What did they (axles) come out of?

circlepilot said
Thanks for the reply. I Forgot about the drums being installed, the 11" brake drums that came with the differential, are quite large and heavy. I'll try and check the fit with the drums installed. I believe there are 10" BBP drums available?
Norm

Yes, there are 10x2.5" drums available but you would need all new hardware and backing plates as well. I use or have used the 11x2.5" drums on all of my cars, they work well. Especially with the later 11.75" B/R body front disk brakes, which also work with 15" rims.

pishta said
Measure from center of #1 stud to far edge of #3 stud, thats your bolt pattern, could be 4 3/4 3" Chevy bore. You can get your A's cut and resplined. Matter of fact, your A splines may be deep enough to cut and use without resplining? They only go in about an inch. I have some Chevy 4.75 Centerlines that have a huge bore.

Depends on the axles and the length they need to be re-splined at. A lot of the OE Mopar axles neck down after the splines, which means they can't always be re-splined to a given length. C-body and truck axles are typically the best bet for re-splining.

The axles the OP has look like C body or truck axles to me, but it can be hard to tell from pictures. He also did say he put BBP rims on them and was only stopped by the center register, I would think that he would have noticed already if they were 5x4.75".