Hi, having now got the car on the road I now find out just how low the 3.89 diff is, and I don't think 3.54 (~9% increase) will be high enough to make the difference(yes, I know, I need to do some simple sums!). Does anybody know if there are higher ratios available for said axle, or even if it is possible to bastardise other diffs/gears to fit? I'm looking at going de-dion otherwise with a Sierra diff. Any knowledge guidance gratefully received.
Cheers.
ps. Have 3.89 diff in good nick to sell/swap!