driveline vibration!!

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Aug 2, 2018 | 10:56 PM

autoxtech

Thread Starter

Mountain Pass

Joined: Aug 2006

Posts: 146

Likes: 2

From: va

driveline vibration!!

ok , i think i need a driveshaft. when i drive around 70 mph unloaded i get a vibration, checked all tires and wheels, rotated tires nothing changes, i did notice when i had a 8000 pound toy hauler behind it the vibration is not as bad. plus i just had to get a vehicle with my open trailer and on the way to the to pick up the car nothing on the trailer the vibration was more noticable at 30 mph , really bad , and again at 65-70 , like a tire was not round at all, trailer full size truck no vibration at 30 slight at 65 and when i unloaded dropped everything off empty truck for the way home, no problem. i do have some traction bars that attach to the rear end and are welded to the body under the rear seat area on the frame. i did make sure the rods where tight last night and they where loose so i tightened them up and it seems like it made the vibration worse. i had this same problem when i got the truck 8 years again and added a shim to the carrier of the driveshaft and it has been good now it is back. the truck is stock, expect 285 75 16 tires on 16x10 wheels, no lift

Aug 3, 2018 | 08:17 AM

jimjokjv

More Turbo

Joined: Jun 2017

Posts: 731

Likes: 15

From: Arizona

Did you have the tires balanced?
I had a similar problem and had the shop rotate and balance the tires. Sure enough one of them was way out of balance. This actually got me thinking that my Lincoln was starting to vibrate a bit so I took that to the shop as well and again a tire out of balance was the culprit.
Driveline problems usually get worse under load not better and are more constant through the RPM range.

Aug 3, 2018 | 08:45 AM

Colorado350

Postmaster

Joined: Nov 2015

Posts: 4,807

Likes: 125

From: Colorado Springs

CHECK TIRES FIRST, seriously, get your tires balanced first. You could have lost a weight and having the tires balanced is cheaper than a new DS. If you have a tire that doesn't balance have them mark the tire on the rim then spin it 180° And try again, if for some reason they still won't balance have them see if they can get them to the balance by itself, you may have a bent rim.

Aug 3, 2018 | 10:03 AM

papadave

Freshman User

Joined: Feb 2017

Posts: 43

Likes: 0

I second Colorado350, balance 1st, they can check for out of round or bent rims at the same time. Old bias ply tires used to be prone to flat spotting,glass belted had the same issues.

Aug 3, 2018 | 03:16 PM

carl2591

Fleet Mechanic

Joined: Nov 2005

Posts: 1,508

Likes: 87

From: North Carolina, Raleigh

Bent rim..or, believe it or not,, water in the tire. I had tire on Elantra that would not balance. the shop had me take car to another location as they though there was problem with the machine. Took to other location and same thing.. they would take all weights off, run balance machine, install weights as per machine, and respin to check and it come up off.. There was older guy work in shop and was sorta keeping up with the goinging on.. came over and told younger tech to dismount tire. he suspected water, sure enough water.. said it can come in around, yes around the valve stem.. dumped out water, replaced valve stem and back on balance first try..

SO moral to story is make sure tires are balanced first and all tire balance properly..

Quote:

Originally Posted by Colorado350

Aug 3, 2018 | 06:32 PM

coax9952

Laughing Gas

Joined: Aug 2014

Posts: 1,020

Likes: 9

From: Washington State

My Vote is U-Joints, Carrier bearing, Or you lost the balancing weights on your driveline.

Aug 3, 2018 | 06:43 PM

Stewart_H

Super Moderator

Joined: May 2004

Posts: 29,380

Likes: 118

From: Central Coast of CA

There's a tech link in the Excursion forum Tech Folder (2nd post, Suspension section) where you can find a thread that may help to determine what's causing it.

The link is in the subcategory "Axles, Hubs, Ball Joints"

Stewart