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1948 - 1956 F1, F100 & Larger F-Series Trucks Discuss the Fat Fendered and Classic Ford Trucks

Vibration help needed

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Old Mar 28, 2019 | 08:03 PM
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Vibration help needed

1951 f1, just replace rear motor mount and have bad vibration just before I shift into 2nd and 3rd. Also at 40 mph and above. Any help?
 
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Old Mar 29, 2019 | 08:43 AM
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Do you mean the transmission mount? Check to see it's seated properly and the drive shaft / U joints are in good shape.
 
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Old Mar 29, 2019 | 10:57 AM
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Originally Posted by Dohara
1951 f1, just replace rear motor mount and have bad vibration just before I shift into 2nd and 3rd. Also at 40 mph and above. Any help?
ok will double ck the trans mount - after the vibration I had 2 new u-joints installed and had the drive shaft balanced
 
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Old Mar 29, 2019 | 11:11 AM
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So are you saying that the vibration started after the new driveshaft was worked on? I would have the shop recheck their work, you should also check the driveshaft phasing.
 
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Old Mar 29, 2019 | 02:52 PM
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No it started after new trans mount install- we thought maybe in drive shaft so sent it to get balance and have both u joints replaced
 
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Old Mar 29, 2019 | 03:23 PM
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New trans mount same size as the old one? Pinion angle within specs?
 
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Old Mar 29, 2019 | 05:39 PM
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mount was same bought it from Dennis Carpenter- as soon as I drove after new mount that’s when vibration started. Took to work my guy thought maybe u joints and or needed to drive shaft re balanced-which I did - then went to install the shaft and the yoke was too short - so had them install a longer yoke . Vibration happens just before I go into 2nd and 3rd and then starts around 40 mph . My cell is 336-408-6800
 
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Old Mar 29, 2019 | 07:46 PM
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I have a 52, and replaced the mushy stock mount with a DC mount (made in India). It is as hard as rock. Ever since I have felt a lot more vibration than I think is appropriate. Don't know what we can do, not sure I'd trust an OEM that's been on the shelf for 30 years.
 
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Old Mar 29, 2019 | 08:08 PM
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my vibration is really bad can’t drive on highway
 
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Old Mar 30, 2019 | 07:06 AM
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Not a expert but from what you say it sounds like a engine RPM thing?? If you say it does it at the top of 1st and 2nd gears then in 3rd gear at higher RPM? If you have a tach or can tell by sound that the vibration occurs at a certain engine speed then I would look at engine/flywheel/ clutch/input shaft in trans,etc. If you engine isn't firing evenly on all 8 it can cause quite a vibration with a stick shift. Can you get the vibration to come on if you slowly rev up the engine in neutral? Good luck!
 
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Old Mar 30, 2019 | 07:14 AM
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Obviously, if the mount is correct and correctly installed you would not have need to lengthen the yoke.
Sounds like the drive line angle is wrong at the rear of the trans.
you answered your own question, it had no vibration before you changed the mount, so the mount or the install is wrong
 
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Old Mar 30, 2019 | 08:09 AM
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yes I will also vibrate in neutral when pressing the gas . All this started after replacing the trans mount
 
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Old Mar 30, 2019 | 10:16 AM
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Originally Posted by Dohara
yes I will also vibrate in neutral when pressing the gas . All this started after replacing the trans mount
If this is the case, then the driveline assembly is not causing it. The vibration may be caused by something between the back of the engine and the front of the transmission.
You should check the clutch assembly and flywheel. Possibly something is coming loose there. The engine firing order should also be verified, as it can run out of order, but will vibrate badly.
http://www.vanpeltsales.com/FH_web/F...ng_49-53v8.jpg
 
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Old Mar 30, 2019 | 10:21 AM
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Originally Posted by Rust Wrangler
If this is the case, then the driveline assembly is not causing it. ...The engine firing order should also be verified, as it can run out of order, but will vibrate badly.
http://www.vanpeltsales.com/FH_web/F...ng_49-53v8.jpg
Spot on! I would add, the radiator fan and front motor mounts are suspect. Unless the clutch was touched during the rear mount work, doesn't seem that would be the problem.
 
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