Jaguar 4HU power lock diffs

[Sonus]

I am looking into changing my stock Jag 3.31 Power Lock diff in my modified Vixen S1 for a 3.54 diff.
Would a diff out of a TVR 350i have been modified in regards to ramp angles etc? or would it be stock Jag?
Who in the uk would be able to alter a stock 4HU Power lock diff to suit a 980kg car? The stock settings are way to strong for such a medium light weight car.

Anyone got a 3.54 power lock diff going spare?

[Sonus]

Adrian@ said:

It NEEDS to be ramp rate changed...BUT IMHO you would never do this today, as a Gripper unit is the way to go.
Adrian@

By Gripper do you mean a LSD like Quaife? That would of course be the best, but hidiously expensive?

[Sonus]

Adrian@ said:

Yes. My turbo has a ramp rate changed 3.54 in ...most likely this is going to come out at some point to get a gripper unit put in...recently I looked for someone to ramp rate change an LSD, with no luck, it was cheaper to fit a gripper unit.
Adrian@

I'm in no hurry so let me know when you're changing diffs and I might take that diff off your hands

[Sonus]

Thanks Dollyman1850, Adrian and Slow M

I will look into it a bit more before I decide.