my 1972 mkIV has a diff with 4.11:1 ratio. i thought, that the
3.89:1 was only in the 1973+ US model years and for UK mkIV, and the
3.63:1 was for the UK 1500 models.
--- "Terry L. Thompson" <tlt@digex.net> wrote:
>
> I was looking at the short thread on "Hopped-up Spits" and a couple
> of
> people had mentioned their differential gear ratio, and I could
> have SWORN
> that the early Spitfire Four to Mark 3 had the "fast" differential
> and that
> the later 1500's had the "slow" (more rpms) differential.
> But after looking at my "guide to originality" it looks like I had
> it
> backwards. Spitfire 4 to Mark III had 4.11:1, the Mark IV had a
> 3.89:1 and
> the 1500 had 3.69:1
> I'm going on the assumption that the ratio is the number of drive
> shaft
> turns per axle turn, as my Ford F5 has a massive 12" differential
> with a
> 6.75:1 ratio which supposedly gives it some really good torque.
>
> Someone want to clear this up for me?
>
> By the way, Thanks for all the advice on that square headed oil pan
> screw.
> The knucle-buster (adjustible crecent wrench) did the trick. And it
> appears
> to be an 11mm square head. I thank you and my car (no name yet)
> thanks you.
>
> -Terry L. Thompson
> '76 Spit 1500
> Maryland
>
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