Pull the cover and inspect the rear before you condemn it.
If you aren't changing gears, I would almost guarantee re-using the shim configuration in there now will get you right where you need to be. Keep track of left and right carrier and pinion shims when you disassemble. I would still sanity check the pattern and verify backlash when you re-assemble. If the axles are worn, I would suggest finding (2) good ones from the JY if you can. I think aftermarket replacement parts are junk, and repair bearings are an even bigger joke.
The differential is a much simpler undertaking than the AOD!
If you aren't changing gears, I would almost guarantee re-using the shim configuration in there now will get you right where you need to be. Keep track of left and right carrier and pinion shims when you disassemble. I would still sanity check the pattern and verify backlash when you re-assemble. If the axles are worn, I would suggest finding (2) good ones from the JY if you can. I think aftermarket replacement parts are junk, and repair bearings are an even bigger joke.
The differential is a much simpler undertaking than the AOD!
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