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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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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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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.
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Which year is recomende? Any pics of what the correct year looks like?
Thanks chris |
you want the one at the top of the pic not the bottom one
http://i48.photobucket.com/albums/f2...66/diffjag.jpg |
does anyone know who can work on these? i have one that needs to be freshened up.
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thanks, i'll get in touch with them
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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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i'll check on them too, thanks!
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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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