Diff ratio for Spit Mk IV w/OD

["M D \"Doc\" Nugent" <docnugent@yahoo.com>]

I have a Spit Mk IV (FK series, year unknown) parts
car with overdrive - should it have a 3.89:1 rear end
like some of the non-overdrive Mk IV's do, or a 4.11:1
like other non-overdrive Mk IV's do, or something
else?

The Mk IV w/OD combo isn't listed on
www.triumphspitfire.com/diff.html

M D "Doc" Nugent 

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