SWAP - Heavy duty alfetta suspension for low ratio diff ( ~ 3.5:1, from 2.5LV6?)

[tuntablejames]

Hi
I have several parts that may be of interest - a half race suspension kit, including sway bars, springs, torsion bars and shock absorbers for Alfetta.
They made the car quite stiff and the handling was superb.
Unfortunately, my current location has pot-holed dirt roads and the lowered stiff stuff is no longer useful to me.
I have built a hybrid based on alfetta parts, but I need a much lower diff.
I want something around the 3.5:1 area - I understand there are 3.42 and 3.55 ratio diffs for the transaxles. I have an 18% speedo error AND
a car that runs too many revs due to smaller tyres and lower weight. The card has been registered, but the RTA insists I must have power brakes,
so regretfully I am installing them. I didn't build the car for people with weak legs....
Swap anyone ?

James Fuller
tuntablejames@dodo.com.au