I am planning to replace the ring and pinion set in my '63 Biscayne to a more cruising friendly gear ratio. I think the axle ratio is 4.11 or possibly 4.56. I cannot tell from the external markings on the differential housing and I have not removed the pumpkin to count the gear teeth. At 70 mph, the engine speed is 4000 rpm. It gets very noisy at higher speeds, although the 409 doesn't give a damn and keeps pumping out power.
My question for the group is whether ring and pinion gears are the same size for positraction versus standard differentials. Show Cars and Ecklers sells gear sets for a wide range of axle ratios (3.08, 3.36, 3.55, 3.73, and 4.11), but they make no distinction between posi and standard.
Dan Fults
My question for the group is whether ring and pinion gears are the same size for positraction versus standard differentials. Show Cars and Ecklers sells gear sets for a wide range of axle ratios (3.08, 3.36, 3.55, 3.73, and 4.11), but they make no distinction between posi and standard.
Dan Fults