Weird noise coming from rear-end

sssvtcobra · 02-28-2005, 12:23 PM

I have a weird noise coming from the rear-end of my '04. I only hear it if I'm pulling into or out of a driveway or a slight incline/decline. I hear it from both sides, but it also depends on which way I am turning on that incline/decline to which side makes the noise. It seems like the side that makes the noise is the side that the suspension extends rather than gets compressed. My car suspension wise is totally stock. I do have a bassani mid-pipe and SLP cat-back. My wheel and tires aren't stock they are 18x9. Can anybody help me out. I have been trying to find the noise ever since I bought the car new. I would like to do suspension upgrades but I feel I should wait until I find out what this noise is. So Ford doesn't blame it on the mod's.

I forgot to mention that the noise I'm hearing sounds like a slight thump or thud. Almost like something is extending all the way and then hitting a stop.

I have heard something about a 12mm bolt being used rather than a 14mm bolt somewhere in the rear but not sure where or what bolt. Has anybody else heard this or know what I'm talking about?

Thanks for any help
Jeff

Lumpydogs · 02-28-2005, 01:01 PM

The wrong bolt issue is regarding the IRS bushings. I don't know if it
affected the '03 & '04 cobras. Check out www.maximummotorsports.com
and look up IRS bushings. There is more info.

sssvtcobra · 02-28-2005, 01:43 PM

Thanks, Lumpydogs

I will have to check it out. Is there an easy way to check or to reach the bolts if I have access to a lift? It is the bolts that attach the IRS to the frame/body right? Does anybody have pictures of where these bolts are?

Thanks,
Jeff

Lumpydogs · 02-28-2005, 04:12 PM

Here

http://www.maximummotorsports.com/in...MMIRSU-1r2.pdf

sssvtcobra · 02-28-2005, 07:07 PM

Just what I was looking for, Thanks

I wonder if I could get my dealership to replace the bolts for free under warranty if they are infact the 12mm size. Maybe at the same time I'll see if they would be willing to put the polyurethane bushings in for me. My step dad used to work for them in the body shop, until he passed last month. He was very well liked down there. I'll have to get under my car tomorrow to see if they are 12mm or 14mm.

Thanks,
Jeff

Lumpydogs · 02-28-2005, 08:28 PM

Quote:

Originally Posted by sssvtcobra

Just what I was looking for, Thanks

I wonder if I could get my dealership to replace the bolts for free under warranty if they are infact the 12mm size. Maybe at the same time I'll see if they would be willing to put the polyurethane bushings in for me. My step dad used to work for them in the body shop, until he passed last month. He was very well liked down there. I'll have to get under my car tomorrow to see if they are 12mm or 14mm.

Thanks,
Jeff

You are welcome.

Sorry to hear about your dad.

sssvtcobra · 03-01-2005, 01:50 PM

Thank you for the condolences. He's doing alot better now than what he was doing. He was in alot of pain just walking and getting up from sitting or laying down.

Thanks,
Jeff

flynfink · 03-01-2005, 03:18 PM

sssvtcobra · 03-01-2005, 06:44 PM

Quote:

Originally Posted by flynfink

My wife would say that the title is my life story

I didn't even realize that about the title until you mentioned it Flynfink, that does sound funny and weird

deathrull · 03-09-2005, 01:57 AM

It probably is the front IRS bolts. I just put the IRS prothane bushing kit in and I had the wrong size bolts in the front. I had seen the warning on the MM webpage about the 03's but figured it was fixed for the 04's so I didn't order the bolts with the bushings. I was wrong

So unfortunately they are still there till this coming weekend. But now I feel it clunk/shift when I take off and slow down. annoying for sure. To get access to them you have to drop the cat-back since they go through the frame.

sssvtcobra · 03-09-2005, 02:03 PM

Thanks deathrull

I am going to have my dealership take a look at it the next time I take it in for an oil change. Infact I just got back from there. I talked to one of the service writers that I've known for a long time and he said for me to just bring it in and they will take a look at it. He said they wil change the bolts out if they are in fact 12mm instead of the 14mm. I only hear the noise if I am pulling into or out of a slanted drive way. And depending on which way I am turning depends on what side I hear the noise. I don't hear when I speed up or slow down though.

Venom55 · 03-12-2005, 03:16 AM

I recommend getting the bigger size bolts but maximum does offer a urethane kit that has 12mm bolt size for the front mounts and 14's for the rear...that was the kit i used when i did the swap on my '98...btw, PITA as far as chaning out those rubber bushings to urethane.

sssvtcobra · 03-12-2005, 02:06 PM

So all four bolts are supposed to be 14mm, right? I think I am going to see if I can check for the size of them next week when I swap out my mufflers. That way I know for sure. Has anybody tried to get their dealership or Ford to replace these bolts with 14mm before? I think I am going to try to get them to replace them if they are 12mm. I still have another 500 miles before my next oil change, and thats when I am going to drop it off for them to look at it or possibly replace them if needed.

Thanks for the replies, lots of help

deathrull · 03-13-2005, 10:11 PM

Actually venom55 has them backwards. The front IRS subframe bolt is a 14MM and rear IRS subframe bolt is a 12MM. MM does sell the correct bolts for the front subframe but it sounds like you already have it covered through the ford dealership so that would be a lot less painful way to go. I would have done that if I knew I had the wrong bolts before I started. I did put the 14 MM bolts in yesterday and it was fairly easy but can't test them due to waiting on another install

sssvtcobra · 03-14-2005, 09:45 PM

So how are the bolts supposed to be correct from the factory?

Front=14mm
Rear=12mm

Or

Front=14mm
Rear=14mm

Which ones are supposed to be 14mm and the factory is sometimes putting in 12mm?

Sorry but know I seem confused for some reason

Thanks
Jeff

02-28-2005, 12:23 PM	#1
sssvtcobra SCMC Member Join Date: Feb 2004 Location: Eugene, OR Posts: 441	Weird noise coming from rear-end I have a weird noise coming from the rear-end of my '04. I only hear it if I'm pulling into or out of a driveway or a slight incline/decline. I hear it from both sides, but it also depends on which way I am turning on that incline/decline to which side makes the noise. It seems like the side that makes the noise is the side that the suspension extends rather than gets compressed. My car suspension wise is totally stock. I do have a bassani mid-pipe and SLP cat-back. My wheel and tires aren't stock they are 18x9. Can anybody help me out. I have been trying to find the noise ever since I bought the car new. I would like to do suspension upgrades but I feel I should wait until I find out what this noise is. So Ford doesn't blame it on the mod's. I forgot to mention that the noise I'm hearing sounds like a slight thump or thud. Almost like something is extending all the way and then hitting a stop. I have heard something about a 12mm bolt being used rather than a 14mm bolt somewhere in the rear but not sure where or what bolt. Has anybody else heard this or know what I'm talking about? Thanks for any help Jeff __________________ SLP Loudmouth cat-back S.S. Bassani O/R X-pipe K&N FIPK II C/D and slotted rotors Hawk HPS pads S.S. Brake lines MM C/C plates MM Fr. & Rr. coilovers '00 R shocks Bilstein race valved struts KB rear shock tower brace MM Full Length Sub's Custom rear seat delete MGW Shifter Steeda Bumpsteer kit Steeda X2 Balljoints

02-28-2005, 01:01 PM	#2
Lumpydogs Registered User Join Date: Sep 2003 Location: Southeast Michigan Posts: 517	The wrong bolt issue is regarding the IRS bushings. I don't know if it affected the '03 & '04 cobras. Check out www.maximummotorsports.com and look up IRS bushings. There is more info. __________________ Lumpydog 2001 Cobra Coupe NA Mod Motor 329 rwhp 344 rwtq www.lumpydogmotorsports.com

02-28-2005, 01:43 PM	#3
sssvtcobra SCMC Member Join Date: Feb 2004 Location: Eugene, OR Posts: 441	Thanks, Lumpydogs I will have to check it out. Is there an easy way to check or to reach the bolts if I have access to a lift? It is the bolts that attach the IRS to the frame/body right? Does anybody have pictures of where these bolts are? Thanks, Jeff __________________ SLP Loudmouth cat-back S.S. Bassani O/R X-pipe K&N FIPK II C/D and slotted rotors Hawk HPS pads S.S. Brake lines MM C/C plates MM Fr. & Rr. coilovers '00 R shocks Bilstein race valved struts KB rear shock tower brace MM Full Length Sub's Custom rear seat delete MGW Shifter Steeda Bumpsteer kit Steeda X2 Balljoints

02-28-2005, 04:12 PM	#4
Lumpydogs Registered User Join Date: Sep 2003 Location: Southeast Michigan Posts: 517	Here http://www.maximummotorsports.com/in...MMIRSU-1r2.pdf __________________ Lumpydog 2001 Cobra Coupe NA Mod Motor 329 rwhp 344 rwtq www.lumpydogmotorsports.com

02-28-2005, 07:07 PM	#5
sssvtcobra SCMC Member Join Date: Feb 2004 Location: Eugene, OR Posts: 441	Just what I was looking for, Thanks I wonder if I could get my dealership to replace the bolts for free under warranty if they are infact the 12mm size. Maybe at the same time I'll see if they would be willing to put the polyurethane bushings in for me. My step dad used to work for them in the body shop, until he passed last month. He was very well liked down there. I'll have to get under my car tomorrow to see if they are 12mm or 14mm. Thanks, Jeff __________________ SLP Loudmouth cat-back S.S. Bassani O/R X-pipe K&N FIPK II C/D and slotted rotors Hawk HPS pads S.S. Brake lines MM C/C plates MM Fr. & Rr. coilovers '00 R shocks Bilstein race valved struts KB rear shock tower brace MM Full Length Sub's Custom rear seat delete MGW Shifter Steeda Bumpsteer kit Steeda X2 Balljoints

03-01-2005, 01:50 PM	#7
sssvtcobra SCMC Member Join Date: Feb 2004 Location: Eugene, OR Posts: 441	Thank you for the condolences. He's doing alot better now than what he was doing. He was in alot of pain just walking and getting up from sitting or laying down. Thanks, Jeff __________________ SLP Loudmouth cat-back S.S. Bassani O/R X-pipe K&N FIPK II C/D and slotted rotors Hawk HPS pads S.S. Brake lines MM C/C plates MM Fr. & Rr. coilovers '00 R shocks Bilstein race valved struts KB rear shock tower brace MM Full Length Sub's Custom rear seat delete MGW Shifter Steeda Bumpsteer kit Steeda X2 Balljoints

03-01-2005, 03:18 PM	#8
flynfink Registered User Join Date: Jun 2001 Location: Concord, NC Posts: 1,002	sorry but you gotta do something about this thread title.. __________________ Jeff F. AKA FlynFink 07' Porscha Cayman S 99' Rio Red Cobra Vert. #203 of 4055 94' Black Cobra Coupe #4971 of 5009 "Drive it like ya stole it"

03-09-2005, 01:57 AM	#10
deathrull Registered User Join Date: Mar 2005 Location: Bremerton WA Posts: 13	It probably is the front IRS bolts. I just put the IRS prothane bushing kit in and I had the wrong size bolts in the front. I had seen the warning on the MM webpage about the 03's but figured it was fixed for the 04's so I didn't order the bolts with the bushings. I was wrong So unfortunately they are still there till this coming weekend. But now I feel it clunk/shift when I take off and slow down. annoying for sure. To get access to them you have to drop the cat-back since they go through the frame. __________________ 2004 Mystichrome Cobra SS Bassani X-pipe, SS Magnaflow catback, prothane IRS bushings, prothane control arm bushings, prothane differential bushing, JLT CAI, Diablo tune, MM Full length sub frame, K-member X-brace, Steeda Triax shifter, Eibach Pro-springs, some chrome goodies, Cobra mats, 30% tinting, Cobra bra, SS Cobra bumper inserts. More to come

03-09-2005, 02:03 PM	#11
sssvtcobra SCMC Member Join Date: Feb 2004 Location: Eugene, OR Posts: 441	Thanks deathrull I am going to have my dealership take a look at it the next time I take it in for an oil change. Infact I just got back from there. I talked to one of the service writers that I've known for a long time and he said for me to just bring it in and they will take a look at it. He said they wil change the bolts out if they are in fact 12mm instead of the 14mm. I only hear the noise if I am pulling into or out of a slanted drive way. And depending on which way I am turning depends on what side I hear the noise. I don't hear when I speed up or slow down though. __________________ SLP Loudmouth cat-back S.S. Bassani O/R X-pipe K&N FIPK II C/D and slotted rotors Hawk HPS pads S.S. Brake lines MM C/C plates MM Fr. & Rr. coilovers '00 R shocks Bilstein race valved struts KB rear shock tower brace MM Full Length Sub's Custom rear seat delete MGW Shifter Steeda Bumpsteer kit Steeda X2 Balljoints

03-12-2005, 03:16 AM	#12
Venom55 Registered User Join Date: Feb 2003 Location: Greenville,SC,United States Posts: 141	I recommend getting the bigger size bolts but maximum does offer a urethane kit that has 12mm bolt size for the front mounts and 14's for the rear...that was the kit i used when i did the swap on my '98...btw, PITA as far as chaning out those rubber bushings to urethane. __________________ 98 Black SVT Cobra Mustang #551 of 5174. Engine Work: FRPP 9mm Wires, K&N, Spintech Mufflers, Off Road Dr. Gas X-pipe, MIL Eliminators, Steeda Tri-Axe, Tremec 3550, FRPP 11" HD Cobra Clutch, FRPP Alluminum Drive Shaft, 3.55 Gear Suspension: Bilstein Gas Charged Self-adjustable Sport Shocks and Struts, H&R Race Springs (Red), MM Castor/Camber Plates, MM Strut Tower Brace, MM Off-set Del-Alum Bushings, Urethane Spring Isolators, Sway Bar Bushings, End Links, '04 Cobra IRS, MM Urethane IRS Kit, MM Steering Shaft, Sub-frame connectors, Brembo 13" Slotted Rotors/4 Piston Calipers, Steel Braided Brake Lines, 18" FR-500B's, BFG KDW NT's R295/35R18+F255/40R18

03-12-2005, 02:06 PM	#13
sssvtcobra SCMC Member Join Date: Feb 2004 Location: Eugene, OR Posts: 441	So all four bolts are supposed to be 14mm, right? I think I am going to see if I can check for the size of them next week when I swap out my mufflers. That way I know for sure. Has anybody tried to get their dealership or Ford to replace these bolts with 14mm before? I think I am going to try to get them to replace them if they are 12mm. I still have another 500 miles before my next oil change, and thats when I am going to drop it off for them to look at it or possibly replace them if needed. Thanks for the replies, lots of help __________________ SLP Loudmouth cat-back S.S. Bassani O/R X-pipe K&N FIPK II C/D and slotted rotors Hawk HPS pads S.S. Brake lines MM C/C plates MM Fr. & Rr. coilovers '00 R shocks Bilstein race valved struts KB rear shock tower brace MM Full Length Sub's Custom rear seat delete MGW Shifter Steeda Bumpsteer kit Steeda X2 Balljoints

03-13-2005, 10:11 PM	#14
deathrull Registered User Join Date: Mar 2005 Location: Bremerton WA Posts: 13	Actually venom55 has them backwards. The front IRS subframe bolt is a 14MM and rear IRS subframe bolt is a 12MM. MM does sell the correct bolts for the front subframe but it sounds like you already have it covered through the ford dealership so that would be a lot less painful way to go. I would have done that if I knew I had the wrong bolts before I started. I did put the 14 MM bolts in yesterday and it was fairly easy but can't test them due to waiting on another install __________________ 2004 Mystichrome Cobra SS Bassani X-pipe, SS Magnaflow catback, prothane IRS bushings, prothane control arm bushings, prothane differential bushing, JLT CAI, Diablo tune, MM Full length sub frame, K-member X-brace, Steeda Triax shifter, Eibach Pro-springs, some chrome goodies, Cobra mats, 30% tinting, Cobra bra, SS Cobra bumper inserts. More to come

03-14-2005, 09:45 PM	#15
sssvtcobra SCMC Member Join Date: Feb 2004 Location: Eugene, OR Posts: 441	So how are the bolts supposed to be correct from the factory? Front=14mm Rear=12mm Or Front=14mm Rear=14mm Which ones are supposed to be 14mm and the factory is sometimes putting in 12mm? Sorry but know I seem confused for some reason Thanks Jeff __________________ SLP Loudmouth cat-back S.S. Bassani O/R X-pipe K&N FIPK II C/D and slotted rotors Hawk HPS pads S.S. Brake lines MM C/C plates MM Fr. & Rr. coilovers '00 R shocks Bilstein race valved struts KB rear shock tower brace MM Full Length Sub's Custom rear seat delete MGW Shifter Steeda Bumpsteer kit Steeda X2 Balljoints

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