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Labor Day Putting down your wrenches or time for
MORE wrenching? 
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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: Jun 2012 Posts: 1,747 'Bolter | | 'Bolter Joined: Jun 2012 Posts: 1,747 | What I think: Bad bearings in a sm420 4 speed. What I have: Stock 52 1/2 ton with a 4 speed and stock torque tube rear end. What I have done: Cleaned about 20 pounds of dirt from the trans, replaced the transmission fluid, Rebuilt the rear trans mount. What I have is a LOT of loose in the drive line, and a LOT of whine in all gears. Now I have a vibration under moderate load at about 35-40 MPH. Wheels and tires are balanced. Where to start looking for my trouble? Inside the ball and torque tube, U joint? Inside the trans? Or in the diff? I do have another trans if I need it...but that sucker is heavy and awkward to move around. I can do it but I don't want to if I don't need to. Any suggestions or should I just start and see what I have?
Steve H
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