Complete selection of differential final drive ratios plus all the couplings for all 1959 thru 2000 models. Starter, starter solenoids, Alternators and Generators also available for the same models. Technical information is available on line or on the phone.
The standard diff unit’s componentry falls well short in the performance stakes. As an absolute minimum you should fit an up-rated diff-pin - whether this is because your racing regs don’t allow alternatives, or merely for the road - along with new planet-wheels and thrust washers.