Davies William-qswi646 wrote:
> Brad,
> When I intended to do something similar with a Dolomite 1500 using
> an 1850 Overdrive box, I picked the brains of many including the ever
> helpful guru John Kipping. As the Dolomite 1500 uses the same single rail
> gearbox as the Spitfire 1500, what I learned will apply equally to your
> situation.
> The mainshafts are interchangeable between 1850 and 1500 single rail
> gearboxes, so the simplest solution is to take the mainshaft from the 1850
> box and build it into the 1500 gearbox, then everything relating to the
> overdrive should fit straight onto the 1500 unit. There is difference in the
> speedo drive gearing, but JK reckoned the difference would be negligible
> considering the (in)accuracy of the average Triumph speedometer!
> I hope this is some help. I never got around to doing this
> conversion myself as the Dolomite became surplus to requirements, and
> fatherhood left me with far less time for frivolous gearbox rebuilding!
> Cheers,
> ` Bill.
When you get finished with that, you are still left with the concern about how
to get a clutch disk that will fit the fine splines of
the gearbox. Since the Mk3 clutch and flywheel are different (flat flywheel
and smaller clutch, it is not a real clean job.
Hopefully, someone (try Ted Schumacher) offers a correctly sized disk with the
proper splines. Otherwise you may need to retrofit a
1500 flywheel and clutch to the 1296 engine. This is what I had to do on my
race car using the GT6 geatbox (but with different
splines)
I seem to recall that the flywheel bolts are different sizes between the two
applications, so if you go this route, you will likely
have to drill and tap the crankshaft for larger bolts, or sleeve the holes in
the flywheel. I don't recall whether or not the locating
pin is the same but wouldn't be surprised if it is different.
ANyway, good luck.
Joe
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