Bronco Forum - Full Size Ford Bronco Forum banner

1 - 20 of 20 Posts

·
Registered
Joined
·
11 Posts
Discussion Starter #1
Hope someone might be able to help with a vibration problem. My truck does not always vibrate, but sometimes it does whenever I drive above 62 miles per hour. I can't tell where it comes from, and I've changed wheel bearings, new tires (not cupped), new u-joints, new rotors, and replaced the radius arm bushings. The vibration is not in the steering wheel, and the seats get a lot of the movement. Thanks for your help...
 

·
Registered
Joined
·
131 Posts
had the same problem, it ended up to be my rear drive shaft, bad u-joints and out of balance. hope this helps. take it off and bring it to an axle shop that has a balancer.
 

·
Registered
Joined
·
11 Posts
Discussion Starter #3
u-joints..drive shaft

Well, that was not the problem. I took the driveshaft assembly to a'universal joint specialist' in Ft. Smith, and he told me everything looked good and was not out of balance, So, I'm back to the beginning..again. Thanks for the advice.
 

·
Registered
Joined
·
158 Posts
My vibration was my torque convertor slipping which in turn burnt up my transmission.Got a aamco around? Go to their website and print off the coupon for a free transmission check they will pull any codes too wont cost you anything it`s worth a shot. My t/q had blue marks on it so if you want to pull the pan and change your filter might wanna look at that while your there.There`s better places than aamco I am just suggesting to let the pull your codes etc.
 

·
But what does mine say?
Joined
·
954 Posts
I've posted on this topic at least twice. Do a search and you will find several possible causes.
 

·
Something Spiffy
Joined
·
940 Posts
its probably pinon bearings, mine is doing it too, it also did it on my last axle that i had under the truck and that was the problem, if theres a ring and pinon shop around i say take it to them soo they can conferm what it is. they probably will just charge you for the price of oil that it takes to fill it back up with.
 

·
Registered
Joined
·
17 Posts
mine was doing something very similar and it ended up being a worn pitman arm. this allowed my front wheels to wiggle back and forth under speed.
 

·
Registered
Joined
·
11 Posts
Discussion Starter #8
differential

While reattaching the drive shaft to the differential, I noticed about a 5/16 play in the rear end. The way I found this was by grasping the flange on the diff and trying to turn it back and forth like a steering wheel..and it did. Now, what would be considered too much play, and any suggestions would be appreciated. BTW..the nut was tight.
 

·
Registered
Joined
·
203 Posts
BTTT

I have been having the same issues in my 86 w302, manual 4 speed with 9" rear. I have searched all over this web site and it seems like it is probably going to end up being the rear diff. The threads I have found have TONS of suggestions, but I have yet to see one where the original poster says: "Hey everyone, I did this and that and it worked"...

MY vibration starts at 70, gets read bad at 75, calms back down to practically nothing at 80. It sucks because, traffic to work is at exactly 75, so I have to either drive like a grandma at 60-65 or like a maniac at 85+. I saw a couple threads where the whole dang axle shaft detaches wheel and all while driving 70+ and that really freaks me out. I want to solve this issue.

I checked all my wheel bearings, my u-joints (I removed the rear drive shaft and drove on the freeway with ONLY my front wheels driving the bronco to rule out the bad u-joints in the back) and my radius arm bushings. The steering does have some slop and could use a full blown overhaul, but I don't think it is causing this particular issue.

Anyway, sorry this was long winded, but I am chasing the same ghost. I suppose it's time to hit up a driveline shop

:shrug
 

·
Registered
Joined
·
262 Posts
Not to thread jack but where did you find the socket to remove the drive shaft? It is a 12 point external torx right? I went everywhere with no luck.

Tim
 

·
Registered
Joined
·
432 Posts
If the vibration is in the seat of your pants more or less chack to see if the rear tires are out of balance may be you slung a weight. move the rear tires up to the front and see if the vibration moves to the steering wheel if so it is your tires....just a thought.
 

·
Registered
Joined
·
203 Posts
That's a good suggestion and all, but do you think an out of balance tire would cause the truck to vibrate like it was the space shuttle, reentering the atmosphere?

:D
 

·
Registered
Joined
·
262 Posts
Couldn't the tires be slightly out of balance....just enough to cause the problem? Maybe one of the smaller weights fell of?

Tim
 

·
negative creep
Joined
·
8,651 Posts
are you running lift blocks? those could also cause a vibration, or so i've heard and thats what it seems like on mine.
 

·
Registered
Joined
·
432 Posts
JustinC said:
That's a good suggestion and all, but do you think an out of balance tire would cause the truck to vibrate like it was the space shuttle, reentering the atmosphere?

:D
I have had vibrations i could barely feel if it is just a little out of balance but i have also felt like the whole truck is gonna vibrate apart if it is bad out of balance especially if you have large tires.
 

·
Registered
Joined
·
787 Posts
I had a really annoying vibration coming from the rear, and I went through everything trying to find it.

I balanced the driveshaft, the tires (twice at 2 different shops), swapped driveshafts, changed my rear shocks, and in the end it turned out to be belt separation on one of my rear tires.

Eventhough they were balanced one was ever so slightly out of round because a belt had shifted in the tire.

I finally found this by putting the rear up on jack stands and having a friend bring it up to 64 mph where my vibration was the worst. While looking around for the cause of the vibration I looked closely at the outer edge of the tire while it was spinning, and immediately saw the bad tire.

I bougt new tires, and she's now smooth as glass.
 

·
Registered
Joined
·
11 Posts
Discussion Starter #18
torx???

The bolts are not Torx..12 point 12mm. BTW, my problem was a cupped left rear tire. Bought 2 new tires and the problem disappeared. Thanks for the replies.
 

·
Registered
Joined
·
787 Posts
That's odd... In your forst post you said this"
My truck does not always vibrate, but sometimes it does whenever I drive above 62 miles per hour. I can't tell where it comes from, and I've changed wheel bearings, new tires (not cupped),

Then you said:
my problem was a cupped left rear tire. Bought 2 new tires and the problem disappeared.
:banghead


.... and people ask me why I drink :shrug

Oh well.. Glad ya got it fixed! :beer

-Paul
 

·
Registered
Joined
·
11 Posts
Discussion Starter #20
cupped tires..

I was referring to front end repairs at that particular point. Other than shocks I hadn't focused on the rear end too much.

The tires were taken off the front and put on the rear about a month ago. The new ones were installed on the front-end. Funny thing is, the problem existed before I bought new tires the first time. Anyway, $510.00 worth of new tires fixed the problem.
 
1 - 20 of 20 Posts
Top