Barry et al,
With reference to the below;
>also consider changing the rear end to the 3.89 diff that overdrive
>equipped cars had as the 3.27, which is what most of the non-overdrive cars
>had is a little tall for overdrive (ask some of the British listers if they
>like their's as I believe some of the UK spec overdrive cars had 3.27
>ratios), plus you get the added acceleration that the lower gears provide
>coupled with relaxed highway cruising.
I have an overdrive box, and the 3.27 diff, in the GT6+. I don't have the
advantage of the low gearing for the initial acceleration - however for
highway cruising the extra long legs are very nice (about 65mph at
The GT6 (in non strangled form) has plenty of punch to cope with the gearing.
The combination of the 3.89 and o/d just gets you to the same gearing as
the non-o/d cars at the top end (of course with lower intermediate gearing).
Bill and Sal Birney
'67 Spitfire MkII - Under resto
'70 GT6+ (RHD)