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Mod | | | Forums66 Topics128,078 Posts1,055,935 Members48,430 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Nov 2005 Posts: 1,554 'Bolter | | 'Bolter Joined: Nov 2005 Posts: 1,554 | I have decided I am going to rebuild my th400. Does anyone have a recommendation for a good instructional book on this rebuild. Dave
1941 Chevy"First rebuild - complete!"Follow the story in the DITY1941 GMC resting peacefully 1946/1947 Chevy Street rod on s10 frame complete 1945 GMC panel truck in line for restoration 1941 Plymouth stock complete 1941 GMC COE in restoration processRead his Project Journal1941 Chevy Coe uncertain future resting now
| | | | | Joined: Feb 2004 Posts: 29,778 Kettle Custodian (pot stirrer) | | Kettle Custodian (pot stirrer) Joined: Feb 2004 Posts: 29,778 | Find an original GM service manual. There are bunches of them on Ebay, at some very reasonable prices. The TH-400 was produced from the mid-1960's to the mid-1980's with very few internal changes. It's also the basic gear train for the current 4L-80 overdrive transmission. It uses an electric solenoid for the 3-2 kickdown, and one early model called the Super-Turbine 400 used a variable-pitch stator in the torque converter. You'll need some dedicated assembly tools, as some of the clutch piston seals are VERY difficult to install without cutting the seal lips. Also watch out for a couple of identical-diameter snap rings that can be installed in the wrong position. If the snap ring with the tapered edge is installed to retain the intermediate clutch pressure plate in the case, you'll get exactly one 1-2 shift and the ring will dislodge. Always use the square-cornered ring to hold the intermediate clutch plates in place! Don't ask me how I know that!
Jerry
"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!
| | | | | Joined: Oct 2013 Posts: 97 Shop Shark | | Shop Shark Joined: Oct 2013 Posts: 97 | I bought off amazon [after researching which were the best books to get] the Workbench Series 'How to rebuild and modify GM TURBO 400 transmissions' and like it quite well ..... I also bought the ATSG manual which amazon reviews recommended. The ATSG [automatic transmission service group] manual fills in the gaps and offers all specs. etc.
Good luck with the rebuild.
lane
sweetpealane
| | | | | Joined: Mar 2010 Posts: 10,275 Renaissance Man | | Renaissance Man Joined: Mar 2010 Posts: 10,275 | I rebuilt a Super-Turbine 300 with the Switch-the-Pitch stator feature in 1982 using the Factory Manual (Buick).
Everything went back together and worked like new.
I still don't understand how an automatic works.
I do know how to read, and I guess that is all you need.
Carl
1952 5-window - return to "as built" condition | 1950 3100 with a 235 and a T-5 transmission
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