Occasional slip out of 4th gear

[Robert B.]

‘63 GMC 3/4t, 305E V6, 4-wheel drive, 4 on the floor, 511 front and rear (75k miles). On occasion, at cruise speed, the stick pops out of 4th gear to neutral. Any recommendations regarding diagnosis and fix? Thanks in advance guys!


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[BillT]

Usually a sign of a bad Synchro.

[Robert B.]

Super, thought that was a possibility, thanks Bill. Next level maintenance for me[emoji23]


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