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Description
GM THM 3T40 (125C) Transaxle found in many GM vehicles and Opels.
Covers transaxle assembly dis-assembly diagnosis and troubleshooting
Note: There have been many engineering changes in this transmission since its
introduction. ATSG also has available an "Update Handbook" which includes
the many changes and is required along with this manual for a proper overhaul or repair.
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; "125C")
 update handbook.jpg "3T40 (125C) Update Handbook")
