Another thread on rear diff. lubricant.....
I didn't want to hack the other thread going on with rear diff. questions, but it influenced me to post my issue with my rear diff. I have a 2003 Chevrolet Tahoe, 5.3 4x4 133,000 miles. About two yea...
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If it calls for 75/90 then use that in a synthetic. Use one that has the additive built in because it won't hurt anything if you don't have a LSD so your covered either way.
