CRM1988 Posted July 6, 2018 Share Posted July 6, 2018 88 MJ 4.0, ax15 transmission. When driving and let of the gas I’m getting a grinding noise but if I get back on the gas it goes away. Really confused right now. Link to comment Share on other sites More sharing options...
gogmorgo Posted July 7, 2018 Share Posted July 7, 2018 Does it grind while coasting in gear, in neutral, clutch in/out? my thought would be the rear diff is having issues, but that's really just a guess. Link to comment Share on other sites More sharing options...
Ωhm Posted July 7, 2018 Share Posted July 7, 2018 Check for loose starter bolts. Link to comment Share on other sites More sharing options...
omega_rugal Posted July 7, 2018 Share Posted July 7, 2018 what grinds? the tarsmission? soudns like a differential problem Link to comment Share on other sites More sharing options...
Eagle Posted July 7, 2018 Share Posted July 7, 2018 It could be bad synchronizers. Does it sometimes pop out of gear when you're coasting? By the way -- did you swap the transmission? Because an '88 should have a BA 10/5, not an AX-15. Link to comment Share on other sites More sharing options...
CRM1988 Posted July 7, 2018 Author Share Posted July 7, 2018 It's grinding with the clutch out while coasting, I can push the clutch in and it will quit. It is starting to pop out of gear also. Yes the BA has been swapped out for the AX. Link to comment Share on other sites More sharing options...
Eagle Posted July 8, 2018 Share Posted July 8, 2018 To me, "clutch out" means the clutch is disengaged. I think you're saying it makes noise when the clutch is engaged, and the noise stops when the clutch is disengaged. That, plus popping out of gear, says to me that the synchronizers are shot. Possibly due to using the incorrect gear lube in the transmission. Unfortunately, the factory initially said to use GL-3, but GL-3 was replaced by succeeding numbers. GL-5, which is what's generally available, has a lot of sulpher. The sulpher attacks "yellow metal" (brass and bronze). Guess what the synchronizers are made of. Link to comment Share on other sites More sharing options...
cruiser54 Posted July 8, 2018 Share Posted July 8, 2018 Check the fluid level and condition. Link to comment Share on other sites More sharing options...
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