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Old September 1st, 2018, 11:07 PM
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sclor sclor is offline
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Join Date: Jan 2013
Location: New Orleans, LA
Truck: 1966 GMC 1000 series fenderside
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Default Re: Overdrive 3 Speed

Dave:
I have the seven bolt side cover 3 speed with overdrive transmission. My tranny has synchronized first gear. I am running 3.54 rear end. Results in about 2000 rpm's at 60mph. I think it was one of the best upgrades I made. Parts are getting a bit hard to source, but so far I haven't needed anything since I installed it a few years ago. Hardest parts are electric solenoid and governor switch. My vote would be to go for it. I think it would cut your rpm's about 30% in overdrive.

Hope this helps. Manuals for tranny can be found online for free. Let me know if you are interested.
Regards
Steve
New Orleans
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