[ericnova72]

I'll probably grab a set of 4.10s as well and compare down the road-

With 4.56:
65mph rpm is 2400rpm.
125mph est trap speed 1/4 mile its 4585rpm

4.10
65mph = 2150rpm
125 mph= 4250rpm

373:
65mph = 1950rpm
125 mph= 3750rpm

The numbers look correct,....
But you should never be in overdrive in a drag race, the Od gearset is not capable of living with that for long. It is strictly a low power, cruising speeds gear, not a performance gear.
Trans valvebody shouldn't even make/allow the WOT upshift to OD.
You also shouldn't be in lock-up on the converter at WOT, most converter clutches aren't capable of withstanding WOT for long either.
Takes an expensive converter to get one built to handle full power in the converter clutch.

Figuring 1:1 in Third gear, 4.56, 28" tire, 7% converter slip for a nice tight 3200 stall converter would put you at 7300 rpm @ 125 mph for a WOT drag pass.