Quote Originally Posted by Fast355 View Post
5.3 is somewhat weak in low-speed torque and I would put money on that Regal having a rear axle ratio in the mid to low 2s. Not exactly the combination for a strong runner. LS1 F-cars were a bit undergeared and the autos had 2.73s.
Possibly, my dad's 79 reagal though had 4.10s. But it was a factory 4 speed v6.has a Pontiac 400 now.
( Need to get that thing back on the road )
But yeah, an auto with a 1:1 trans is probably geared too high for the tall OD of a 4l60e