I NEED HELP!!! Excursion driveline vibration.

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Jun 3, 2006 | 11:59 PM

Gary4747

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I NEED HELP!!! Excursion driveline vibration.

Ive never used this site before, so please bear with me. I am having an incredibly difficult time trying to pinpoint this loud, agressive vibration that my 2000 Excursion has. Its lifted 10 inches. The majority if the noise seems to be coming from the transfer case, so I replaced the unit. The noise didnt change a bit. It comes anywhere from 40 to 60mph, and only on decel. It sounds just like a bearing grinding. At first, I thought that for sure my pinion bearings were done. Not so. All diff bearings are good. If I continue to decel, the noise/vibration will slowly decreace until its gone at about 35 mph. I can duplicate it on a hoist, but only with the driveshaft installed. It wont do it without the driveshaft. I tried changing the pinion angle, slightly lowering the transfer case, had my driveshaft balanced, U-joints replaced, but nothing changes this growling, grinding chatter. Its so loud. The slip yoke is tight and not worn or stretched out. Has anybody ever heard of such a situation?

Last edited by Gary4747; Jun 4, 2006 at 12:05 AM. Reason: additional info

Jun 4, 2006 | 08:21 AM

fishmanndotcom

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Joined: May 2000

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From: Senoia, GA

are you runnnin a CV joint on one end of your driveshaft? (two u-joints next to each other on one end of the driveshaft)
if not you may need one with that much lift, if you do have one you may need to service or even rebuild the CV head

-cutts-

Jun 4, 2006 | 09:19 AM

JeremyH

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From: Houston, Texas

You definitely need a driveshaft with a double cardan joint at one end an a slip joint in the middle.

You can get rid of the bad driveline angles by either lowering the t-case outputs (drop the skid from the frame), raise the engine (extended motor mounts), or get a fixed yoke kit for the t-case output.

Jun 4, 2006 | 04:49 PM

Skipped_link

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I will have to agree that it sounds like you are running the single joint drive shaft, having a drive line built with a double cardan joint will fix your problem, My 03 is a supercab short bed with an 8" lift and had the same problem, the double cardan joint was the fix for me,

Jun 4, 2006 | 05:04 PM

JeremyH

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From: Houston, Texas

BTW, this list is in order of increasing cost.

Quote:

Originally Posted by JeremyH

You can get rid of the bad driveline angles by either lowering the t-case outputs (drop the skid from the frame), raise the engine (extended motor mounts), or get a fixed yoke kit for the t-case output.