Excursion: What's my problem

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Dec 17, 2010 | 09:41 PM

dake722

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Excursion: What's my problem

I bought a 01 ford excursion 7.3 and since i have had it i have had a shake/vibration that i thought was just my tires but after a new set and several balances i still have the same problem. I never had a roar or any noise coming from my driveshaft but was told that it could be out of balance, i took it to a machine shop and after replacing the u-joints and a balance i have developed a roar at 45 and continues until 65 and i still have my original shake/ vibration.. i have taken the shaft back to the machine shop and had a different set of u-joints put in and had it balanced again and it's worse. the roar continued after 65 so i had the machine shop build me a new shaft using my yoke and yet another better as he called it set of u-joints put in (non greasable) to have the same roar not after 65 anymore but still at 55 so i have a problem so where that is driving me nuts!!! mostly stock except for new set of michelin's 285/75/16, rancho adjustable shocks including steering stabilizer,and i have a predator tuner on the vehicle. if anyone can help it would be much appreciated!!!
Josh

Dec 18, 2010 | 02:06 AM

Rickx

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From: Franktown, CO

It's time to crack the pumpkin.

Dec 18, 2010 | 09:18 AM

dake722

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what exactly does that mean?

Dec 18, 2010 | 10:39 AM

Rickx

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From: Franktown, CO

That means check your rear differential. I had the same issues. And went through the same process as you the only difference is I took it to a dealer and they started with the rear diff. The clutches in the limited slip were torn up. They rebuilt it and got rid of the roar coming from the back. I still had the vibration, though. They sent the driveshaft out to be checked. It took two diffent shops for the second one to balance it. That cleared up my vibration issue. I don't know if this is your problem, but inspecting the fluid in your rear diff may show you something. The reason I say open it up and physically inspect is it may have fresh fluid in it but not been repaired. The dealer used sensors and a laptop to isolate the source of noise and vibration on a test drive. To assist in this process clean out your Ex and remove your back seat. Take it to someone who can "listen" in this manner.

Dec 18, 2010 | 10:44 AM

Rickx

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From: Franktown, CO

Another thought. Have them check the angles. You may need to shim the rear end and lessen the degree of angle. That's the the thing about used vehicles, you never know what they've been through.

Dec 18, 2010 | 08:38 PM

EXCURSIONATOR1

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From: mt.prospect

I had the same problem with my 1972 mustang. It was the pinion angle.It would roar or shake after 55mph. Ujoints were taking a beating

The best explanation someone gave me was a driveshaft is like a joperope both handles have to be in sync.
The pinion angle off the trans. nees to be in sync with the angle on the diff.

Dec 18, 2010 | 11:01 PM

Stewart_H

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From: Central Coast of CA

Quote:

Originally Posted by Rickx

It's time to crack the pumpkin.

Quote:

Originally Posted by dake722

what exactly does that mean?

Pumpkin = Rear Differential

Crack it = Open it up and diagnose any problems that may be present.

Quote:

Originally Posted by Rickx

Another thought. Have them check the angles. You may need to shim the rear end and lessen the degree of angle. That's the the thing about used vehicles, you never know what they've been through.

That was gonna be my advice. Check your pinion angle.

Stewart