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Axle - Timken 51540 Specs
The Timken semi-floating rear axle was available in 4.88, 5.38, and 6.17 ratios. Normally 11" x 2" drum brakes were used. They do not have a differential cover, they split down the middle of the differential, making them easy to identify.

The Timken 51540 was used in the Willys Pickups between 1947-55.

This axle is considered light duty, so if you are considering larger tires or a larger engine you may want to swap this out.