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I am not 100% sure about this but I believe that all the Salisbury diffs used in all Jag IRS are the same (the parts are interchangeable) with one exception: at some point they changed the way the pinion is located from shims to a collapsable (sp?) spacer. I am not sure whether for this they changed the pinion shaft or the casing or both.
I have a 3.31 rear and top gear on the ZF five speed is 0.98:1. This set-up is still pretty tall and I would go for a 3.54 if I did it again.
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Cheers
Myles D-W
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