Drive Train Axles Bearings problem
2003 Ford Ranger 6 cyl Two Wheel Drive Automatic 90K miles
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I bought a 3.55 ring and pinion off Ebay that the seller said was in excellent condition with no abnormal wear patterns to replace the 4.10 gears I currently have from the factory. Am I likly to have noise from the used gears that one blogger said " will drive you nuts " ? I plan to have them professionally installed. I'm doing this to improve mpg.

Thank You
David

P.S.
The ebay seller has 100% positive feedback and seems this is his business