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Automotive Transmission Forum

Professional automotive forum for discussion of system analysis, diagnosis, and repair of vehicle transmissions, transaxles, and drivetrains. This forum is for experienced automotive repair professionals only, membership required.

Continue to the description of our next automotive discussion forum, the Classifieds Forum.

Recent Automotive Discussions in the Automotive Transmission Forum

ATF test for Glycol
10/17/2025 in the Transmission Forum
Can anyone vouch for the efficasy of Acustrip's 711254 ATF Glycol Test Strips ? Is the Nelco Gly-Tek test kit preferred ? Other ? Thanks !
Mazda Miata wrong bolt mistake
10/09/2025 in the Transmission Forum
[Transmission: 00 Mazda Miata 1.8L] After being warned on this forum not too long ago that this could happen, it did happen.I forgot to warn my tech. Went to do a drain and fill on this Miata and the tech pulled the wrong bolt. Something inside went clin...
Allison rear extension housing 4WD
10/07/2025 in the Transmission Forum
[Transmission: 03 GMC Sierra 2500 HD SLE 6.6L] Have this Allison that broke the rear extension housing. Customer wants trans replaced, but I may need to replace the rear housing in order not to get too beat up on the return core. anyone have any idea whe...
GM P0711 Service Practices (8L45, 8L90)
09/29/2025 in the Transmission Forum
First, thanks to Robert Duncanson for this excellent post: It was my introduction to this ongoing issue on the GM 8 speed transmissions. It looks like my first related repair is coming fast. Here's the rub: Robert suspected that the inline connector was a...
2020 spark trany -40 temp reading
09/08/2025 in the Transmission Forum
have a p1790 code cannot do relearn as temp senser says -40 all time. where is temp sensor and can it be replaced without replacing valve body. first time i have seen one of these . car seems to drive ok . have done a complete reprograming of car . did no...

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