extreme vibration
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Elder User
Joined: Nov 2009
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extreme vibration
So i have a vibration in my 94 that i cannot find and am hoping it is not in the tranny. Anyway at 35mph if you are just coasting or just into the throttle enough to mantain speed it will start shaking the whole truck terribly. As soon as you give it enough gas to pick up speed it is gone and drives perfect. This truck does this same thing at 55mph. I have changed the u-joints in the rear drive line. The u-joint coming out of the transfer case feels soild. Could a frozen u-joint at the t-case cause this? It does this in 2wd, 4wd and 2wd with hubs locked in. Also one more thing. The 4X4 light is stuck on could this be linked to anything?
Tuned
Joined: Feb 2004
Posts: 343
Likes: 30
From: Maryville, TN
I'm might be experiencing the same thing......not violent though but very noticeable. It's not an up/down shake like a tire but a forward/backward, if that makes sense. I doubt it's a u-joint as they are worst under load. You mention 2 speeds, I'm not sure of the speeds on mine but it occurs in both 3rd lock and 4th lock (E40D) at exactly the same RPM. Up or down even just a smidge and it's gone.
I only feel it during moderate acceleration, not coasting. Under heavy acceleration I think I pass over the shake RPM to quickly for it to be noticeable.
Does this sound similar?
I only feel it during moderate acceleration, not coasting. Under heavy acceleration I think I pass over the shake RPM to quickly for it to be noticeable.
Does this sound similar?
Postmaster
Joined: Apr 2009
Posts: 4,086
Likes: 1
From: Malahat/Cowichan Valley
check your transmission mount and if you have the two piece driveline, check/replace the steady joint. if its worn out, it will shake a lot. Its design is to steady and hold the driveline in place and absorb the vibration. If you dont have the two piece then it is probably the driveline itself, the trans mount, or possibly loose/worn yoke on the rear diff.
Fleet Mechanic
Joined: Nov 2010
Posts: 1,347
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From: Kville, ohio
how bout tires, i guess it would be possible that you threw a weight. not likely but entiraly possible. how bout snow or mud packed in a rim. also check your hubs, make sure theres no play in the wheel bearings. your hitting a harmonic somewhere in driveline. also your driveshaft could be out of balence. did it start before or after you did u joints.
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Elder User
Joined: Nov 2009
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so here is what i have found out. Rear Yoke is Done, the steady point is shot, i can move the driveline up and down 3/4in without even trying. I am in the process of swaping right now with my parts truck. I got the nut off the rear yoke and thought those just slid right out. Am i missing something or do i need to beat the yoke out.
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Elder User
Joined: Aug 2008
Posts: 821
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From: 50450 IOWA
i had something kinda like this the other day but it would do it in park also, i had alot of snow/ice around the transfercase. i could feel the vibration under my feet kinda up the firewall.
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Post Fiend
Joined: Jan 2005
Posts: 8,402
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https://www.ford-trucks.com/forums/9...r-bearing.html Have a read here. Probably best to take it to a shop and have it pressed off and the new one pressed on.
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Elder User
Joined: Nov 2009
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Ya i am going to take it to a shop. I called them and they said $35. In my opinon that is pretty tough to beat when i know i would fight it and fight it, wasting a whole day and then taking it to them anyway. On my yoke on the rear diff on of the tabs that holds the u-joint centered is almost go. I took the nut off but cant get the yoke out. Is there a trick or do i need a puller or some specialty tool for this.
Post Fiend
Joined: Feb 2009
Posts: 8,005
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From: Ottawa, Ontario
I noticed this summer something similar in my motorhome, it would only do it at speeds over 70mph!
The driver side front tire would start bouncing up and down very quick and very violently! It's well balanced and everything. I never bothered it much, since it's really rare I'll go over 60 in the camper anyways, but still, now that i'm thinking of it, I'm wondering what the heck can it be?
Nothing is loose in the front end.
The driver side front tire would start bouncing up and down very quick and very violently! It's well balanced and everything. I never bothered it much, since it's really rare I'll go over 60 in the camper anyways, but still, now that i'm thinking of it, I'm wondering what the heck can it be?
Nothing is loose in the front end.
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Elder User
Joined: Nov 2009
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another question. With the driveshaft out the bearing spins very smooth and has no play. With the driveshaft in i can push it up about 3/4in. I think that just the rubber is bad. does this mean replace the carrier bearing or could all this vibration be coming from just the rear yoke
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
I think your problem is the carrier bearing and mount.
And when you replace it and put the drive shaft back in, use a string line to get it as straight as possible front to back.
Puller to get the rear yoke off unless it is well worn.
Someone may have put a little RTV on the shaft when it was installed for a better seal on the pinion shaft.
And when you replace it and put the drive shaft back in, use a string line to get it as straight as possible front to back.
Puller to get the rear yoke off unless it is well worn.
Someone may have put a little RTV on the shaft when it was installed for a better seal on the pinion shaft.