Originally Posted by SlowGreyGT
Trans gears also play a big role in that as well, not just rear end gearing. A lot of 5.0's need to make a gear switch when going boosted because with stock gearing will either make you run out 4th or force you to throw 5th before the traps which either way slows you down. Switching to the 3.15's will certainly help him in that area.
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I think he said that he should be able to cross traps in the 130s in 4th, but not sure where in the RPM in 4th.
Mathwise, based on the tires he has (which I think are 275/60/15 M/Ts) and the gearing in the MT-82, 130 would be about 6500 RPM, so he has enough gear to stretch 140 in 4th, maybe even 145 if he runs it to 7200-7300.