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I want to top off the rear end before going for first drive tomorrow. When building rear brakes I moved one hub and felt some play and a clank before the diff moved the other wheel (I think). Sounds like the rear end might be low on oil?? So what gear oil should I put in? I've read that Royal Purple 75-90 is good, but I'm not changing, just topping off for now so probably want to stick with non-synthetic. I don't know what's in there. Any advice?
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gear oil in 8 inch rear
