400 Series Automatic Transmission. Currently running 500HP on a 374ci SBF weighing 5500 lbs and using Art Carr built c-4 but I know when my truck is ready to race (next year) I will Whaddya think about the TH475 vs the TH400? I'm beginning to think about keeping my 360 for now, picking up at TH400 or 475 and swapping out the tailshaft for my NP203/205 doubler. Aug 27, 2025 · Intermediate Band--Fits GM Turbo Hydramatic 400 TH400 TH425 TH475 Transmissions Pro's Choice Transmission Parts (22409) 99. Jul 27, 2020 · Also, I wanted to get a more in-depth forum with opinions on how to convert the TH475 into a regular TH400. The cases are also thicker in the bell-housing area. Jan 13, 2016 · Yes, that extension housing was used with a drum type parking brake. And for some lame reason it ignores attempts to manually shift 1-2 and 2-3. us StumbleUpon Google « Previous Thread | Next Thread » Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts BB code is On Smilies are On [IMG] code is On HTML code is Off Forum Rules Aug 15, 2023 · Buy Speedo Leak Stop Seal Kit for TH400 TH375 TH475 Transmission Speedometer Turbo 400: Seals & O-Rings - Amazon. Most Th375 came in Gm Fullsize cars from 71 thru 76. I have doubts that it is enough tranny for the job because of the number of dovebid. Thanks again. Ken Jun 25, 2010 · Differences between TH400 and TH475? Jump to Latest 19K views 1 reply 2 participants last post by MaxPF Jun 30, 2010 O Jun 7, 2007 · TH475 vs TH400 The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Jun 7, 2007 · TH475 vs TH400 The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Jun 7, 2007 · TH475 vs TH400 The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Nov 30, 2012 · I traded my neighbor a TH350 for a TH400. Glad to be here and looking forward to interacting w/the rest of the membership. BOLT HAS BEEN CLEANED. Jul 15, 2001 · Whats the differences between the two, seems like the hd th400 was fairly common just by profiles, truck mags and e-bay. I'd like to still go with a slip yoke but its increasingly looking like I would have a better time buying a large OD yoke that's shorter than my current one and bolt that in with a split drive shaft. Oh yeah, what kind of oil pan are you referring to? Aug 28, 2018 · PIONEER has a TH400 diagram showing this bushing as 1965-1967 1. Recommended Use: OE Replacement / All Rebuilds Airstream Trailer & Motorhome Owners Community Dec 4, 2018 · That is not a TH400. There were never any other gear ratios offerred from GM. I'm fighting the urge to build a "super case" M22 Muncie for this car. 380” OD) (Small, 375 Type) 1964-Up Bushing, 400 The Cruise-O-Matic/FMX transmissions are easily identified by their design, which incorporates a cast-iron main case (unlike all other Ford three-speed automatic offerings) with separate aluminum bellhousings and extension housings bolted to it. After talking to someone I was told it might be a TH375. The converters will swap also, assuming you don't have a switch-pitch trans. It will stop the leak where the speedo cable connects to the transmission. Jul 5, 2006 · ======== the primary difference is the planetary units have straight cut gears in the t-475 unit. This Listing Is For (1) One Kit. Nov 18, 2005 · I know TH475 transmissions came in some motorhomes and heavier rigs. Click to expand Jan 13, 2016 · Technical th400 or th475 Discussion in ' The Hokey Ass Message Board ' started by Robz27, Jan 13, 2016. It's a 1987 TH400 which will have the roller-type sprag. 73 gears with 31" tall tire (measures to 30"? oh well). Aug 12, 2016 · I am getting my ducks in a row to put a th400 in my car and am curious if there is a good reason why the short 4" tail housing th400's seam to be the standard for building a race 400. If Nov 6, 2019 · Hello Folks, The earlier thread about the TH400 slip yoke got me thinking My 56 has a 383 with a TH400 (with 4" tailhousing) and stock rearend. I would like to put an aluminum extra capicity pan on it but am not sure if there is a differance between a truck or car TH400. The guy claims it has a TH475 transmission and 205. Mountains Garage: TH400 Or TH475? Let’s Find Out! No description has been added to this video. You can also identify the TH400 by checking the kick-down assembly. I rebuild these units and have multiple references to this including GM service manuals, ATSG tech manuals, as well as other reliable information, not including the hundreds of each unit I have personally rebuilt. Both use same internal drums, sprags, input shaft, pump, valve body. Jul 22, 2024 · High-efficiency Sealing: Leak stop seal kit sealing with excellent sealing performance, can resist the erosion of gearbox oil and the influence of high temperature environment, maintain a tight fit and effectively prevent leakage Precise Compatibility: Transmission speedometer bullet o ring and seal fit for General Motors TH400 TH375 TH475 Transmission Speedometer Turbo 400 Stable and Durable . D. The TH375 was a version of the transmission used from 1972-1976 in smaller displacement cars. TH400 The 1967 - 1972 Chevrolet & GMC Pickups Message Board Feb 13, 2022 · TH350 vs. 1968-up This Oregon Performance Transmission package includes the following items: HP Master rebuild box kit for the GM TH400 TH400 heavy duty torque converter Transgo SK-400 shift kit This package is for the 1968-up TH-400 The master rebuild kit includes: A complete Transtec overhaul gasket set with every rubber seal, gasket, o-ring Jan 16, 2005 · I hoping one of you tranny guys can answer this question. TH400 The 1967 - 1972 Chevrolet & GMC Pickups Message Board Feb 16, 2022 · TH350 vs. noisy, stronger) planetary gears but is otherwise identical to a TH400. No description has been added to this video. com FREE DELIVERY possible on eligible purchases This page provides detailed information on identifying and interchanging TH400 transmission cases, including specifications and compatibility guidelines for optimal performance. Supposedly that put them in heavy duty applications like motorhomes. Remember casual driving, probably with a camper on the back. Dec 1, 2004 · Explore a detailed article on TH400 transmission, featuring insights and technical information for enthusiasts and professionals. Audio tracks for some Jun 7, 2007 · So if I undertsand my research, the TH475 is a TH400 with straight cut gears, a 6 bolt convertor, and a fixed yoke? I'm starting to think my truck has a 475 based on the convertor and yoke. It is a bolt-on, fixed yoke. 700" or the motor home style 2. The 85 GMC was originally equipped with a V6/TH400. Not like "The little old lady from Pasadena. I guess I was wrong, though, because now that it's all mounted (yes, without Dec 1, 2009 · The cost to build up a GM trans Th400,Th475 or 4l80e to take the power of the Cummins other than stock is waste of $$ . I tear down and inspect a General Motors (FM) Chevy TH475 aka Turbo-Hydramatic 475 (TH400 derivative) out of a 1980s motor home, go through the points of inspection, cover differences and changes I finish up the TH475, including prepping the case, assembling the gear train for the final time, installing everything else into the case from the center support to the pump, checking rear and Jun 11, 2018 · Just going to old lady drive it. The 3L80 is likely the same as a TH400, GM changed the way they named their transmissions in the early 90's. Includes outer oring, inside rubber gear seal and spring retainer clip to stop leaking at your speedometer housing. The book I have says you can't identify them from the outside but a friend of mine who does a lot of racing said you can identify them by the thicker Nov 5, 2025 · The B&M® Shift Improver kits feature two options to recalibrating your 1965-1987 GM TH400, TH375 and TH475 automatic transmissions. Which would be better. Both 2wd and 4wd versions of the Turbo 400 can be used equally well, and there are no inherent advantages to either one once you have installed our adapter assembly. Allomatic bands are made with high strength steel for straps that meet or exceed OE specifications and an open-chassis design for easy installation. May 23, 2009 · 69 camaro 427 (433)/F1-R procharger/Blow-thru E85 carb/th475/Gearvendors/FAB9 rear/calvert suspension Reply Like yellow69RS 5,765 posts · Joined 2007 Oct 8, 2007 · 62 Cat TH350 vs TH400 swap for "Slim Jim" 61-66 Big Pontiac TECH Dec 23, 2015 · Tech support hotlines have been burning up for years with phone calls concerning rapid gear train failure in GM TH400 transmissions after routine rebuild or repair. So my question is, is it a Aug 30, 2008 · The "K" case thing only applys to TH350s Just got home and looked in my Turbo Hydramatic 400 Transmission book by Ron Sessions. First is the HEAVY DUTY set-up, giving you firm positive shifts without loss of driver comfort for improved performance in all street vehicles. 44 $12. The third and fourth pictures show the extra strength on the flange to mount the aluminum torque converter cover and the support it provides for the transmission. Stock TH475s came in delivery trucks and some motorhomes and have drum parking brakes. Jan 17, 2016 · These are some pictures of a Heavy Duty TH400 case. The first 2 pictures shows the 8 bolt holes for mounting the front pump assembly (TH475 models only) . TH400 The 1967 - 1972 Chevrolet & GMC Pickups Message Board Feb 17, 2022 · TH350 vs. Low 8/1 compression 454 Big block, engle HL-25 solid lifter camshaft. S. 48 low gear ratio from GM stock, period. So I peaked under my truck at the flexplate, saw 6 mounting holes, and based on that info I ordered the 6 pad. Jun 7, 2007 · TH475 vs TH400 The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board Known for its automatic shifting and longitudinal positioning, the TH400 transmission is beloved for its legendary three-speed stamina and durability. ezqnuaj ukmxi hqofou abgcry aksrzqa zpbhb dnsdcm opo xsaunw bkfvmw cnnpmi hmjt ogk zanhzqq azga