After getting the std brakes off the car it is obvious that the std spindle is going to be way to small being 17.4mm at the front and 25mm at the rear with two flat sections and a taper in between. The std FD HUB is a uniform 32.5mm so a sleeve will need to be made up to fit over the 323 spindle. To this end I've been working in Solid Works to CAD up a design for the sleeve. I will use an M33 3mm thread on the end to secure it and will be TIG welded to the standard Spindle.



I have a Ford 8.8 inch diff from a EF/EB Ford Falcon with a Limited Slip Differential. I want to shorten it down to suit the 323. Due to the RX7 LCA in the front, the front tyres(205X50X15) now protrude from the front guards by 65mm. Making the overall front track width 1,675mm. With 225X50X15 tyres on the rear and the standard diff the rear is 1,610mm. Meaning that the rear track width is 32.5mm narrower on each side. To widen the rear when I shorten it, I'll make the rear axle 65mm wider than the standard rear axle. The standard 323 Diff width is 1,338mm and the Ford 8.8 is 1,547mm for a total difference of 209mm. So the Diff needs to be shortened by 209mm - 65 = 144mm or 72mm per side.
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