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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: Feb 2007 Posts: 8 New Guy | | New Guy Joined: Feb 2007 Posts: 8 | Trying to resolve a 45-50 mph vibration in my '60 with an sm420.. Removed the driveshaft to rule it out, and the vibration occurs in exactly the same way: in 4th gear at 45-50 mph. Don't suspect motor or clutch since thi only occurs in 4th. Transmission is not original to the motor (283). Replaced a very tired 3spd.
Any suggestions would be appreciated. Headed towards either a full rebuild kit, or finding another trans, but hoping I can find out what is wrong and save some money.
49 GMC 1/2ton (Work in progress)
66 Chevy II (Better than New)
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