1972 Triumph Spitfire Differential

Asked by Jul 06, 2017 at 08:50 AM about the 1972 Triumph Spitfire

Question type: Maintenance & Repair

I want a higher top end speed. I believe the final
drive that's in it is a 4:11. I have an additional rear
end with FK30859 stamped on it but can't find that
designation anywhere. What is it?

1 Answer


Open it up and count the ring gear teeth and divide that by the number of pinion gear teeth.

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