Someone has suggested using a scoobie rear diff as the diff on a Caterham or other Se7en clone. Caterham and Westfield at present use a 7 inch Sierra diff and it's a bit of a monster, both size and weight wise. Can anyone answer some questions for me:

What ratios are available? I know of 3.9, 4.1 and 4.4, the latter presumably only on 112mph limited JDM machines.

What diffs come with these? I know of viscous on some and AP suretrac on the current STi's but I'm not sure which have viscous rear diffs or if there are any other slippers offered, plate type perhaps?

What do they weigh?

How big are they compared to the Sierra diff, hard one there...

 

ive just took the rear end complete out of my legacy and its fookin heavy

the diff itself looks bigger overall than a sierra diff may not be as wide though

 

Hmm Sierra diff is fookin heavy too. So on that subjective note little advantage...... Bummer. Thanks anyway.