6066 (1960-1966) GMC Truck Club - Occasional slip out of 4th gear

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- - Occasional slip out of 4th gear (https://6066gmcclub.com/showthread.php?t=50980)

Robert B.

November 9th, 2020 04:42 PM

Occasional slip out of 4th gear

‘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

November 11th, 2020 09:05 PM

Re: Occasional slip out of 4th gear

Usually a sign of a bad Synchro.

Robert B.

November 11th, 2020 09:09 PM

Re: Occasional slip out of 4th gear

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

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