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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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| | | | Joined: Dec 2007 Posts: 1 New Guy | | New Guy Joined: Dec 2007 Posts: 1 | I recently purchased a 1968 C10 with a 307 and 3 on the tree. The truck has electric overdrive that is currently not working. I have been searching for manuals or web pages, anything to help me get started or find parts to fix it. The previous owner told me that it was a bad solenoid at the rear of the tranny. So far I've had no luck finding any parts or even a diagram of this set up. Please steer me in the right direction! | | | | | Joined: Jul 2003 Posts: 252 Shop Shark | | Shop Shark Joined: Jul 2003 Posts: 252 | AFAIK, There are no replacement parts available, other than what you can scrounge in a salvage yard. Wiring diagram and other info can be found at.... www.hydratech.com/pctc/Public_Documents/bwwiring.pdfHope this helps! | | | | | Joined: Apr 2005 Posts: 2,098 'Bolter | | 'Bolter Joined: Apr 2005 Posts: 2,098 | The shop manual has trouble shooting info and a wiring diagram. You can dissassemble the solenoid and clean up the contacts. Many times the oil seal leaks and gets oil in the solenoid and causes it to short out. It can be cleaned up with solvent. The trans seal is available. Solenoids and original parts are hard to come by but many of us have found other components to replace the factory relays and kick down switches. There is a lot of info in this forum on overdrives.
Fred
1956 3100 Pickup/Red/350/3sp OD/PS/Disc Brakes
1957 Bel Air Sport Coupe/Red/355/TH350/PS/Disc Brakes
2017 Silverado LT Single Cab SB/Black/5.3/6 Speed Trans
1947 Willys CJ2A w/F-Head engine
| | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | To add the what Fred said, don't be afraid to look into other brands for parts, the same overdrive unit was used by AMC, ford, GM, and several others. The electrical and many internal components are the same, the adapter housing and input shaft being the main differences in application.
Bill Burmeister
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