The book will work for th125 or th125c lockup version this trans is also known as a 3t40 this manual has approximately 100 pages of everything you need to know about rebuilding a 3spd automatic non electric gm transaxle there is also an update supplement manual available for this transmission so check our store if you need one. Th125 transmission manual homepage transmission repair manuals rebuild parts gm th125c transaxle manual on amazoncom free shipping on qualifying there have been many engineering changes in this transmission since its introduction general motors transmission manuals auto repair manuals for car 1980 1999 . Automatic transmissions early models the gm hydra matic was a success and installed in the majority of gm models by 1950 through the 1950s all makers were working on their own automatic transmission with four more developed inside gm alone. Transmission repair manuals 3t40 th125c information about rebuild transmission 3t40 th125c one of the biggest automobile companies general motors represented a new generation of three staged gearboxes 3t40 th125c in 1980 this gearbox has got simple construction forced lubrication system and cooling system were used in first modifications. It will supply updated part numbers tech bulletins and added details to make the blue rebuild manual even more valuable a must for th125c rebuilders note this is a supplement to the blue book and will not stand on its own for this rebuild related items atsg update supplement cdrom for chevy gm 4t65e transaxle rebuild manual
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