what is your take on used gears????.. I an pretty much have them for nothing...I hear its all in the person who installs them....but has anyone ever had an issues with gear whine on a used set?
I have heard it depends on the manufacturer of the gears, I bought a set from a generic company and they whined for the first 10K miles due to the inexact cut of the gear. I Later learned that the Ford Motorsport gears do not whine. As far as the gears go look at each tooth very carefully for chips or nicks, If there all clean your probably fine. Specially if there free!
The aftermarket gears aren't vut to the tolerances that the FMS are. If you buy a set that are used they need to be set-up correctly using the correct tools like a depth gauge.
In my last two cars I have put used gears in them...or had them installed, I didn't do it..and they worked fine in both cases. Just check for chipped teeth and make sure the wear pattern is good and you will be fine. If they are worn uneven or on one edge, or you see chipping on the teeth just toss them. Otherwise go for it.