Quote:

with a 2.94 first gear and a .74 6th gear



6th gear? You mean 4th? Or is there some aftermarket version of this transmission that has more gears?

Only 4L80e I had was in my 2500HD truck...it was flawless for 150k miles.
I wouldn't use a 4L60e behind anything making decent power. I've blown up 4 of them behind some pretty mild GM LS motors.


CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'73 Chrysler New Yorker, 440, 727, 8.75
'90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt
'06 GMC 2500HD LBZ Duramax