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Old 07-02-2010, 10:44 AM   #1
Touchdown67
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3 speed overdrive transmission questions?

I was wondering if 65-66 Chevy. C10 trucks had a factory 3 speed overdrive transmission option? How well did these transmissions perform? Does anyone have information on the operation of these, or one for sale?
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Old 07-02-2010, 10:57 AM   #2
NCD1966
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Re: 3 speed overdrive transmission questions?

I believe some did. I think they mostly came in the panel trucks. I talked to one guy and he had one in a early el camino. Its a Saginaw 3 speed with a borg warner overdrive. The overdrive activated by a switch and kicks in automatic. Some guys take the OD unit off and put them on a saginaw 4 speed.

I'm looking for one myself for my 66. I want to keep the 3 on the tree but have a overdrive for the highway.

I found a video of one
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1966 Chevy C10 Stepside 355ci sbc with 3speed OD
2021 GMC Sierra 1500 AT4 6.2
1980 Chevy Camaro z28 383ci
1990 Chevy Suburban 350 tbi 2x4 (sold)
1984 Chevy C10 sliverado short fleet
1997 Chevy C1500 short fleet

Last edited by NCD1966; 07-02-2010 at 10:58 AM.
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Old 07-02-2010, 11:30 AM   #3
Touchdown67
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Re: 3 speed overdrive transmission questions?

Wow thanks for the info. I have a 65 C10 with a 3 on the tree. I was thinking of the same set up as you are planning. I just saw a nice trans. sell on Ebay but i didn't know enough about them. Please keep in touch on your findings.
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Old 07-02-2010, 02:24 PM   #4
NCD1966
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Re: 3 speed overdrive transmission questions?

i found some on www.car-part.com

but coming out of a junk yard you really dont know what kind of shape its in.

Also I did some research on these transmissions a while back and one guy told me he put one in a chevelle with a very mild 454 and they ran it for years. So it looks like they with be able to hold a little power.

Also here is a page on a 1966 truck with a modded 283ci with a 3 speed od unit

http://www.customclassictrucks.com/f...kup/index.html
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1966 Chevy C10 Stepside 355ci sbc with 3speed OD
2021 GMC Sierra 1500 AT4 6.2
1980 Chevy Camaro z28 383ci
1990 Chevy Suburban 350 tbi 2x4 (sold)
1984 Chevy C10 sliverado short fleet
1997 Chevy C1500 short fleet
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