[decooney]

REDSC400,
if you think your 428 slingshots with 4.11s, and the power range (sweet spot) you specify, wait til you get below mid 3.x range. IMHO, unless you were revving the motor between 6500-8000rpms on every shift, I would bet you are shiifting your brains out almost all the time. I would also think your 1st gear is almost unusable with 4.11 rear gears and the power range you gave.

My friends stroked 427 Drag Mustang was only 1/10th faster going from 3.31 gears to 3.89s. The big-block Cobras really do well with the taller gears; with all that torque. Less shifting too. You might want to ride in someone else's big-block car with 3.31 or 3.08s to compare.... I only say this because I know of more than three guys now with 4speeds and 3.54s that changed them out to 3.31s or 3.08s instead in Big block 427/428 Cobras.

Good Luck.