Is the good ol' Sierra diff sensitive to power inputs? If so, what are it's 'usual' parameters

i know GBH geartech are building a Aston DB2 with something like 350 bhp and loads of Nm going into a 3 inch prop with a boggo 3,62 sierra LSD

How much power are you talking about?

A Cossie diff must be fairly capable

400-ish?

7" or 7.5" ?

and are you using the rear mounting ? (the one that the se7en's don't normally use)

There are plenty of high powered RWD cossies around, most are just using the standard 7.5" LSD that they came with as far as I know