Re: High Speed Rear End for 1941 Packard 110 club coupe?

Posted by TxGoat On 2023/4/24 7:32:14

The standard axle ratio for the 1941 110 is 4.3 to 1. Optional ratio is 4.55 to 1, and overdrive equipped cars came with the 4.55 to 1 axle.

The 1941 120 series cars had a 4.09 to 1 axle as standard equipment.

A 120 series axle would probably fit under your car.

The 110 cars came with 6.50 X 16 tires, while the 120 cars came with 7.00 X 16 tires. The 7.00 X 16 tires are larger in diameter and will reduce engine speed at any given road speed somewhat. Some 7.00 X 16 tires are 31" in diameter, while some 6.50 tires may be closer to 28" in diameter.

The ideal setup for your car would be to install the overdrive transmission with the appropriate axle ratio. Changing tire sizes or axle ratios will affect speedometer accuracy.

The first thing you need to do is to determine exactly which axle ratio your car presently has.