I agree with snapper, you can always upgrade later.
My Xr has the T5 from a Mustang (not the best of ratios, but lots available in the scrap yards.) You can also upgrade it to the Cosworth ratios and higher torque specs. (available off E-bay, for approx $450:00US if I remember correctly, I have that info if required.) I Just had to aquire the Turbo Coupe bell housing to mate it to the 2.3L block.
Because I have 2 spare T5 boxes, one will be installed in the kit car.
MC2 racing also does a conversion to convert the Stock XR diff to a Chev LSD type diff for approx $500:00US. (The internals fit into the Xr diff casing.)
The Toyota Supra LSD diff could also be an option. This diff can be made to work in the Xr, so it should be possible to make it fit the Kit car. This diff has a few ratio options I believe.
cheers,
Bill.
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