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Jul 21st, 2025 | | | | Joined: Apr 2013 Posts: 67 Shop Shark | | Shop Shark Joined: Apr 2013 Posts: 67 | My '53 Chevy has this strong thumping vibration as I get into the 30-40mph in 4th gear.
I can't seem to get the truck to go over 42mph in 4th gear.
It gets worse when I let up on gas.
Is this a transmission problem? I have a floor shift 4 speed. The differential looks great. I re-did the drive shafts/universals.
Also - who made these 4 speeds?
This is a 53' truck with a 1961 235 - could it be a mounting problem with the older trans on newer 6?
Ron | | | | | Joined: Jan 2011 Posts: 305 'Bolter | | 'Bolter Joined: Jan 2011 Posts: 305 |
1963 c10
| | | | | Joined: May 2001 Posts: 7,440 Extreme Gabster | | Extreme Gabster Joined: May 2001 Posts: 7,440 | That would be my guess too. | | | | | Joined: May 2006 Posts: 8,351 'Bolter | | 'Bolter Joined: May 2006 Posts: 8,351 | Sounds like a tire problem to me as well. The speed issue is more likely a different problem, perhaps a mis-adjusted clutch. The transmissions were more or less the same for the 4 speed, that shouldn't be an issue. They were a GM produced transmission, manufactured at the Toledo Ohio plant.
Bill Burmeister
| | | | | Joined: Nov 2006 Posts: 2,544 Shop Shark | | Shop Shark Joined: Nov 2006 Posts: 2,544 | | | | | | Joined: Apr 2013 Posts: 67 Shop Shark | | Shop Shark Joined: Apr 2013 Posts: 67 | I was thinking tire also - however, vibration nearly stops on acceleration and suddenly increases in intensity when I let up on gas.
Seems like tire thumping would be related to
speed only? | | | | | Joined: Aug 2005 Posts: 6,383 Ex Hall Monitor | | Ex Hall Monitor Joined: Aug 2005 Posts: 6,383 | Does the thumping go away after a few miles? If not it's likely not a tire. Bias ply tires flat spot when they sit leading to a thumping ride on cold start. As the tires warm up the flat spot goes away.
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