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#1474428 Tue Nov 08 2022 05:35 PM
Joined: Jan 2016
Posts: 950
I can't tell if the issues is tires, suspension or my driveline. I have been test driving my new 47 project truck after it has being off the road for over 20 years. It is now running good. Engine, clutch and 3 speed transmission all seem good. Here is what I need some help with. i am not sure what to check. While going down the road the truck seems to run fairly smooth. When I am either decelerating or just push the clutch in there is very noticeable high speed vibration. The second the clutch engages it stops unless I am braking with the engine. If that is the case I notice it but not as much as just coasting with the clutch in. My first thought was an out of balance wheel but the fact it seems tied to what is going on with the driveline has me baffled.

Last edited by dgrinnan; Tue Nov 08 2022 05:42 PM.

Dave from Northern Kentucky
My 54 3100
dgrinnan #1474443 Tue Nov 08 2022 08:39 PM
Joined: Mar 2004
Posts: 5,836
If depressing the clutch makes the vibration come and go then it's not the tires.

What make and model is your '47?

Mike B smile

dgrinnan #1474467 Tue Nov 08 2022 10:42 PM
Joined: Feb 2021
Posts: 47
Does that year truck have a carrier bearing between the transmission and differential?

dgrinnan #1474512 Wed Nov 09 2022 01:28 PM
Joined: Jan 2016
Posts: 950
It does not have a carrier bearing. 1/2 ton

Last edited by dgrinnan; Thu Nov 10 2022 01:52 PM.

Dave from Northern Kentucky
My 54 3100
dgrinnan #1474839 Fri Nov 11 2022 12:50 PM
Joined: Jan 2016
Posts: 950
I can't seem to pin this down. I guess my next step is to check the rear end. Not sure what to look for. I hope I know it when I see it.

Dave from Northern Kentucky
My 54 3100
dgrinnan #1474840 Fri Nov 11 2022 01:03 PM
Joined: Nov 2021
Posts: 425
I would guess one of the u-joints has some play and when the drive load is removed it can shift around, under decelleratoin with the clutch engaged it shifts out of position but doesn't shift around.

1949/50 3600 Project
dgrinnan #1474843 Fri Nov 11 2022 01:45 PM
Joined: Mar 2007
Posts: 1,952
Crusty Old Sarge
I would place the truck on stands and run the drivetrain. With a hand from someone else you could engage and disengage the clutch while watching the driveshaft and ujoints, you can also check the rear end.


Come, Bleed or Blister something has got to give!!!
'59 Apache 31, 327 V8 (0.030 over), Muncie M20 4 Speed, GM 10 Bolt Rear... long term project (30 years and counting)

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