Rear Axle Length

Sorry Steve, trucks have equal length tune. I believe the OP's axle came from a truck.

Mopar cars do not have equal length tubes or axle lengths when running a Dana 60. Pull the axles out of a B body rear and stand them up next to each other, they aren't the same length. They will be 1 3/8 difference. I have at least one set of 68-70 B body D60 axles standing up in my garage if you'd like a picture.

Also have a factory DC A body rear and it's got different tube lengths/axles.

8.75's do have equal length axles. The center pumpkin takes up pinion offset.