Original Overdrive Help! - The 1947 - Present Chevrolet & GMC Truck Message Board Network

whatleyr · 07-27-2018, 01:45 PM

Hello all. I'm finally at a point where I can spend a few hours a day working on my 65 c10. I have never operated the overdrive on this truck.

Question: Should I do any maintenance to the transmission before trying to engage the overdrive? I know there are switches on the carburetor. How would I check these out?

Next Question: How in the name of Zeus' butt hole do I operate this overdrive? Thanks.

GASoline71 · 07-27-2018, 07:57 PM

Not sure of any "factory" overdrives from that era, so it was possibly an aftermarket deal. Or maybe even a dealer add on. Post up some pics will make it easier to identify.

Gary

**Chevy Fleetside** · 07-27-2018, 08:01 PM

There should be a cable to pull under the dash. After you pull the cable and over 55 MPH I believe the O/D will kick in if the servo's are connected. I put an O/D unit in my 65 and hooked up a switch to override the Servo switch. I just do it manually. So I have to pull the cable and flip the switch. The trans I used was from 1957 according to the #'s on the case.
This is what an O/D unit looks like. I had 3. I sold one and put on in my truck and this one is sitting in my garage. It needs a full rebuild.

slorio · 07-28-2018, 11:45 AM

Have a look on this website. They have the original manuals posted on 3speed overdrive transmissions.

Hope this helps.
Regards
Steve

http://devestechnet.com/Home

07-27-2018, 01:45 PM	#1
whatleyr Registered User Join Date: Mar 2015 Location: Lone Star, TX Posts: 26	Original Overdrive Help! Hello all. I'm finally at a point where I can spend a few hours a day working on my 65 c10. I have never operated the overdrive on this truck. Question: Should I do any maintenance to the transmission before trying to engage the overdrive? I know there are switches on the carburetor. How would I check these out? Next Question: How in the name of Zeus' butt hole do I operate this overdrive? Thanks.

07-27-2018, 08:01 PM	#3
Chevy Fleetside Registered User Join Date: Sep 2006 Location: San Francisco Posts: 4,782	Re: Original Overdrive Help! There should be a cable to pull under the dash. After you pull the cable and over 55 MPH I believe the O/D will kick in if the servo's are connected. I put an O/D unit in my 65 and hooked up a switch to override the Servo switch. I just do it manually. So I have to pull the cable and flip the switch. The trans I used was from 1957 according to the #'s on the case. This is what an O/D unit looks like. I had 3. I sold one and put on in my truck and this one is sitting in my garage. It needs a full rebuild. Attached Images __________________ "A man and his truck, what a beautiful thing" 65 Short Fleetside BBC 65 Long Fleetside 283 3 on the tree for now. my build thread http://www.67-72chevytrucks.com/vboa...d.php?t=259536

07-28-2018, 11:45 AM	#4
slorio Registered User Join Date: Sep 2006 Location: Louisiana Posts: 375	Re: Original Overdrive Help! Have a look on this website. They have the original manuals posted on 3speed overdrive transmissions. Hope this helps. Regards Steve http://devestechnet.com/Home

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