probably a dumb question - m-22 rock crusher | Page 3 ...
Jan 31, 2014 I disagree. I used GL-5 GM Syncomesh trans fluid for over 10 yrs and when I took my tranny apart to change some worn gears the syncos still looked brand new. Note, these were GM syncro rings and not crap from China. To play it safe I use GL-4 80w-90 gear oil.