8.8 rear end (both tires are locked together)

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A properly working posi-style rear end would be impossible to turn with one wheel on the ground. After rebuilding my T-loc, and doing the same test I could not spin the tire that was off the ground by hand. Depending on how long that aftermarket diff has been in the car, it may still be fresh enough to offer that resistance, and commensurately may make noise when cornering

As to why it didn't before, and now after the gear change, may be attributable to the taller gear making it harder for the inside tire to spin, by slowing it down.