depends on how you drive it... i hear crap all the time about how weak the NV3500 is, yet dodge used it in their 2500LD trucks and some people have done 6.0, 454, & even 8.1 swaps with them & been fine.
00 FRC - just top end, exhaust, and a hot-air intake
99 Sierra - 5.3 / 5spd
↓ click the pic for the build ↓