Shes working pretty good as the MPH shows less power than the ET does. Signs of a good working combo... I think that might be because he has 4.30 gears and it is laying over in the lights since it is past the power peak. Just my guess. He is going to swap over to 3.90 gears to see what happens. Any thoughts on this ... 3.90 gears vs 4.10 I have both sets .. For reference we've just gone from 4:10's to 3:73's (Dana 60). So far we've lost 0.1, 1 mph in the 1/4 and 0.05 in the 60 (going off similar weather conditions). Stalls gone up 800rpm and we have 16% slip at the stripe 
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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