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Thread: Less clunk with 14mm bolts(pics)
04-11-2009, 02:53 AM #1
Less clunk with 14mm bolts(pics)
Got these 14mm IRS bolts from WS6JJP(John). I became sick of the clunking in the rear and decided to give the bolts a try.
Compare the stock 12mm to the 14mm that should have been installed from Ford
Place jack stand under car to support and gently support the IRS with jack
Bolt comes out so easy as if doesn't even belong there
Finally done and it took about 1.5hrs total including taking pics and a beer or two. Next time it would take half the time.
Much less clunking than before but not entirely gone. It was worth it to do for the negligible cost IMO. Probably need all bushings replaced with delrin and it will be near perfect.Whipple 2.3, SCT BA3000, FRPP 60 lb injectors, BF T/B, GT pumps, MGW orange , Mac 3" catback, PPRV delete, Evenflow coolant mod, M/T 315's on chrome 10.5" reps.
04-11-2009, 09:24 AM #2
cool man.so where can i get a set?
also they gonna fit trough the original holes or i have to enlarge them??
Last edited by 04redfireRO; 04-11-2009 at 09:26 AM.
04-11-2009, 09:34 AM #3
I got them from a member here (WS6JJP) but Ford and Lethal also stock them. You do not have to enlarge the bolt holes. Easy and cheap mod
04-11-2009, 09:35 AM #4
04-11-2009, 10:12 AM #5
having trouble gauging the exact location - any more pics? or arrows? Thanks!03 Mineral Grey Vert Lemoned #527
Built 6/24/02 1 of 154
03 Redfire Vert #3518 of 5082
Built 4/17/03 1 of 610 (403 with my color combo)
Other ride- 2013 300 SRT8 , White with the black chrome package. Big and Bad
04-11-2009, 11:03 AM #6
04-11-2009, 11:07 AM #7
This is from the driver side. Bolt is located just forward of the rear tire. I didn't have to move the exhaust to get the bolt out.
04-11-2009, 11:24 AM #8
WS6JJP and I did mine last year too. Big difference
04-11-2009, 11:27 AM #9
I'm looking at the MM Low Profile IRS bolts on Lethal right now but it doesn't say if they're 14MM, anyone know? I'd hate to get them here only to find out they're still a 12MM
2003 10th Anniversary Coupe, black. The road course whore, too much to list.
2013 Shelby GT500, SVTTP, SVTPP, black w/stripe delete, Recaros, and all audio upgrades. Bob's oil separator with Earl's AN lines. 50th Anniv. Alcoa's on order, MRT hood struts. Delivered 6/16/2012
04-11-2009, 11:54 AM #10
04-11-2009, 12:13 PM #11
So the front bolt is the one that had the sizing issue, the rear size is ok other than needing the low profile bolt for wider tires?
04-11-2009, 01:33 PM #122003 10th Cobra
Built Teksid, twin MP 64s, e85
#1923 of 2003 10th Anniversary Cobras
Build under-way: 5.3l Boss big-bore stroker and Precision snails!
2008 Jeep Grand Cherokee CRD 4x4
DD and tow pig
2008 Infiniti FX35
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04-11-2009, 02:16 PM #13
Thanks for the write up, I never knew exactly where that bolt was located but heard a lot about it.
04-11-2009, 02:46 PM #14
just order ac427cobra's (bruce) full bushing kit and 14mm bolts in one shot. There will always be a little drive slop but you'll cure 99% of it and also 99% of wheel hop.2013 boss 302
2013 exploder sport
2011 F150 ecoboost platinum
04-11-2009, 02:52 PM #15
- Join Date
- November 2006
Not all Cobras have the wrong bolts.
04-11-2009, 06:43 PM #16
- Join Date
- March 2008
I have been waiting to do my irs bushings and 14mm bolts. Thanks for the pics
04-11-2009, 07:04 PM #17
04-11-2009, 09:23 PM #18
I would give that about a coin flips chance of being correct. Who knows if they actually checked or even knew what they were talking about.
I have done a bunch of the bushing mods, diff brace, low profile IRS bolts. Pretty much everything except the DSS Level 5's.
I will have to check one of these days myself to see what is down there. Thanks to the poster for posting this thread and pics of where those are located.
Last edited by 03SBGT; 04-11-2009 at 09:24 PM.2004 Silver Cobra Coupe
Whipple 2.3 (140ax)
600/541 SAE @ 17#'s
Brembo Cobra R's
AFS Chrome 18"s
04-12-2009, 07:38 AM #19
04-12-2009, 09:18 AM #20
ive read that you can check bolts with a wrench on threads...but if its only on some cobras,what was the reason?
wrong bolts first?
ran out of bolts,than used 12mm?
my question,,what number cobra are you?
im #1815 aug 02
than clunk is less,wheel hop is less...how about tire spin and side to side wiggle...ive got this problem and its bugging me...anytime you try to go faster,wheels spin,,and yes thats with trying to feather it,,with new tires i get about a week of no spinning,,
ive got 373`s...also im using the new bfg sport
04-12-2009, 09:26 AM #21
04-12-2009, 09:36 AM #22
04-12-2009, 09:38 AM #23
- Join Date
- November 2006
In hindsight clearly the wrong decision!
04-12-2009, 10:41 AM #24
This is en easy and inexpensive fix. I'm glad to help out any SVTP members as I've learned tons here about these cars.
04-12-2009, 11:36 AM #25
yea, ,my clunk is pretty much gone after installing the 14 ml bolts.