There's a big difference in consequences between a 700R4 and a T5.
The 700R4 will begin to make unwanted downshifts continuously (shuttling) under certain speed, vacuum and load conditions with tall gearing (which may be fixable with some valve body mods - see TransGo), especially with that cam.
The T5 will lug the engine in high gear under similar conditions, but you'll feel it, if you don't mind downshifting.
If you do much driving in traffic you'll find yourself in 4th a lot.
Your mileage may be worse at 50 than at 70, especially with that cam.
