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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: Jan 2008 Posts: 4,961 'Bolter | | 'Bolter Joined: Jan 2008 Posts: 4,961 | It sounds like you have a Timken/Rockwell 2 speed. They didn't use many of them. It makes no difference what truck they are in: Chevy Ford or whatever the shift motor will be the same if it is an old Timken two speed. I haven't seen one around in a long time. I think this old GMC has a Timken 2 speed, but it is vacuum shift. https://photos.app.goo.gl/fbkzM6kXvtsubGbb6I would consider replacing the entire rear axle with an Eaton Electric 2 Speed. Lots of old field trucks had them. Most Chev and GMC two tons used a vacuum two speed that left a lot to be desired. I think just all Ford, International and Dodge used an Eaton electric two speed. | | |
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