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post #1 of 36 (permalink) Old 06-25-2007, 11:47 PM Thread Starter
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Hollow rumbling sound coming from rear of truck

Has anyone else experienced a hollow rumbling noise coming from the rear of their truck? I thought it might have been wind noise form the crossbars so I removed them, no change. Made sure the spare tire is tight as well as all the skid plates and other bolt on items, including the Gibson exhaust.

The only thing I can think of is that the rear shocks might be causing it since they reused the OEM shocks on the 2" lift. I looked at them and they look almost fully extended with the lift installed. Can I replace the rear shocks with some ProComps or Ranchos and not screw up the ESP/BAS system? 4WP was going to do that but didn't want the liability issues with the ESP/BAS system.

2006 XK Sport, 4.7l, QTII- many mods
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post #2 of 36 (permalink) Old 06-25-2007, 11:56 PM
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Re: Hollow rumbling sound coming from rear of truck

How many miles do you have on it? Does it sound like it is coming from one side or the middle?
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post #3 of 36 (permalink) Old 06-26-2007, 12:00 AM Thread Starter
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Re: Hollow rumbling sound coming from rear of truck

10500. Hard to tell, but it sounds centered. Only does it at high speed or when I go over something rough in the road. If I hit a manhole cover or similar then it sounds like it comes from one side.

2006 XK Sport, 4.7l, QTII- many mods
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post #4 of 36 (permalink) Old 06-26-2007, 06:36 AM
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Re: Hollow rumbling sound coming from rear of truck

Unless its something like the exhaust rubbing against something I would be concerned about the rear differential. First thing I would do is make sure the differential is full of gear oil (or change the oil if its anywhere near time). If you do change the fluid or if someone else does it be sure and have it checked for any evidence of gear wear, ie small metal particles etc in the fluid. If there is no problem there then whatever the problem is it probably isnt serious. john
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post #5 of 36 (permalink) Old 06-26-2007, 08:29 AM Thread Starter
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Re: Hollow rumbling sound coming from rear of truck

Its getting close to its 12k service, so I'll have them look at it then. I think that a drain and fill of the rear diff is part of the service IIRC.

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post #6 of 36 (permalink) Old 06-26-2007, 08:48 AM
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Re: Hollow rumbling sound coming from rear of truck

A bad axle bearing could also cause a rumbling sound true. Not really sure.
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post #7 of 36 (permalink) Old 06-26-2007, 10:09 AM
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Re: Hollow rumbling sound coming from rear of truck

I installed Rustys 2" kit which included new rear shocks. They said the stock shocks aren't long enough. I bet your problem is related to that.
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post #8 of 36 (permalink) Old 06-26-2007, 10:17 AM Thread Starter
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Re: Hollow rumbling sound coming from rear of truck

Quote:
Originally Posted by walkjon
I installed Rustys 2" kit which included new rear shocks. They said the stock shocks aren't long enough. I bet your problem is related to that.
Probably. Going to order the ES9000s for the rear install them to see if that helps. Didn't have this before the lift, so I think that's the culprit. 4WP wouldn't install them, very paranoid about getting sued if the vehicle is messed up or is in an accident due to their work.

2006 XK Sport, 4.7l, QTII- many mods
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"Men sleep peacefully in their beds at night because rough men stand ready to do violence on their behalf."- George Orwell



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post #9 of 36 (permalink) Old 06-26-2007, 11:52 AM
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Re: Hollow rumbling sound coming from rear of truck

Quote:
Originally Posted by rwmorrisonjr
Probably. Going to order the ES9000s for the rear install them to see if that helps. Didn't have this before the lift, so I think that's the culprit. 4WP wouldn't install them, very paranoid about getting sued if the vehicle is messed up or is in an accident due to their work.
Who is 4WP? I want to make sure I never use them to work on my Jeep.
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post #10 of 36 (permalink) Old 06-26-2007, 12:52 PM Thread Starter
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Re: Hollow rumbling sound coming from rear of truck

4WP= 4 Wheel Parts. They're okay, good for bolt on stuff for newer vehicles, just very paranoid about lawsuits since they're based in Cali.

2006 XK Sport, 4.7l, QTII- many mods
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'An armed society is a polite society. Manners are good when one may have to back up his acts with his life."- Robert A. Heinlein

"Men sleep peacefully in their beds at night because rough men stand ready to do violence on their behalf."- George Orwell



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