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So my question is what goes in to swapping the diff from a cobra or markviii and what years of these cars can i pick from?
 

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Any year MarkVIII will work, but they are all open diffs, so you would need to get an IRS trak-lok unit. For cobras, any 99-04 housing will work, but 99 was the only year that had the 28 spline axles, which you need, so if you get an 01-04 cobra housing you will need to replace the spider gears with 28 spline IRS trak-lok ones.
 

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'99 Cobras are 3.27's w/28 splines, the only diff that is a straight swap.

'01 Cobras are 3.27's but with 31 splines.

'03 and '04 Cobras are 3.55's with 31 splines.
 

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no so id need different gears ?
it says 28 spline mustang so i was thinking cobra 99 28 spline irs
is there any other mustangs that have 28 splines that arent irs
 
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