Tranny Swap
The standard MM6 in any f car is rated at about 460 ft lbs, if my memory serves. As for aftermarket, syncros, inner and outer cones, and a few other components are changed.
I have MM6 transmissions taking 600 ft lbs, without any major work, so I would say it safe. If you change your fluids on a regular interval, you should be fine for some time to come.
Besttoyou, c4c5

