GM 4L80E Archives - Transmission Digest
Multitasking: Sorting out multiple issues with the same vehicle

While it’s common for a customer to bring us a vehicle with a single, specific complaint, we often find more than one problem when getting into the diagnosis of their original concern. The owner only knows one thing; they want the vehicle to run and operate properly. It’s our responsibility to identify and execute a

Alto adds to intermediate clutch PowerPack line for GM transmissions

Alto has introduced two new products in its intermediate clutch PowerPack line for GM transmissions. The first (Alto part no. 031757BHP, pictured above) covers GM 3L80, TH400, TH375, TH425 and TH475 transmissions, model years 1964 to 1995. The second (Alto part no. 031757CHP, pictured below) covers GM 4L80E and 4L85E transmissions, model years 1990 and

Alto introduces steel plate for GM transmissions

Alto has introduced a new steel plate for a variety of GM transmissions. Applications covered include the 3L80/TH400, TH375, TH425, TH475, 4L80E and 4L85E for model years 1990 and on. The forward and direct steel plates have 14 teeth and measure .077 in. According to Alto, this updated steel plate has a set of 14

GFX introduces new oil pan lines for various GM transmissions

GFX has introduced a variety of new oil pans for several different General Motors transmissions.