shaking truck
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Fleet Mechanic
Joined: Nov 2000
Posts: 1,713
Likes: 2
From: In my House
shaking truck
Ok, I have a 96F150 4x4 reg cab, auto. I have a problem that feels like someone is shaking the whole truck from side to side at about 40-60mph. At 70 or above it's fine. I have had ball joints done, new rotors, bearings,all 4 tires rebalanced, front end alignment. What could I be missing? He did say that 2 of my wheels needed quite a bit of weight to balance them. But anyhow, I am at a loss of what to check next. I don't tow anything, I haul very rarely.
Thanks,
Rich
:-(
Thanks,
Rich
:-( 
Senior User
Joined: Oct 2001
Posts: 116
Likes: 0
From: Florida
shaking truck
I had a similar problem - turned out to be U-Joints. I could have swore it was in the front but the U-joint that finally went was all the way in the back at the rear end. I know you think I'm crazy but just pull into a tranny shop and have them take a look - most won't charge to check U-joints.
Senior User
Joined: Feb 2000
Posts: 482
Likes: 1
From: Connecticut
shaking truck
It could be a tire, sometimes the belts shift and the vehicle shakes side to side. Can you tell if it's coming from the front or rear? Rotate the tires front to rear, rear to front and see if the vibration follows one set or the other. Excessive wheel runout can also cause this. Has anyone hit a curb, rock or trail debris to possibly bend a rim?
Mark
Mark
New User
Joined: Apr 2002
Posts: 7
Likes: 0
From: Kickapoo u.s
shaking truck
Finally, I have found someone with the same problem I have. My '95 F150 extended 4X4 feels like the whole truck is vibrating underneath you. Only at those certain speeds and usually when the truck is already in a high gear. You can't tell if it coming from front, back or side to side. I have switched tires, wheels and had the whole front end inspected. The last guess I heard about this was that it might be the u-joints or the drive shaft itself.
Laughing Gas
Joined: Jul 2001
Posts: 1,019
Likes: 3
From: Bismarck, ND
shaking truck
I could be way off here, but I had an older Mustang to do the same once. At certain speeds I'd get a noticeable vibration, and I couldn't figure out what it was for the life of me. It turned out to be a bad tranny mount. No clunks or anything else obvious, just the vibration. That and your motor mounts may be worth taking a peek at, for what it's worth.
New User
Joined: Dec 2001
Posts: 10
Likes: 0
From: Des Moines
shaking truck
Had a similar problem on my '93 F-150. Balanced and rotated the tires a couple of times with no results. Ended up getting new tires and the problem disappeared. Seems the belts on one of the tires had separated due to an impact with a curb.
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Senior User
Joined: Apr 2003
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From: Fl
shaking truck
The U-joints are so cheap and easy to do you should do them, if you cannot verify their age or wear you need them. They do not have to make noise or vibration when going in or out of park but they can be responsible for a great deal of imbalance and if one ever breaks it will scare you have to death and facilitate either a wrecker or taking the driveshaft home to replace them and returning to put it into the vehicle. It's best to just do this at home now and know they are in good shape.
