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Unread 08-28-2011, 03:00 PM   #1
Darrin29
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1980 CJ5 
 
Join Date: Jun 2011
Location: Pensacola, Florida
Posts: 4
Rabid Vibrations!!

Im new to the site. have a question as im not much of a mechanic.
over the course of a couple days ive had a minor vibration turn into a violent one. Shook my mirror off! Where should I start? The vibration is load dependent. free wheel, no problem. I realize this is probably common knowledge to most. thanks for any help.

Darrin

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Unread 08-28-2011, 03:17 PM   #2
Mike Romain
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If it is not in the steering wheel, then I would be blocking the wheels, putting it in neutral and go under to shake and twist the rear driveshaft expecting to find slop at a u-joint.

If in the steering strong, then I would have someone turn the steering wheel side to side while I was under the front looking for a moving part that has slop or up and down movement.
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Unread 08-28-2011, 03:31 PM   #3
trj1393
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could it be the legendary Jeep Death Wobble???
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Unread 08-28-2011, 07:04 PM   #4
gojeepin
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Quote:
Originally Posted by Darrin29 View Post
Im new to the site. have a question as im not much of a mechanic.
over the course of a couple days ive had a minor vibration turn into a violent one. Shook my mirror off! Where should I start? The vibration is load dependent. free wheel, no problem. I realize this is probably common knowledge to most. thanks for any help.
Beside the info you gave us about it being load dependent, there are several things we need to know to help.
Does it occur at all speeds?
Do the wheels wobble?
Do you feel it in your seat/feet or is it in the steering column?
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Vibration? Bump steer? Wandering? Read: Steering, suspension, and driveline basics. An article on how it works and where to look for problems.

83 CJ7, 4.1L 6cyl (4.0L bored .030" over), 35" tires, T-5 transmission, Dana 300 TC, Trussed AMC 20.
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Unread 08-29-2011, 04:57 AM   #5
Darrin29
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1980 CJ5 
 
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Location: Pensacola, Florida
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Quote:
Originally Posted by gojeepin

Beside the info you gave us about it being load dependent, there are several things we need to know to help.
Does it occur at all speeds?
Do the wheels wobble?
Do you feel it in your seat/feet or is it in the steering column?
Hi and thanks. It is worse at 30-40 mph. Smooths a bit at higher speeds. I feel it in the steering column. The wheels don't wobble and when you let off the gas it stops.
Thanks guys
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Unread 08-29-2011, 06:00 AM   #6
gojeepin
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Are your front hubs unlocked?

It sounds like your front driveshaft... you don't have the transfer case in 4-wheel high do you?

BTW... my son's moving to Penscola in mid-September...
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Vibration? Bump steer? Wandering? Read: Steering, suspension, and driveline basics. An article on how it works and where to look for problems.

83 CJ7, 4.1L 6cyl (4.0L bored .030" over), 35" tires, T-5 transmission, Dana 300 TC, Trussed AMC 20.
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Unread 08-29-2011, 07:55 AM   #7
Darrin29
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No, hubs aren't locked. I'm gonna have someone look at it for me today. Tell your son to hit me up when he gets here. Few good jeep spots around.
Bogs and boulders. Great park about an hour away. Look at the website.
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Unread 08-29-2011, 08:23 AM   #8
zeronight
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Take a look at this . i had vibes just like your describing and here is what i did to fix it.
good luck

http://www.jeepforum.com/forum/f8/da...-yoke-1244355/
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Unread 08-29-2011, 09:04 AM   #9
Noplainsdrifter
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My money would be on bad u-joints!
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Unread 08-29-2011, 11:43 AM   #10
gojeepin
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Quote:
Originally Posted by Noplainsdrifter View Post
My money would be on bad u-joints!
That's why i asked if he felt it in the feet/seat. That's usually where a rear driveshaft imbalance is felt.

Since the vibration is tied to driveline load, it's driveshaft related. Unless pinion and transfer case angles have been changed, I'd recommend checking the u-joints too.
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Vibration? Bump steer? Wandering? Read: Steering, suspension, and driveline basics. An article on how it works and where to look for problems.

83 CJ7, 4.1L 6cyl (4.0L bored .030" over), 35" tires, T-5 transmission, Dana 300 TC, Trussed AMC 20.
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Unread 08-29-2011, 05:27 PM   #11
Darrin29
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U JOINTS!!! ding ding!!! You guys are right, I'm stupid, but learning and thankful for the advice.

Darrin
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