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Unread 02-06-2014, 02:02 PM   #1
jaspercomp
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2004 TJ Wrangler 
 
Join Date: Feb 2014
Location: pasadena, maryland
Posts: 1
Strange Fan-like noise while driving

Hello All,

I have a 2004 Jeep Rubicon, 4.0. I have this really strange noise that only happens when I'm driving down the road. It sounds almost like a fan hitting something or something is being hit - not a heavy knocking sound or anything like that. The noise only happens when I'm driving, not at idle, or when I race the engine, engage/disengage the clutch, it's not the heater/ac fan - what else is rotating only while moving?? oh and it's not the brakes, tried to find a correlation between that too, but no luck. Thanks in advance for any advice/suggestions! ps: it could also be described as a fast "clicking sound" but again, it stops when the jeep stops.

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Unread 02-06-2014, 07:07 PM   #2
mukluk
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2000 TJ Wrangler 
 
Join Date: Oct 2010
Location: Clyde, Texas
Posts: 1,466
What rotates only when the Jeep is moving? The driveshafts and axles. You can try driving the Jeep with only the front or rear driveshaft installed to narrow down where the ticking is coming from.
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2000 TJ SE - Rusty's 3" susp w/OME shocks, Stock CAs&TBs, 4.88, F&R Truetracs, 33x10.5 BFG KM2, Bestop tire carrier, MM10500 hydro
2005 LJ Rubicon - RC 4" X-Series w/Bilstein 5100, Stock TBs, 4.10, 33x10.5 BFG AT, Bestop tire carrier, Warn M8000, 1350 series drive shaft, ZJ HD tie rod
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Unread 02-06-2014, 09:18 PM   #3
JPNinPA
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2005 LJ Wrangler 
 
Join Date: Feb 2011
Location: Dayton, Ohio
Posts: 2,258
^^2x or crawl under and look for slop in the u joints by rocking the shafts or axels back and forth. There should be no slop at the u joint.
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Unread 02-07-2014, 05:38 AM   #4
Jwolfer
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2006 TJ Wrangler 
 
Join Date: Apr 2012
Location: Del Rio, TX
Posts: 536
One of your U joints is bad in the front drive shaft. I had the same issue. It could be something else but I'd start there.
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