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On my stock '75, I just re-installed the differential and installed a new sub bushing. I can't find a clear picture of one installed that I know for sure is correct. The thick washer that goes under the lower rubber bushing. does it go on the nut side of the differential mounting arm, or on top between the diff. mounting arm and the rubber bushing? I have seen both, the diagram I used was not clear. I installed it between the differential mounting arm and the rubber bushing that sits on top of it, as that's how it appeared to have been when I took it off. This means that the lock washer dug in directly to the differential arm.
I did not install mine like the photo below. I put the silver washer in the photo below between the bushing and the arm pictured below.
75 Differential Snub Bushing Washer
