Originally Posted by mkaake
i don't think i've seen 95naSTA have a tranny swap yet, and he'* prolly our fastest L36 around, so hopefully he'll chime in if he has any dyno info to share...
I've got the older 4t60-e which has it'* differences from the 4t65-e. My tranny is only 35k old though (dealer rebuild).
I know buck531 (L36 lumina) over at clubgp put down 233hp/251 tq with a stock tranny and intense GEN1 LSD with higher 90k+ mileage. It didn't last much longer than that dyno though.
And TimberWarp (gpgt) has been running a csc kit on his stock tranny/diff for a while now.
Those setups are both geared to higher end power unlike the m90 with it'* monster low end torque. So they are a little more friendly.
I've read over and over that the differential on the 4t65-e is the major weak link. Also, the internals are said to be very similiar between the -e and -hd. Swap the 4t65-e diff for the 4t65-hd one and you should be able to handle much more power.