chuckl
Well Known Member
Occasionally, my M-21 Muncie will lock up in neutral and will not go into any gear. It usually happens at slow speed (or stopped), in parking lots, etc. Plus, I think it has a bit more of a whine now. It only has 350 miles on it since rebuild. It is Supercased and almost everything inside is new, including syncros (brass). The aligning slot/pin is right on. It was a bit stiff after overhaul, but seemed to work itself out to shift smooth. No leaks and no problems until the last couple of runs of 25-35 miles. I am using synthetic gear oil. Is the synthetic oil affecting the syncros? Any thoughts?