My friend has a 1984 Chevy K20 with a 6.2 Diesel and a Turbo 400 Transmission says it running to high rpms for driving at 35 and he says it seems like it stuck in second i myself havent look at it yet but he has a 6inch lift and running 33 or 35 inch tires wants to know the best way to rebuild it so the tranny doesnt go again if you could reply asap that would be great

thanks

jason