If you can figure this out you are GOOD! - Land Rovers Only

cbwhitley · 05-12-2008, 11:50 AM

I have an 04 Disco with 55K miles. I have a vibration that I thought was a drive shaft, however after a rebuild ( and rebalance of the driveshaft) I have the exact same vibration. It most noticeable between 67 and 75 or so MPH. It is worse under load. For example..while going up hill at this speed the vibration is so bad that the rear view mirror is blurry. When I back off the accelorator the vibration basically stops. I have taken the following steps

1. Purchased new tires and had them rebalanced at another shop just to be sure.
2. rebuilt the front drive shaft as stated above

What else could this be?

1. Low trans fluid (plan to change it this weekend)
2. Bad motor mount
3. Bad trans mount

unstable · 05-12-2008, 11:59 AM

Quote:

Feel deep low frequency vibration on 60~70 mph?
The cracked rubber coupler is the 2nd suspect after the incorrect wheel balance

maybe?

cbwhitley · 05-12-2008, 12:15 PM

Is this on the rear shaft?

Disco Mike · 05-12-2008, 12:47 PM

Read my reply on the other site.
Mike

jmrivera · 05-12-2008, 08:52 PM

This sounds like a stupid suggestion, but have you scraped the interior of your wheels? My '03 had a thick layer of brake dust and road grime that had never been cleaned off (bought it used) and I had the same issue... I felt an immediate difference - all I need to do now is have the tires balanced...

btharp · 05-13-2008, 05:29 AM

Quote:

Originally Posted by Disco Mike

Read my reply on the other site.
Mike

What other site?

btharp · 05-13-2008, 05:31 AM

Quote:

Originally Posted by cbwhitley

It is worse under load. For example..while going up hill at this speed the vibration is so bad that the rear view mirror is blurry. When I back off the accelorator the vibration basically stops. I have taken the following steps

Engine issue, not wheels, tires, or tranny.

just a novice guessing.

bruce

cbwhitley · 05-13-2008, 07:42 AM

The rubber coupler looks great. Changed the transfer case oil and no filings so it looks fine. Still thinking about tire balancing. Has anyone heard of Radial Force Variation balancing? Here is a clip I got from the Mercedes Benz magazine I got the other day..

http://www.mbca.org/pages/Star/artic...eStar_0508.pdf

Alak · 05-14-2008, 10:30 AM

Just because the rubber coupler looks good, doesnt mean it is. There could be a washer missing off one of the bolts, or one of the bolts is different. Even the slightest ounce could throw it off balance.

I've experienced something similar in another vehicle years ago. The rear driveshaft was bent ever so slightly that at only 55MPH plus it would shake the truck. It took 3 u-joint replacements to figure this out. I ended up changing the shaft for a spare and I never had another problem.

This sounds like more of a rear end problem. Usually if its front end parts, or inner joints, it happens at a much lower speed.

I would perhaps get the rear u-joints replaced (depending on the cost of course) and then the shaft maybe balanced. Or find a spare from somewhere and just replace the whole thing. And of course, replace the rubber coupler.

05-12-2008, 11:50 AM	#1 (permalink)
cbwhitley Member Join Date: May 2008 Posts: 5 Gallery: 0	If you can figure this out you are GOOD! I have an 04 Disco with 55K miles. I have a vibration that I thought was a drive shaft, however after a rebuild ( and rebalance of the driveshaft) I have the exact same vibration. It most noticeable between 67 and 75 or so MPH. It is worse under load. For example..while going up hill at this speed the vibration is so bad that the rear view mirror is blurry. When I back off the accelorator the vibration basically stops. I have taken the following steps 1. Purchased new tires and had them rebalanced at another shop just to be sure. 2. rebuilt the front drive shaft as stated above What else could this be? 1. Low trans fluid (plan to change it this weekend) 2. Bad motor mount 3. Bad trans mount

05-12-2008, 08:52 PM	#5 (permalink)
jmrivera Member Join Date: Feb 2008 Location: Albuquerque, NM Posts: 70 Gallery: 0	This sounds like a stupid suggestion, but have you scraped the interior of your wheels? My '03 had a thick layer of brake dust and road grime that had never been cleaned off (bought it used) and I had the same issue... I felt an immediate difference - all I need to do now is have the tires balanced... Last edited by jmrivera : 05-12-2008 at 08:53 PM. Reason: spelling

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05-12-2008, 12:15 PM	#3 (permalink)
cbwhitley Member Join Date: May 2008 Posts: 5 Gallery: 0	Is this on the rear shaft?

05-12-2008, 12:47 PM	#4 (permalink)
Disco Mike Moderator Join Date: Aug 2004 Location: Parker, Colorado Posts: 5,116 Gallery: 0	Read my reply on the other site. Mike

05-13-2008, 07:42 AM	#8 (permalink)
cbwhitley Member Join Date: May 2008 Posts: 5 Gallery: 0	The rubber coupler looks great. Changed the transfer case oil and no filings so it looks fine. Still thinking about tire balancing. Has anyone heard of Radial Force Variation balancing? Here is a clip I got from the Mercedes Benz magazine I got the other day.. http://www.mbca.org/pages/Star/artic...eStar_0508.pdf

05-14-2008, 10:30 AM	#9 (permalink)
Alak 2002 Discovery II SE Join Date: Sep 2007 Location: Alberta, Canada Posts: 262 Gallery: 0	Just because the rubber coupler looks good, doesnt mean it is. There could be a washer missing off one of the bolts, or one of the bolts is different. Even the slightest ounce could throw it off balance. I've experienced something similar in another vehicle years ago. The rear driveshaft was bent ever so slightly that at only 55MPH plus it would shake the truck. It took 3 u-joint replacements to figure this out. I ended up changing the shaft for a spare and I never had another problem. This sounds like more of a rear end problem. Usually if its front end parts, or inner joints, it happens at a much lower speed. I would perhaps get the rear u-joints replaced (depending on the cost of course) and then the shaft maybe balanced. Or find a spare from somewhere and just replace the whole thing. And of course, replace the rubber coupler.

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