64 Cheyenne Posted July 14, 2013 Share Posted July 14, 2013 A friend swapped a JY AX-15 into his MJ. Now when he takes off in first, it pops out of gear, then if you hold it there it stays in gear when you try to take off again. If you go from Rev to 1st while still rolling it will stay in gear when you take off in 1st. If you put it into first while you are still rolling before coming to a stop at a light it stays in gear when you take off again. We drained all the oil, only about a quart in it, and refilled with 30 wt syn, all other gears shift fine. Bad first gear synchro? Link to comment Share on other sites More sharing options...
Eagle Posted July 14, 2013 Share Posted July 14, 2013 If it were a bad synchro, it would pop out any time you put load to it. Might be an internal adjustment, or it might be that your friend isn't shifting it fully into gear. Link to comment Share on other sites More sharing options...
64 Cheyenne Posted July 16, 2013 Author Share Posted July 16, 2013 Did a little more searching, general consensus is that there is movement in one of the shafts causing it to pop out of gear. I'm kind of leaning towards a bad input shaft bearing. Link to comment Share on other sites More sharing options...
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