I think it depends on who builds it and what they put back in though. I know a lot of people well over 100k who have cammed motors and such and they're still fine on stock trans.
Yea, and I bet they are not in Tahoes or Suburbans... They are in CARS or light ass RCSBs or something.. Think about it, its physics. Ive had all build from diff shops and had top parts installed. The 60/65e is suited for a light weight application. Put some weight behind it like a Suburban or Tahoe, and then put some power to it, like a SC 5.3 or a built 408 and see how long a built 65e last in that application where tq itself output tear itself up....
TQ managment is the ONLY WAY a 65e tranny will survive a heavy vehicle. A 80e will get the job done with 0 tq managment needed. A realy truck tranny. You can pick one up from the local junkyard for 300$ if that, ready for 600hp with a shiftkit installed. Not a 60e, they can be found with broken sunshells.
---------- Post added at 04:32 PM ---------- Previous post was at 04:29 PM ----------
Main reason GM developed TQ Mangment was to solve this very problem... And make the 65E workable...