IF it were a noise bothering me, I surely would change the oil first,,,
My daughters '96 S-10, manual transmission and 4.3 engine, and 4WD was making tranny noise, and was hard to shift.
I found the right synthetic oil for the transmission, and changed the oil,
about a week of driving later, no noise, and the shifting was easy again.
My '95 Suburban always howled a little from the rearend. It got worse at 100,000 miles
I changed to synthetic oil, the noise was gone.
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