This is getting posted to both lists. Apologies for the double whammy for
some. A collective thanks to those who quickly posted the method for
figuring out the differential ratios.
And, it works! I've got a Spitfire 4.11/1 in my overdrive GT6+ that
should have a 3.89/1. With that in mind, if I still had a speedo
calibrated for an overdrive, it should read 4.11/3.89=1.057 x actual speed
higher.
But, after some runs down by the Snake river between the mile markers
checking the actual speed vs speedo reading, it is actually 4.11/3.27=1.26
x actual speed higher.
Sigh.
Guess I have an overdrive car with a 4.11/1 rear end, and a 3.27/1 speedo.
I am going to get another differential. My question is, would it be too
naughty to get a 3.27/1 version so I get better top end performance? Am I
thinking about this correctly? I suspect that the higher ratios for the
overdrive cars were installed to prevent engine over-reving when the o/d
is disengaged.
I would be very happy to hear others' thoughts on the subject. Plus
possible trades/sources for a suitable differential.
Thanks!
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Jim Densley
61 TR4 CT757L
69 GT6+ KC54071LO
82 CB900F
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