#1002904 - 08/12/06 08:28 AM
Rear end "clunk"
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Rookie
Registered: 07/31/06
Posts: 65
Loc: SW Va
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I'm getting a rear end "clunk" when accelerating hard from a dead stop. Now this is NOT the universal joints on the driveshaft. I know that sound. This is more like the rear spring(drivers side) is loading up and hitting a bump stop or something. I will be going underneath her this evening, but wanted to get some ideas of what it could be. Thanks, V.
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1997 Ford Crown Vic P71.
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#1002905 - 08/12/06 04:05 PM
Re: Rear end
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Over the Hill
Registered: 05/16/06
Posts: 4308
Loc: Socialist State of MN
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rear control arms? just a guess
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-Carl 1997 Crown Victoria p71, garage queen. 135,000 miles. T-45 swap in progress. MZT, J-Mod with springs removed, ENS bushings, IAS shocks, magnaflow cat pipes, Truetrac, 02 brakes, 99 TC rims, 97 TC seats, Mark VIII fan.  1987 Mercedes-Benz 300D Turbo. Winter car. 139hp of slow. 227k when the odometer broke long ago. Runs, shifts, drives, doesn't rust.
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#1002906 - 08/12/06 04:27 PM
Re: Rear end
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Mr. Kozmo
Grand Poobah
Registered: 01/28/02
Posts: 13886
Loc: member since 8/2001 lost in Ma...
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don't forget about the rear spring insulatores. When I fist got my 97 PI it was making the clunking noise and gfor the life of me I could never figures it out. When I replaced the rear springs I noticed that the insulator was not seated properly and it was torn and deteriated and springs was rubbing against the metal. A new set of insulator and springs and it went away.
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 R.I.P Elfy 6/06 97 PI
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#1002907 - 08/12/06 07:19 PM
Re: Rear end
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Rookie
Registered: 10/03/05
Posts: 51
Loc: Wisconsin
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My clunk was teeth of my spider gear getting picked back up in the gear lube.
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2000 CVPI 115K Miles, ported upper intake, 70mm throttle body.
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#1002909 - 08/15/06 10:53 AM
Re: Rear end
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Climber
Registered: 06/30/05
Posts: 611
Loc: Indy
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If your 150% sure its not the U joints, I would guess the rear differential. I would check your springs/shocks, and if neither of these are the cause, I would second guess your U joints.
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2004 Mustang GT, 5 spd, Dark Shadow Gray, leather, loaded, Bullitt wheels, purchased Aug 09 with 14K original miles.
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#1002910 - 08/15/06 12:08 PM
Re: Rear end
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Rookie
Registered: 07/31/06
Posts: 65
Loc: SW Va
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Quote:
If your 150% sure its not the U joints, I would guess the rear differential. I would check your springs/shocks, and if neither of these are the cause, I would second guess your U joints.
I know its not the U-joints. It will shift into Drive/Reverse with no clunking. It will already be in drive, with the rear end 'loaded up', I'll hit the gas and then hear the noise. It isn't really a clunk, but a thud.
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1997 Ford Crown Vic P71.
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#1002911 - 08/15/06 12:12 PM
Re: Rear end
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Grand Poobah
Registered: 02/27/02
Posts: 12123
Loc: Grand Rapids, MI
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I'd get under there and look real hard at all 4 rear control arms as well as the transmission mount. Does it make the noise when you hit bumps and turn sharp? Possibly swaybar endlink mounting plates...
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Dead: 1994 Crown Vic LX/HPP... over 190,000 miles when she got totalled  Gone: 1996 Mustang GT 5spd, drop top, Bassani OR X-pipe, Dynomax Ultraflows, PI Cams, K&N FIPK, C&L Elbow and 75mm TB, PIAA 1700X... Dead: 2012 Mustang V6 Performance Package, Kona Blue with MagnaFlow "Street" catback. KIA August 2012
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#1002912 - 08/19/06 03:45 AM
Re: Rear end
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Member
Registered: 05/23/06
Posts: 133
Loc: Washington state
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Something rolling around in the trunk?  (Don't laugh...I've had 'mysterious clunking noises' that sounded really worrisome that turned out to be some piece of loose cargo.)
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1995 Ford Police Interceptor
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Registered: 04/10/13
Posts: 17
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