my stock tranny died at like 140k miles.. tons of abuse and back then i didnt realise trannys had a filter so it wasnt changed. I bought a factory replacement tranny at cost and put a shift kit in it.. i actually like it now that i have a shift kit. I put it a tad to firm though. I wouldnt own another gm tranny without a shift kit. period. the main problem with gm is that they try to make everythign for a grandma. so if you push it it gives. same thing with the tranny, to much slipping for a soft shift and it craps out. s10s are the worst. shift kit is night and day and is only like 40 dollars.