Vibration Problems
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New User
Joined: Jan 2002
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From: McDonough USA
Vibration Problems
I've got another post, but I've got two problems. When you hit 60 mph in my 96 Bronco, you are almost vibrated out of the truck (like you're doing 60 down a gravel road). When I first bought the truck it had cupped tires, which several mechanics told me was due to them not being rotated. After a while, I bought new tires. It helped ever so little, but the vibration was still there. After putting about 3,000 or so miles on them it is like it was. These tires are not cupped yet however. I've asked a thousand people and they all tell me it has to be the tires, but I'm not so sure. Any help?
Senior User
Joined: Jul 2001
Posts: 237
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From: Clearwater USA
Vibration Problems
How do you feel the vibration? Seat of your pants probably tires through the steering wheel something in the front end. My truck has a bad vibration at 50 and up and this is due to the aluminum wheels being bent the have a slight wobble that shows up at speeds. Might have them check yours. And if my memory serves me right cupped tires are caused by bad shocks I may be wrong. But, bad shocks can cause a vibration this also might be worth a check. Hope this helps some,
Rick
86 302 EFI, bored 60 over, AOD,
Headman Headers, Flowmaster 40 series,
2 inch dual exhaust, MSD ignition
Rick
86 302 EFI, bored 60 over, AOD,
Headman Headers, Flowmaster 40 series,
2 inch dual exhaust, MSD ignition
New User
Joined: Jun 2002
Posts: 8
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Vibration Problems
I had this same problem with my 96 bronco, when I bought it the tires were bald and it seemed to ride OK, after having new tires put on, it rode fine for while but then tires began to get cupped and it just vibrated like a mother. I took it in for an alignment and they told me my tires were bad and to take them back, but they also said my radius arm bushings were bad. I checked them myself and the drivers side bushing did look bad so I had them replace it, then I rotated my tires. That was 4 months ago and there is no sign of the tires even beginning to get cupped and the steering felt much more responsive immediatly. The drivers side bushing seems to be a common problem, I had 91 f150 which was the same way.
Senior User
Joined: Apr 2002
Posts: 406
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From: cedar rapids usa
Vibration Problems
I feel PJ is correct here. When the radius bushings go bye-bye they let the front axle twist upon the vertical center axis. This leads to a condition called “dog tracking”. Ever see a dog try and run side ways? This is what’s happening to your truck.
The one side is set back just a little bit more then the other, forcing your axle out of alignment. The side that set back will be dragged by the good side and this sideways force is what makes the tires cup. I bet you can guess by now what’s making the vibration, huh uh it’s the cupping of the tires.
I just replaced mine (did them only 3 hours ago) and it only cost me 8.95 for the polyurethane lifetime warranty set at AutoZone. The whole job only took my son and myself 20 minutes, including rotating the tires (God I love air tools). If you don’t have a son mine is for rent, CHEAP! Sorry though, you can’t borrow my air tools.
The one side is set back just a little bit more then the other, forcing your axle out of alignment. The side that set back will be dragged by the good side and this sideways force is what makes the tires cup. I bet you can guess by now what’s making the vibration, huh uh it’s the cupping of the tires.
I just replaced mine (did them only 3 hours ago) and it only cost me 8.95 for the polyurethane lifetime warranty set at AutoZone. The whole job only took my son and myself 20 minutes, including rotating the tires (God I love air tools). If you don’t have a son mine is for rent, CHEAP! Sorry though, you can’t borrow my air tools.
New User
Joined: Jun 2002
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Vibration Problems
Check your wheels. Worn lug holes made my Bronco vibrate terribly past 60 mph. Fought the issue for a long time. Balancing the tires did nothing. New tires did nothing. New wheels solved the problem.
FYI, I also discovered that replacing the door strike bolts (old ones had plastic sleeves breaking apart) reduced outside noise a lot. You'll see what I'm talking about if you look at yours. A minor repositioning made a world of difference in wind/road noise.
Rex
FYI, I also discovered that replacing the door strike bolts (old ones had plastic sleeves breaking apart) reduced outside noise a lot. You'll see what I'm talking about if you look at yours. A minor repositioning made a world of difference in wind/road noise.
Rex
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Freshman User
Joined: Nov 2001
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Vibration Problems
Same Speeds as my 88 had a vibration that sounded like the it was going to explode just any time. Did tires, shocks, raidus arm bushings, and still had the vibration. Could feel it in the whole truck. It cane up to be that the yoke on the rear axle was loose at the u-joint. Tightened it up and didn't have any more vibration. If that is the problem you can tell by the up,down,and side to side motion. Good luck with it.
CJ
CJ
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Freshman User
Joined: May 2002
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From: Atlanta USA
Vibration Problems
Having the same problem in my 88 too. I tend to aggree with the last post about the yokes. However, someone else posted here a few months ago saying that it could be the double cardan joint centering bearing. Napa part #612 for $27. I think that is what is wrong with mine but havent had a chance to change it. May want to redo all u joints and get the shaft balanced too.
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From: McDonough USA
Vibration Problems
I checked the rear yolk to see if it was loose and it wasn't. I also checked one of the wheels to see if the lug hole are worn, but on that one they aren't. Unfortunately I had to go to work and didn't get to check the rest. I will try to do that this weekend. Where on the truck is the double cardan joint? Any other suggestions?
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Joined: Jul 2002
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From: The Rock, BC
Vibration Problems
The Dual cardan is on the rear driveshaft at the transfer end .. it is essentially two U-Joints held in place by an H-Yoke and aligned with a centering yoke. if the centering stud is worn it'll wobble. the center stud usually wears down due to lack of lube to the center bearings ... it's a quite well hidden flush nipple inside the CV that needs to be lubed.
another possible source of vibrations can come from a worn out slip shaft on the rear driveshaft. place the truck in neutral and try to wiglle the slip shaft, if it moves it's worn out. just fixed all these problems on my old 81
Dave
another possible source of vibrations can come from a worn out slip shaft on the rear driveshaft. place the truck in neutral and try to wiglle the slip shaft, if it moves it's worn out. just fixed all these problems on my old 81
Dave
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Joined: Jun 2002
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From: Salt Lake
Vibration Problems
I had the u-joints to the rear axle lock up and do the same thing, the didn't feel loose either, they were just locked up. It only vibrated after I hit about 40 mph. I replaced them with some that had grease fittings and have not had that problem since (just a hundred different problems. . .)
Junior User
Joined: Mar 2002
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Vibration Problems
You say you had new tires put on?
Did you watch when the vehicle was lifted?
On an older vehicle I own, the tire guys, I mean
Idiots bent my drive shaft when the hoist went up
because part of the lift pushed on the D/S and bent it just slightly.
The results of their mis-deed wasn't apparent at low speeds. just after 60
it vibrated like hell! Like running down a harden washboard riverbed at 50+.
I had to replace it with a re-man unit from a specialty shop in city of commerce.
Can't remember the cost, but if you go for a salvage yard unit, you may get a bent one.
The re-man unit is guaranteed to be balanced and straight.
Ron
Did you watch when the vehicle was lifted?
On an older vehicle I own, the tire guys, I mean
Idiots bent my drive shaft when the hoist went up
because part of the lift pushed on the D/S and bent it just slightly.
The results of their mis-deed wasn't apparent at low speeds. just after 60
it vibrated like hell! Like running down a harden washboard riverbed at 50+.
I had to replace it with a re-man unit from a specialty shop in city of commerce.
Can't remember the cost, but if you go for a salvage yard unit, you may get a bent one.
The re-man unit is guaranteed to be balanced and straight.
Ron
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