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 on. Both come with G3 performance frictions.