I caught this writeup and bookmarked it, its not in our stickies

Jaguar Quaife Differential Install – Jacks Transmissions LLC


You send these guys your rear end, you get the gears of your choice, new bearings,new posi, new drain plug, seals etc.

Don't know the cost for the options.

My question is, will a gear change change the speedometer, or miscalculate the traction control/abs unit in any way?

Id love to have some 3:55's or 3:73;s in the city.

 

Just found out its safe to upgrade the gears and also make the unit a posi from my local dealership

A good set of gears is in great need for the 4.0 DOHC, it will wake the whole car up.

This is definitely on my list of performance modifications, to go along with a cold air intake and performance exhaust.

Ive driven cars with gear swaps from 3.08, 2:73 changed to 3:73 and what a difference it makes!!!!, now with posi, you can conquer all that beloved thrust.

 

To the guy that emailed me, no this is not that difficult of a job, as other cars to just remove unit and ship out.Its on my to do list.