Driveline vibration at low speeds. - JeepForum.com

 
LinkBack Thread Tools
post #1 of 5 Old 05-25-2010, 10:52 AM Thread Starter
-Deepskyy-
Registered User
1993 YJ Wrangler 
 
Join Date: Mar 2009
Location: Charlotte
Posts: 4,629
Driveline vibration at low speeds.

Yes I know, yet another vibration thread, but I searched and searched.
I finally got rid of the big issues with the pinion angles thanks to my t-case drop, but now I have a vibration from around 25 to 40 mph. After that it goes away for the most part. I've checked the U joints, but I will give them another look tonight or tomorrow night. I have noticed that my motor mounts could be shot, so I am wondering if that could be the problem. Its bad enough that the strap bolts for the u joint at the rear axle will work their way loose and I have to keep tightening them down about once a month or so.

Anyone else dealt with this?


Are you finding the Jeep Forum helpful? Donate today!
Quote:
"I never saw such fighting since God made me. The Americans fought like demons"
-Lt. General Charles, Earl Cornwallis after the battle of Guilford Courthouse NC
Quote:
Originally Posted by Outatime05 View Post
Females are a dime-a-dozen. Jeeps are forever. Easy choice. Be indispensible or be gone. :wave:
Quote:
Originally Posted by jeepdavetj View Post
We are Jeepforum. We can do the unthinkable. We are Jeep strong. And head stubborn. We are. JEEPFORUM.
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
Red Jeep #543
-Deepskyy- is offline  
Sponsored Links
Advertisement
 
post #2 of 5 Old 05-25-2010, 11:51 AM
moonshinefuel
Registered User
1995 YJ Wrangler 
 
Join Date: Feb 2009
Location: Los Angeles. California. United States.
Posts: 4,910
Sounds like you have different things going on there with possibilities as to why the vibes are happening. From what I understand it is difficult to check the u-joints without taking the u-joints off the shaft itself, and inspecting each one individually. It may seem ok while crawling under your jeep and turning the shaft, etc. If you have bad motor mounts, or transmission mount, of course that is not going to work in your favor either, but I think that would be more of a shifting or a clunking. 25-40 mph vibes..hmm, well, something is obviously out of balance. Things that can cause it: Something as simple as a bad tire, unbalanced tire, or u-joints, or even in one case I knew of was a bent axle shaft in the axle housing. If you have been messing with your drive-line angles, it might just be a u-joint problem though.
moonshinefuel is offline  
post #3 of 5 Old 05-25-2010, 12:42 PM
Louie4
Jeep Enjuneering
 
Louie4's Avatar
1993 YJ Wrangler 
 
Join Date: Aug 2008
Location: Raleigh
Posts: 10,771
If your motor mounts are sagging or worn out they will lower the motor and in turn slightly raise the t-case output. I would also check the tranny bushing. Maybe take a pic of your rear driveline unless you're certain it's not the problem.

Also check to see if your front driveshaft will free spin just to eliminate it. I've had my front axle stay locked in causing the front to spin and had a little vibration there. Now that I have a front locker it spins all the time so I had it balanced.

Other than that do as said above with the tires, they might need balancing.

Lou

I have a jeep...and it is modified...I win.

YJOTM July 2012
YJOTM February 2014

Louie4's YJ Build
Poison Spyder Fender Install
Warn M8000 Rebuild Adventure
University of Georgia
Louie4 is offline  
post #4 of 5 Old 05-25-2010, 03:04 PM Thread Starter
-Deepskyy-
Registered User
1993 YJ Wrangler 
 
Join Date: Mar 2009
Location: Charlotte
Posts: 4,629
Tires are a possibility, due to a few recent mud runs so they could be packed up and way out of balance. I'll start there, but I'll aslo take a snapshot of the driveline and post it up.

Are you finding the Jeep Forum helpful? Donate today!
Quote:
"I never saw such fighting since God made me. The Americans fought like demons"
-Lt. General Charles, Earl Cornwallis after the battle of Guilford Courthouse NC
Quote:
Originally Posted by Outatime05 View Post
Females are a dime-a-dozen. Jeeps are forever. Easy choice. Be indispensible or be gone. :wave:
Quote:
Originally Posted by jeepdavetj View Post
We are Jeepforum. We can do the unthinkable. We are Jeep strong. And head stubborn. We are. JEEPFORUM.
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
Red Jeep #543
-Deepskyy- is offline  
post #5 of 5 Old 06-09-2010, 07:23 PM Thread Starter
-Deepskyy-
Registered User
1993 YJ Wrangler 
 
Join Date: Mar 2009
Location: Charlotte
Posts: 4,629
Bamp! An interesting discovery. The more weight in the jeep, the worse the vibration. If I am in her alone, it is barely noticeable. If my gf and I are together it gets worse. A few weekends ago, I had 4 people in the Jeep and it really shook. Any ideas? Nothing seems to be negatively impacted, other than the fact that I have to remember to tighten the u-joint strap bolts about once a month.

Are you finding the Jeep Forum helpful? Donate today!
Quote:
"I never saw such fighting since God made me. The Americans fought like demons"
-Lt. General Charles, Earl Cornwallis after the battle of Guilford Courthouse NC
Quote:
Originally Posted by Outatime05 View Post
Females are a dime-a-dozen. Jeeps are forever. Easy choice. Be indispensible or be gone. :wave:
Quote:
Originally Posted by jeepdavetj View Post
We are Jeepforum. We can do the unthinkable. We are Jeep strong. And head stubborn. We are. JEEPFORUM.
/l , [____],
|---L--[]lllllll[]-
()_) ()_)==O=)_)
Red Jeep #543
-Deepskyy- is offline  
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.



Email Address:
OR

Log-in









Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page



Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Vibration at certian speeds Smokeybear97 TJ Wrangler Technical Forum 14 03-18-2010 07:09 PM
Vibration/grinding at very low speeds! Rafic JK Wrangler Technical Forum 29 01-07-2010 04:43 PM
Vibration at slow speeds bassmanrl TJ Wrangler Technical Forum 7 12-23-2009 12:49 PM
Steering Vibration at ALL Speeds Jeff5886 TJ Wrangler Technical Forum 16 12-02-2008 06:08 PM
Vibration @ Highway speeds . . . live2hunt TJ Wrangler Technical Forum 8 10-03-2008 07:48 AM

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome