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Click on image for the lowdown. 
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| | Forums66 Topics128,052 Posts1,055,727 Members48,426 | | Most Online14,466
Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
Lots of work on Brad's part ... pure enjoyment (and references) for you!
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| THANKS!
For helping keep this great
old truck web site
on the Internet for over 30 years! and not clogged down
with Ads!  Again, thanks!
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| | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | The overdrive as used by GM was only used with their own transmissions, they did not offer it with the HD Borg-Warner trans. '55-'66(?) would be the SM318/319 non-syncro first gear, later ones used the SM326 sith the syncronised first gear.
Bill Burmeister
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