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02-08-2010, 06:43 PM
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CC Member
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Join Date: May 2009
Location: Pittsburgh,
PA
Cobra Make, Engine:
Posts: 85
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Not Ranked
IRS question - would this work?
I saw a 1982 jag xj6 for dirt cheap and had a thought. My sons want me to buy it so they can take it apart, but I know it has an IRS. Can this be used on a cobra kit? If so, they could sell some parts and put the money towards our cobra project.
So will this IRS unit work for a cobra? Any help or thoughts would be appreciated.
Pete
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02-08-2010, 06:55 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
The major components can be used but you'll find the XJ6 rears are too wide for a Cobra. The axles and lower arms can be shortened but that needs to be done professionally and can be costly.
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02-08-2010, 07:19 PM
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CC Member
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Join Date: Apr 2005
Location: Tucson,
AZ
Cobra Make, Engine:
Posts: 5,391
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Not Ranked
Does that have a 4HU Nick?
Larry
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02-08-2010, 07:39 PM
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CC Member
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Join Date: May 2009
Location: Pittsburgh,
PA
Cobra Make, Engine:
Posts: 85
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Not Ranked
I believe it has a 4hu but the track is 58".
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02-08-2010, 07:46 PM
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Senior Club Cobra Member
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Join Date: Sep 2000
Location: Holderness, NH, US of A,
NH
Cobra Make, Engine: CSX 4772 old iron FE
Posts: 5,499
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Not Ranked
Yes the pumpkin is the same casting the 4HU. The other problem with the XJ6 rear is the open rear end and the tall ratio probably 2.88. A 5 speed would be really the deal in front of it. Track is about 52 on the XKE.
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02-08-2010, 07:47 PM
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CC Member
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Join Date: May 2009
Location: Pittsburgh,
PA
Cobra Make, Engine:
Posts: 85
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Not Ranked
Wow, that is quite a difference. Maybe I should just stick with buying the one that comes with the kit.
Thanks so much for the input!
Pete
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02-09-2010, 06:16 PM
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CC Member
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Join Date: Oct 2003
Location: Golden Isles,
GA
Cobra Make, Engine: Butler Cobra. 350 Chevy Engine, blueprinted, heads cc'd, ported, polished, manifolds matched, big valves, 1.6 roller rockers, TB Injected, mild cam, MSD crank trigger electronic ignition. TKO-600 transmission. XKE Jaguar rear. IFS by Fast Cars
Posts: 558
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Not Ranked
Quote:
Originally Posted by PJ4myboo
Wow, that is quite a difference. Maybe I should just stick with buying the one that comes with the kit.
Thanks so much for the input!
Pete
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Hi Pete, When I built my cobra I got a complete XJ6 rear end. It was a 3.31 ratio. You can tell ratio by looking at the metal tags that are attached to the diff cover. I sent my control arms to Ron Butler, Cobra builder, now Retired, and he shortened them for me. See my IRS photo in my Album.
I spoke to Ron today and he will shorten both the control arms to the XKE specifications for $200 + shipping. He also has the correct half-shafts for sale at $250.00 for the l & R pair. Seems like a fair price to me.
Ron is a gentleman to deal with and his work has always exceeded my expectations. He is in California, call him he said he would be happy to take care of you. 805-649-6000 He was one of Carroll Shelby's crew in the hay-day of Cobra racing. Please tell him that Arthur Mitchell referred you.
Last edited by lal Naja; 02-13-2010 at 12:57 AM..
Reason: Typo
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02-10-2010, 12:44 PM
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CC Member
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Join Date: May 2009
Location: Pittsburgh,
PA
Cobra Make, Engine:
Posts: 85
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Not Ranked
Quote:
Originally Posted by lal Naja
Hi Pete, When I built my cobra I got a complete XJ6 rear end. It was a 3.36 ratio. You can tell ratio by looking at the metal tags that are attached to the diff cover. I sent my control arms to Ron Butler, Cobra builder, now Retired, and he shortened them for me. See my IRS photo in my Album.
I spoke to Ron today and he will shorten both the control arms to the XKE specifications for $200 + shipping. He also has the correct half-shafts for sale at $250.00 for the l & R pair. Seems like a fair price to me.
Ron is a gentleman to deal with and his work has always exceeded my expectations. He is in California, call him he said he would be happy to take care of you. 805-649-6000 He was one of Carroll Shelby's crew in the hay-day of Cobra racing. Please tell him that Arthur Mitchell referred you.
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Hi Arthur,
Thank you so much for the tip. I will certainly give Ron a call and see if we can make it work! |
02-10-2010, 02:00 PM
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Senior Club Cobra Member
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Join Date: Nov 2003
Cobra Make, Engine: ERA #698 428 Toploader
Posts: 292
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Not Ranked
If you buy a kit from E.R.A. they will shorten the arms and shafts to the correct size for free.
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02-10-2010, 06:09 PM
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CC Member
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Join Date: Apr 1999
Location: Waco, TX,
TX
Cobra Make, Engine: ERA #766, FE V8, Toploader
Posts: 257
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Not Ranked
Actually, ERA will do this if you buy their mounting frame for the XKE/XJ6-based inboard-brake rear drive and suspension. (XKE Series I and II control arms and halfshafts do not need to be shortened, but the later series do.)
I thought it was a good deal, and I'd do it again.
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