On 28 Aug 2003 at 13:58, Douglas Frank wrote:
> And, the speed gear ratios are wrong.
Which calls to mind another thing to consider. In the Spitfire, cars
with OD had the same diff as those without OD, so the OD gave you a
higher gear for the highway and a bit more shifting versatility. On
the GT6 they did things differently. (Lemme' see if I can get this
straight.) Cars destined for non-US had the same diff (3.27:1) with
or without OD, which gave "ridiculously high gearing". US OD cars
had a lower (numerically higher, 3.89:1) diff, so you ended up with
similar highway rpms but lower gearing when OD was off, which
translated into slightly better acceleration and lower shift points.
Now, if you do your own OD swap you don't have to follow these rules,
of course. But you probably won't be able to use factory-standard
components such as speedo drive and such. Instead, you'll have to
find your own solutions. As Doug pointed out, at the very least your
gears will be way too low. So you'll probably want to swap the diff
to something geared higher, which will change the speedo readings
too. Seems like it would be easier to find a GT6 OD gearbox (or
convert your own) and go with the Euro-style high gearing.
--
Jim Muller
jimmuller@pop.rcn.com
'80 Spitfire, '70 GT6+
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