Hi Martin,
I believe it was only in certain markets that the diff ratios were changed
when o/d was fitted. Unless you want extra acceleration I would recommend
keeping the taller ratio diff. I have a 2000 saloon which is supposed to
have a 4.1 ratio axle, against all the best (by which I mean from very
knowledgeable sources whose opinion I value) advice I fitted a 3.45 ratio
axle, I lost a bit of acceleration, and didn't gain any top speed but when I
hit 90 I am no longer at the red line, there is just is not enough power to
push the brick any faster! As the engine is basically the same in both these
vehicles I would think you will be good to go!
Graham.
----- Original Message -----
From: "Martin Secrest"
Subject: Diff Swap: GT6 3.27 for Spit 3.89
> I'm converting my GT6-3 to overdrive, for which I'll need a 3.89 diff.
>
> I've got a good, rock solid 3.27 in my car now. No whine or lash. If
> you have a like unit from a later Spitfire that you'd like to trade
> straight up, send me a private message. Thanks ..
>
> --
> Martin Secrest
> Arlington, VA
> '73 GT6
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