Rear End Clunk

01Pooter · November 23rd, 2006, 02:26 PM

Hi guys, this is my first post after reading this site for a while. Anyways im having a problem on my 2001 GT and im not really sure what it could be or how to fix it.

When i am driving and i let off of the gas pedal it seems to make a clunk sound. It feels like tension being released from something in the rear but im not really sure. The car is still stock and i dont think this is normal as everyone who gets in my car comments on it.

HMUSN · November 23rd, 2006, 02:28 PM

U.joints

check for play in your drive shaft.

01Pooter · November 23rd, 2006, 02:32 PM

u mean play in the joint itself or whether i can turn it before it catches in the transmission/differential?

HMUSN · November 23rd, 2006, 02:36 PM

whether i can turn it before it catches in the transmission/differential?

. and if your going to replace one you mght as well do the other

matrixpuba · November 23rd, 2006, 07:37 PM

yup. do them in pairs.

superbeef1000 · November 24th, 2006, 12:10 AM

you can get the aluminum drive shaft with u joints all ready in it for like 250$ kill 2 birds with one stone pluss get a little more power to the wheels
best price and free shipping

http://www.americanmuscle.com/driveshaft.html

superbeef1000 · November 24th, 2006, 12:12 AM

you might as well do the safety loop too while your at it ,,its cheep money

1BAD04SVT · November 26th, 2006, 01:33 AM

THE CLUNK YOU ARE HEARING IS THE WEAK FACTORY DIFFERETIAL BUSHINS WHEN YOU GET ON AND OFF THE GAS ITS CAUSING THE REAR TO PINCH YOU CAN TRY AND TIGHTIN THOSE BUSHING OR BUY THE MM URETHANE DIFFERENTIAL BUSHING KIT THIS WILL SOLVE THE PROBLEM YOU CAN GET THE KIT AT LETHAL PERFORMANCE FOR ABOUT 49$ BUT TRY TO TIGHTI N THEM FIRST

Twist 2 Go · November 26th, 2006, 12:36 PM

turn the caps off! He has a GT which isn't an IRS so it has no "differential bushings". Now with that being said, there is a strong possibility that the control arm bolts are loose. try tightening them and see if that helps.

FOR POINT SIX · November 26th, 2006, 02:38 PM

would tightening the control arm bolts help a rubbing squeaking sound. I only here it at low speeds turning. IE. in parking lots. It my be doing it at higher speeds but I would not hear it over the loud pipes. I have put the car on three racks and see nothing rubbing no bushings torn or any thing. I was starting to think it was the rear end going out. I do lots of burn outs and donuts and the car is leaving more and more one wheel wonders

HMUSN · November 26th, 2006, 09:13 PM

it might be your gears hating you.

i have the same problem right now..
for some reason my gears don't like 5k launches on drag radials...

FOR POINT SIX · November 27th, 2006, 12:37 AM

I am just guessing here but my thought was the track lock ( limited slip what ever it is called) going out, but I do not want to tear any thank apart that does not have to be

01Pooter · November 27th, 2006, 09:55 AM

today after i get home from class i will go ahead and check the control arm bolts, is there any special way of testing the tightness without actually trying to tighten them ? I ask because i don't want to shear the bolts if i start wrenching em down and they are already tight.

01Pooter · December 20th, 2006, 04:14 PM

Well i just took my car into carmax to have the clunk looked at along with the brakes and guess what? carmax is clueless.
Their excuse for the clunk is the amount of torque from being a GT in the differential is causing this. Im not even sure how they arrived at this conclusion but to them everything is fine.
I have to look at my warranty info but if they dont fix this problem im going to take the car down to the local big ford dealership instead of the retards at carmax.

01Pooter · December 20th, 2006, 04:15 PM

Well i just took my car into carmax to have the clunk looked at along with the brakes and guess what? carmax is clueless.

Their excuse for the clunk is the amount of torque from being a GT in the differential is causing this. Im not even sure how they arrived at this conclusion but to them everything is fine.

I have to look at my warranty info but if they dont fix this problem im going to take the car down to the local big ford dealership instead of the retards at carmax.

sonicblue · December 20th, 2006, 05:26 PM

if you are hearing a clunk when you are getting on and off the gas its prolly just slack in the drivetrain and thats perfectly normal. and the transmissions are clunky as well. you might want to take it somewhere else for a second opinion but they are prolly right with theres nothing wrong with it

01Pooter · December 20th, 2006, 11:09 PM

idk I could not imagine being able to sell a brand new car with this. granted this car has 50k miles, I would still assume it shouldnt feel like the back differential is rocking fowards an inch every time I take my foot off the gas pedal.

November 23rd, 2006, 02:26 PM	#1
01Pooter Newbie Join Date: Oct 2006 Posts: 10	Rear End Clunk Hi guys, this is my first post after reading this site for a while. Anyways im having a problem on my 2001 GT and im not really sure what it could be or how to fix it. When i am driving and i let off of the gas pedal it seems to make a clunk sound. It feels like tension being released from something in the rear but im not really sure. The car is still stock and i dont think this is normal as everyone who gets in my car comments on it.

November 23rd, 2006, 07:37 PM	#5
matrixpuba Hardcore Enthusiast Join Date: Sep 2006 Location: tennessee Posts: 2,379	yup. do them in pairs. __________________ http://img.photobucket.com/albums/v2.../matrixsig.jpg

November 24th, 2006, 12:10 AM	#6
superbeef1000 Enthusiast Join Date: Aug 2006 Location: mesa , arizona Posts: 955	you can get the aluminum drive shaft with u joints all ready in it for like 250$ kill 2 birds with one stone pluss get a little more power to the wheels best price and free shipping http://www.americanmuscle.com/driveshaft.html __________________ a bunch of stuff to make my car faster http://www.moddedmustangs.com/forums...e-member-1497/

November 24th, 2006, 12:12 AM	#7
superbeef1000 Enthusiast Join Date: Aug 2006 Location: mesa , arizona Posts: 955	you might as well do the safety loop too while your at it ,,its cheep money __________________ a bunch of stuff to make my car faster http://www.moddedmustangs.com/forums...e-member-1497/

November 26th, 2006, 12:36 PM	#9
Twist 2 Go Hardcore Enthusiast Join Date: Aug 2005 Location: Chesapeake, Virginia Posts: 1,716	turn the caps off! He has a GT which isn't an IRS so it has no "differential bushings". Now with that being said, there is a strong possibility that the control arm bolts are loose. try tightening them and see if that helps. __________________ 88 Mustang Coupe 2006 FFW Richmond True Street Runner-Up www.rickscarcare.net http://img146.imageshack.us/img146/2158/ricksadql2.jpg

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November 23rd, 2006, 02:28 PM	#2
HMUSN Doc 91 Sonic Blue Goodness 19.83 @ 12mph Join Date: Nov 2006 Location: NJ Posts: 27,308	U.joints check for play in your drive shaft.

November 23rd, 2006, 02:32 PM	#3
01Pooter Newbie Join Date: Oct 2006 Posts: 10	u mean play in the joint itself or whether i can turn it before it catches in the transmission/differential?

November 23rd, 2006, 02:36 PM	#4
HMUSN Doc 91 Sonic Blue Goodness 19.83 @ 12mph Join Date: Nov 2006 Location: NJ Posts: 27,308	whether i can turn it before it catches in the transmission/differential? . and if your going to replace one you mght as well do the other

November 26th, 2006, 01:33 AM	#8
1BAD04SVT Look Ma! My First Post! Join Date: Nov 2006 Location: MARYLAND Posts: 1	THE CLUNK YOU ARE HEARING IS THE WEAK FACTORY DIFFERETIAL BUSHINS WHEN YOU GET ON AND OFF THE GAS ITS CAUSING THE REAR TO PINCH YOU CAN TRY AND TIGHTIN THOSE BUSHING OR BUY THE MM URETHANE DIFFERENTIAL BUSHING KIT THIS WILL SOLVE THE PROBLEM YOU CAN GET THE KIT AT LETHAL PERFORMANCE FOR ABOUT 49$ BUT TRY TO TIGHTI N THEM FIRST

November 26th, 2006, 02:38 PM	#10
FOR POINT SIX Enthusiast Join Date: Aug 2006 Location: Nashville TN Posts: 671	would tightening the control arm bolts help a rubbing squeaking sound. I only here it at low speeds turning. IE. in parking lots. It my be doing it at higher speeds but I would not hear it over the loud pipes. I have put the car on three racks and see nothing rubbing no bushings torn or any thing. I was starting to think it was the rear end going out. I do lots of burn outs and donuts and the car is leaving more and more one wheel wonders __________________ http://www.myspace.com/forpointsix My Garage

November 26th, 2006, 09:13 PM	#11
HMUSN Doc 91 Sonic Blue Goodness 19.83 @ 12mph Join Date: Nov 2006 Location: NJ Posts: 27,308	it might be your gears hating you. i have the same problem right now.. for some reason my gears don't like 5k launches on drag radials...

November 27th, 2006, 12:37 AM	#12
FOR POINT SIX Enthusiast Join Date: Aug 2006 Location: Nashville TN Posts: 671	I am just guessing here but my thought was the track lock ( limited slip what ever it is called) going out, but I do not want to tear any thank apart that does not have to be

November 27th, 2006, 09:55 AM	#13
01Pooter Newbie Join Date: Oct 2006 Posts: 10	today after i get home from class i will go ahead and check the control arm bolts, is there any special way of testing the tightness without actually trying to tighten them ? I ask because i don't want to shear the bolts if i start wrenching em down and they are already tight.

December 20th, 2006, 04:14 PM	#14
01Pooter Newbie Join Date: Oct 2006 Posts: 10	Well i just took my car into carmax to have the clunk looked at along with the brakes and guess what? carmax is clueless. Their excuse for the clunk is the amount of torque from being a GT in the differential is causing this. Im not even sure how they arrived at this conclusion but to them everything is fine. I have to look at my warranty info but if they dont fix this problem im going to take the car down to the local big ford dealership instead of the retards at carmax.

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December 20th, 2006, 04:15 PM	#15
01Pooter Newbie Join Date: Oct 2006 Posts: 10	Well i just took my car into carmax to have the clunk looked at along with the brakes and guess what? carmax is clueless. Their excuse for the clunk is the amount of torque from being a GT in the differential is causing this. Im not even sure how they arrived at this conclusion but to them everything is fine. I have to look at my warranty info but if they dont fix this problem im going to take the car down to the local big ford dealership instead of the retards at carmax.

December 20th, 2006, 05:26 PM	#16
sonicblue Hardcore Enthusiast 1990 GT Join Date: Aug 2006 Location: dalzell, south carolina Posts: 1,435	if you are hearing a clunk when you are getting on and off the gas its prolly just slack in the drivetrain and thats perfectly normal. and the transmissions are clunky as well. you might want to take it somewhere else for a second opinion but they are prolly right with theres nothing wrong with it __________________ 1990 5.0 getting all fixed up for next season 2004 mustang gt 520rwhp, 491 trq sold

December 20th, 2006, 11:09 PM	#17
01Pooter Newbie Join Date: Oct 2006 Posts: 10	idk I could not imagine being able to sell a brand new car with this. granted this car has 50k miles, I would still assume it shouldnt feel like the back differential is rocking fowards an inch every time I take my foot off the gas pedal.