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#1002904 - 08/12/06 08:28 AM Rear end "clunk"
VinnyT Offline
Rookie

Registered: 07/31/06
Posts: 65
Loc: SW Va
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.
_________________________
1997 Ford Crown Vic P71.

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#1002905 - 08/12/06 04:05 PM Re: Rear end
Ciffer Offline
Over the Hill

Registered: 05/16/06
Posts: 4344
Loc: Socialist State of MN
rear control arms? just a guess
_________________________
-Carl
1997 Crown Victoria p71, garage queen. 135,000 miles.
MZT, T-45, 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
cvpi71 Offline
Mr. Kozmo
Grand Poobah

Registered: 01/28/02
Posts: 13886
Loc: member since 8/2001 lost in Ma...
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.
_________________________

R.I.P Elfy 6/06
97 PI

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#1002907 - 08/12/06 07:19 PM Re: Rear end
adam00cvpi Offline
Rookie

Registered: 10/03/05
Posts: 51
Loc: Wisconsin
My clunk was teeth of my spider gear getting picked back up in the gear lube.
_________________________
2000 CVPI 115K Miles, ported upper intake, 70mm throttle body.

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#1002908 - 08/15/06 12:34 AM Re: Rear end
Absolut_Justice Offline
Rookie

Registered: 08/13/06
Posts: 57
Loc: Arkansas
Is your Emergency Brake fully operational?

If not, that maybe the problem. Just go with me on that...happened to my Chevy Camaro.

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#1002909 - 08/15/06 10:53 AM Re: Rear end
cop4christ Offline
Climber

Registered: 06/30/05
Posts: 611
Loc: Indy
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.
_________________________
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
VinnyT Offline
Rookie

Registered: 07/31/06
Posts: 65
Loc: SW Va
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.
_________________________
1997 Ford Crown Vic P71.

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#1002911 - 08/15/06 12:12 PM Re: Rear end
Buck268 Offline
Grand Poobah

Registered: 02/27/02
Posts: 12123
Loc: Grand Rapids, MI
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...
_________________________
Dead: 1994 Crown Vic LX/HPP... over 190,000 miles when she got totalled frown
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 frown

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#1002912 - 08/19/06 03:45 AM Re: Rear end
Orv Offline
Member

Registered: 05/23/06
Posts: 133
Loc: Washington state
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.)
_________________________
1995 Ford Police Interceptor

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