[kpbrown31]

Originally Posted by Bill Hanlon

Assuming the smoking tires are 26" in diameter, 3.43 rear gears and a max engine RPM of 5000, max MPH in gears are 46, 76, 113 and 151. 60 MPH cruise in 4th gear would be at 2000 RPM.

I'm running aftermarket 17" wheels. If I remember the tire size correctly, they are about 27.13" tall.

[rustyrelic]

The 3:42 gear set is fairly rare, but it is out there. Mostly found in 2+2 cars. they come up for sale every so oven, but they will be 50+ years old used parts. Myself I would have kept the 461 and gone ahead and added the 4L80E. A 2:93 or 2:73 would have been ok with the low down torque of the pontiac.

[Bill Hanlon]

Originally Posted by kpbrown31

I'm running aftermarket 17" wheels. If I remember the tire size correctly, they are about 27.13" tall.

Just multiply each MPH value I posted by 1.043461538461538 to figure speed at the same RPM.