Super-low Gear Ratio in a 7.25” Rear End??

Thanks for the feedback!

Interesting theory about the tach signal being applicable for an 8-cyl motor. The ratio of 6/8 is about the same as 2.10/2.76 ! Plausible theory that my tach is indeed “off” for this particular car. I should call the Holley tech support line and get their thoughts.

Also, that’s worthy of note that such numerically-low gears were indeed available for this rear end. I’ll check the shape of the differential cover. Maybe it has 2.21:1 rear end!

I’ll jack up the rear tires, spin the driveshaft exactly one complete revolution, and measure how many revolutions the tires spin. That should be pretty darn conclusive (assuming I make careful measurements).