Re: Looking at used rear end
Things to look for
Color of oil, dark black, looking like it's never been changed. Oil should be brownish, able to see into it, not like it was a solid. Take a small magnet, run it through the fluid, see if anything is on the end.
It's not easy to check housing straightness...
Look for a small contact patch on the ring gear, kinda like a long oval shape, maybe 1-1/2" long. Centered on the middle of the gear tooth. Preferable the spot will be in the center of the tooth, better is closer to the inside of the tooth. If the spot is close to the outside of the gear tooth, that is the least desirable. But that could work depending on how the gears were set up. You never know.
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