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Old December 15th, 2022, 12:06 PM
George Bongert George Bongert is offline
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Join Date: Jan 2013
Location: Oshkosh Wisconsin
Truck: Former owner Repowered by GMC 305 V-6, 1963 Chevy 30 Series SM420 Long Bed (9') Step/Fenderside
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Default Re: '66 1500 slipping out of second gear

Quote:
Originally Posted by Harleyq View Post
Looking at past threads, I can only assume I have a bad synchro. Just how tragic is this, and what is the difficulty rating between I got this and oh s#%* what have I done. Fairly well experienced with fixin' and rebuildin', just haven't had the mispleasure of having to break one of these trannys open. Any advice, warning, or cautionary tales would be greatly appreciated. Thanks, Dastardly Dave

Greetings Dave!

I take it your tranny is a SM318 three speed. This is a very simple transmission, and repairs are pretty straight forward. Anyone with a degree of mechanical acumen can fix one of these transmissions. The SM420 four speed is just as easy to fix except for the fact that it is bulkier, heavier, and more clumsy to work with. And to answer your question, your diagnosis of a bad snychro would be pretty accurate. It's not really tragic, it's just an annoyance of popping out of second gear.
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