Bronco vibration

R

Rich in AZ

New member
Hopefully someone has experienced this problem and can clue me. My 93 Bronco has developed a heavy vibration that feels like it is coming from the rear and begins under accelleration at around 35 mph and increases with speed. The vibration stops when I let off the accellerator and begins again when I give it gas. Drive shaft and universals are fairly new and tight. The right rear tire has considerably more wear than the left rear. Any ideas?
 
Rich Thats got to be driveline related,it almost has to be Ujoint driveshaft or pinion..I have put new joints in that were bad. Better check and see if you have a tight bearing cap on one of the joints or a loose pinion bearing.
 
Even though it feels like it is in the rear you might want to check the ujoints on the front axle shaft. I just got done replacing one and feels like maybel the other one is bad. You might also jack it up and try to see if there is any up and down movement on the rear wheel to make sure you dont have a bad wheel bearing. Also look for any gear lube leaking out of the back of the rear brake drum.
 
Are the new universals tight, as in real tight? You don't want to crush the end caps when installing them. Just tighten the bolts down until they are firm.
 
I had this problem once and thought it was in the driveline but come to find out it was my fan clutch.The bearings went out and the fan was off its axis causing the vibration.New clutch fan and the vibration was gone.
 
Thank you, Gentlemen. I do appreciate the help. I had climbed under and tried to move the driveshaft and it was solid. After your suggestions I got the rear tires off the ground and climbed under again. Now there was considerable play in the rear u-joint. After removing the sheep wool from the joint I could see that one of the cups had failed. It was installed by a pro about 20k miles ago. Double cardan drive so they have to be pressed in and out.
Thanks Guys.
 
This is not your problem but it happened to me and I have a need to rat on myself. I replaced the U-joints on my Bronco a couple months ago, everything was fine for about a month. That is until the truck started to vibrate in a manner that I've never seen before. Not a typical U-joint growl, but a steady buzzy vibration. After checking everything else, as a last resort, I jacked the truck up and set her on jack stands. Then gently put her in gear. With the wheels spinning I looked under the truck. The driveshaft was deffinately whipping a bit. Sheepishly admitted that it was a blown the U-joint install. Under the truck I go, wrench in hand. When I set the wrench over one of the front driveshaft bolts the darned thing TURNED almost all by itself. OOooops! I'd only finger tightened the front bolts.

My excuse, I did the U-joints at the very tired end of a full 6 shock, front break rotor-break shoe-bearing maintenance, heater core replacement job. No wonder the truck vibrated. All in all an easy fix though. I still feel like an idiot though.
 
Well, if it's a bad U-joint that ails your Bronco, you can always bring it to the next PM hunt and we can change it in the hotel parking lot /ubbthreads/images/graemlins/laugh.gif
 
Quote:
Yeah, thats all he needs. A bunch of drunks working on the bronco.



Hey now, I resemble that remark! Anybody who knows anything about working on trucks knows that beer and wrenchin' go hand in hand. In fact, I am surprised that Sears doesn't have an add-on mini-fridge for their Craftsman tool chest line.

Many times I rate the complexity of a project in beers consumed. It works like this: Count the number of beers consumed (minus the first and the last) to complete the project. An oil change, for example, has a beer complexity factor of 2 as a typical oil change is as follows: Crack open a beer. Open a beer and start looking around for your drain pan, filter wrench, creeper, filter, and oil. Drink second beer while fluid is draining and third beer while adding oil. Put tools away and have fourth beer. With my F-350 though I tend to need to pick up a 12 pack as it takes a while to wait for 15 quarts to drain and then add in like amount.
 
Quote:
In fact, I am surprised that Sears doesn't have an add-on mini-fridge for their Craftsman tool chest line



ha ha
I got that beat. I had a guy make a gun vise for me to clean my guns. I had him build a cupholder into it. /ubbthreads/images/graemlins/ooo.gif /ubbthreads/images/graemlins/ooo.gif /ubbthreads/images/graemlins/grinning-smiley-003.gif

Course I don't drink much anymore so it is usually coffee or water in the cupholder.
 


Write your reply...
Back
Top