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1980 - 1986 Bullnose F100, F150 & Larger F-Series Trucks Discuss the Early Eighties Bullnose Ford Truck

vibration when pulling a load - automatic trans.

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Old Jan 20, 2008 | 11:50 PM
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vibration when pulling a load - automatic trans.

I bought an 86 f250. Just put a 93 7.3 non turbo in it. Pulled a trailer with a mini-van on it today and the engine/trans made a loud resonating vibration when climbing hills. Never heard/felt it before I had it loaded down. Could it be the 2 piece drive shaft or would it most likely be in the torque converter? Or am I clueless?

Thanks
 
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Old Jan 20, 2008 | 11:56 PM
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I would check all of your U-joints
 
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Old Jan 21, 2008 | 08:58 AM
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Having the load on the back could be changing the driveline angle to create the vibration. Could also be a bad carrier bearing is letting the shaft move under a load. Does it happen under hard acceleration too?
 
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Old Jan 21, 2008 | 12:20 PM
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Thanks for the replies. I drove it today and I am starting to hear/feel the vibration without a load. It will do it under hard acceleration.

Sycostang67, are you thinking carrier bearing?

This truck has been parked for a number of years evidently. King pins are stiff, brakes frozen when I got it etc... I've put around 1000 miles on it and things are beginning to happen like this.
 
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Old Jan 21, 2008 | 12:31 PM
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Nothing beats getting under there and shaking stuff around to see if there is play or slop in a u-joint, carrier bearing, rearend yoke loose, etc. It's best to block the wheels and put the driveline in neutral to take the strain off of it so you can check it.
 
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Old Jan 21, 2008 | 08:58 PM
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From: patricia ab canada
had the same problem on my 86 f250. turned out to be the u joints.it started small and got worse.replaced u joints and that cured the problem.
 
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Old Jan 22, 2008 | 09:56 AM
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It really sounds like it's driveline related. Dave is right though, you need to get under that thing and start shaking some parts.
 
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