The 5 speed tranny uses brass synchros and the Owner's Manual says to use GL-5 gear lube. GL-5 has a sulfur base and will eat the brass I believe that is the reason the AX-5 & AX-15 trannys have a bad rep for failure
I just bought a 2000 TJ w/ 4 banger and 5 spd... I haven't done any research on this yet, but would you happen to know if my Jeep has the same brass synchros? If so, what would you experienced Jeep Peeps recommend as a lube?