Diff ratios, and rear wheels sizes on FD\'s

[Chris Wilson]

I am putting a Swedish made Tractive sequential gearbox in my FD and  need to order the right ratios and drop gears for it. What freely  available diff ratios are available for these, and are all the crown  wheel and pinions as strong? I would probably run a Giken LSD on this.  As an aside, what\'s the  widest rear rim and tyre package that will go under the stock arches and  allow full unimpeded suspension travel without tyre fouling? I have a  customers Feed bodied FD here on 10 inch rear rims, but the steel arches  looks considerably altered beneath the glass fibre extensions. Can you  get a ten inch rear rim and suitable tyre under stock steel wheel  arches? Thanks.

[skybusr34]

10" will fit under a standard arch yes

[ad4m1]

FD standard diff ratios are:


auto: 3.9
manual: 4.1
RZ/RSR/RS: 4.3

think you can fit rx8 CWP into an FD casing which can come in  4.7 i think