I havent had a replacement transmission but I have broke stock tranny parts after a fulls shep stage 3+ build and had to tear the car back down to fix them. (800+whp pushing the car hard on a road course)
that said, i would do it all again in a heartbeat.
absolutely love my gtr
2010 Nissan GTR,TopSpeed Motorsports 4 Liter Alpha12
Motec, JRZs, HREs, Alcon SuperKit, Carbon Errything,etc
9.01@164 - 1357whp 1040tq Road Race Prepped Monster