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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!
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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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