Why are these two different?

[blown motor]

74 Challenger, 8 3/4 rear end. You can see that it different on each side where the axle goes in. One side is straight cut and the other side is notched. What's that about?

[Brads70]

notched side is the adjuster

[blown motor]

Gotcha. Thanks Brad.

[anlauto]

The notched one should be on the PS, and there's a special washer on one of the studs that locks the adjuster