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Would the mark have been to indicate for use with 8" or 9" housings, or to indicate that the u bolts had been tightened?
I can tell you that I found my pink marks on my original u-bolts from my sprint 6 cylinder rear end. so, not sure if it is size.
Location seems to be different. Mine were towards the bottom, tomtri66's were at the top. Maybe depends on year and plant??
Remember that other car models were built on the same line so not always referring to just Mustang applications. Since all the reports so far are from Mustangs and are similar color the size idea seems to fit so far since they all used the same rearend shock plate I believe
Maybe I misunderstood. Were you referring to the axle size (ie. 7-1/4", 8" or 9") or the size of the axle tube?
If so then I must have not been clear or written my post well. Was referring to the size of the U clamp. Since all use the same rearend shock plate they should all be the same (honestly have not checked the parts book to confirm)