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CC Advertisers
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08-27-2007, 10:45 AM
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CC Member
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Join Date: Jun 2003
Location: Oakham,
Ma
Cobra Make, Engine: Kirkham 592
Posts: 578
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Not Ranked
Rear end ratios
I found a posi Jag rear for $250. I'm going to pick it up this weds. The guy thinks it's a 3:07? How would that work with a toploader? Anybody running one? How hard are the gears to change?
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08-27-2007, 11:49 AM
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CC Member
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Join Date: Mar 2006
Location: Buffalo,
NY
Cobra Make, Engine: Classic Roadster SC
Posts: 92
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Not Ranked
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08-27-2007, 04:51 PM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Meriden,
CT
Cobra Make, Engine: ERA 427 SC s/n 718, 428 FE
Posts: 1,731
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Not Ranked
Make sure it's what you want...many Jag (XJS) posi's are in fact 2:88's. If it's from an XJ6 or XJ12 you may be in business. To check, just turn the axle one complete turn and count the # of rotations of the pinion. Good luck. Also, it's worthwhile to rebuild the entire center section.
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08-27-2007, 05:25 PM
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CC Member
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Join Date: Jul 2002
Location: Greenville,sc,
SC
Cobra Make, Engine: Kirkham 427 (KMP 266); CAV GT40
Posts: 1,464
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Not Ranked
number one, make sure it is from the proper year, the later ones have big bolts protruding from the top for mounting and an aluminum rear cover, the proper ones have a flat top surface. 3.07, I think would be perfect for a toploader. The highway RPM's would be better and low end will suffer only mildly and be more controllable. I have 3.31 and would go to a higher ratio if I did it again.
__________________
SPF Daytona coupe 055, Roush 427R
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08-27-2007, 06:45 PM
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CC Member
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Join Date: Jun 2003
Location: Oakham,
Ma
Cobra Make, Engine: Kirkham 592
Posts: 578
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Not Ranked
Which year is recomende? Any pics of what the correct year looks like?
Thanks
chris
Last edited by ng8264723; 08-27-2007 at 06:48 PM..
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08-27-2007, 07:07 PM
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CC Member
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Join Date: Jul 2002
Location: Greenville,sc,
SC
Cobra Make, Engine: Kirkham 427 (KMP 266); CAV GT40
Posts: 1,464
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Not Ranked
you want the one at the top of the pic not the bottom one
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SPF Daytona coupe 055, Roush 427R
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08-27-2007, 07:23 PM
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CC Member
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Join Date: Apr 2006
Location: West Monroe,
LA
Cobra Make, Engine: Joey Manufacturing Inc.
Posts: 343
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Not Ranked
does anyone know who can work on these? i have one that needs to be freshened up.
__________________
"Me fodder was King Neptune, me mudder was a mermaid. I was born on the crest of a wave and rocked in the cradle of the deep. Me hair is like hemp, me arms are like spars. When I spits, I spits tar. I'm hard, I am, I is, I are. "
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08-27-2007, 07:35 PM
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CC Member
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Join Date: Jul 2005
Posts: 419
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Not Ranked
Try these people. I'm sure there are others.
http://www.cwiinc.com/ |
08-27-2007, 07:46 PM
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CC Member
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Join Date: Apr 2006
Location: West Monroe,
LA
Cobra Make, Engine: Joey Manufacturing Inc.
Posts: 343
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Not Ranked
thanks, i'll get in touch with them
__________________
"Me fodder was King Neptune, me mudder was a mermaid. I was born on the crest of a wave and rocked in the cradle of the deep. Me hair is like hemp, me arms are like spars. When I spits, I spits tar. I'm hard, I am, I is, I are. "
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08-28-2007, 03:05 PM
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Senior Club Cobra Member
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Join Date: Mar 2005
Location: Meriden,
CT
Cobra Make, Engine: ERA 427 SC s/n 718, 428 FE
Posts: 1,731
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Not Ranked
I used Curt Hamilton (Hamilton Automotive Ind., Van Nuys, Ca. 818 787 9695), whos reference came from right here on Club Cobra. Very reputable and reasonable.
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08-28-2007, 06:01 PM
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CC Member
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Join Date: Apr 2006
Location: West Monroe,
LA
Cobra Make, Engine: Joey Manufacturing Inc.
Posts: 343
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Not Ranked
i'll check on them too, thanks!
__________________
"Me fodder was King Neptune, me mudder was a mermaid. I was born on the crest of a wave and rocked in the cradle of the deep. Me hair is like hemp, me arms are like spars. When I spits, I spits tar. I'm hard, I am, I is, I are. "
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08-28-2007, 06:38 PM
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CC Member
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Join Date: Mar 2006
Location: San Marcos california,
CA
Cobra Make, Engine: 1989 KCC from South Africa Right Hand Drive
Posts: 1,605
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Not Ranked
I ran a 3.07 open diff for a long time,and recently changed to a posi 2.88.I like the difference a lot for the street,slightly more relaxed freeway cruising and to be honest 60+mph in first is great.Some of the jag center sections have a round pinion input flange,This is a Salisbury. Some have a rectangle ,like a Chevy which bolts the UJoint with a shackle,These are Dana rear ends.This now brings the choice of Dana versus Salisbury.I like the Salisbury becouase it has flat clutch discs as apposed to the "cone "clutch in the Dana.The Dana also has holes drilled in the disc to enable you to remove the caliper,where as the Salisbury does not need these holes.
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