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Old 03-14-2020, 09:00 PM   #1
1960chevypanel
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3-on-the-tree trans synchronized?

Does anyone know what year they started synchronizing 3-speed transmissions? Working on a 1966.

Last edited by 1960chevypanel; 03-15-2020 at 03:20 PM.
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Old 03-14-2020, 09:17 PM   #2
cru_zn_29
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Re: Is 3-on-the-tree trans synchronized?

I think 1966 or 1967.
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Old 03-15-2020, 03:20 PM   #3
1960chevypanel
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Re: Is 3-on-the-tree trans synchronized?

Digging a bit more, main case says 3743368. Trans probably not original to truck. Hard finding reliable info but Google says 1958-1963 and might be a Corvette trans. Part of date code is obliterated but looks like K259 so 11/25/1959? I guess not synchro given the year.. Here's a pic:
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Last edited by 1960chevypanel; 03-15-2020 at 03:31 PM.
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Old 03-15-2020, 03:31 PM   #4
geezer#99
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Re: Is 3-on-the-tree trans synchronized?

It’s a non synchro Muncie sm318.
They were stock until 68.
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Old 03-16-2020, 09:00 AM   #5
MikeN
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Re: Is 3-on-the-tree trans synchronized?

The smaller, four-bolt-cover transmissions (as pictured above) are non-synchro on 1st, synchronized on 2nd and 3rd.

The later/larger 3-speed with seven-bolt side cover is fully synchronized.
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Old 03-16-2020, 02:57 PM   #6
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Re: Is 3-on-the-tree trans synchronized?

built 66-85
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1961 chevy K10

my build is------------61K10 build
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Old 03-16-2020, 04:53 PM   #7
1960chevypanel
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Re: Is 3-on-the-tree trans synchronized?

Awesome, thanks guys
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