Rich,
There's definitely no external difference between the two types of
three rail gearboxes... I've done the swap myself in my '70 Mk3.
They "stole" space for the synch equipment on the first gear from
the reverse gears, so no external modifications were necessary. This
made the gears for reverse narrower in the all synchro gearbox. Also
the "Reverse gear actuator" 114781 in the three rail top cover was
changed to the new design no 147394.
Boy was I puzzled before I went and bought the new actuator... ;-(
It was virtually impossible to engage reverse gear! Had to start over
again rebuilding the top cover assembly with the new actuator...
The question of exterior difference is _with_ or _without_ overdrive...
The propshaft is shorter _with_ overdrive fitted. But still the gear-
box itself is still the same.
Yours
/Odd
RICHARD.JACKSON@nene.ac.uk wrote:
>
> Andy wrote,
>
> >Right, Ron. Note that the Mk.IV and early (1973-74 U.S. version)
> >1500s use a variant of that three-rail box. It's pretty much the
> >same except for a synchro first gear and a larger output flange.
> >It, too, will bolt in by simply changing the driveshaft u-joint
> >flange to suit. Again, you are right in that the Mk.3 and earlier
> >Spitfire transmissions are identical.
>
> Aaah, but isn't the all-syncro D-type box slightly longer than the
> 3 syncro version therefore necessetating(sp) the shorter prop.....
> Ah haaaa, the Great Andy may have dropped a clanger<G> :-) :-)
>
> Rich
--
Odd Hedberg
Pomonagatan 4 International liaison secretary,
S-74236 Östhammar Triumph Club of Sweden
Sweden '70 Spitfire Mk3 FD82497LO Signal Red
E-mail: odd@triumphclub.se
Club URL: http://www2.passagen.se/triumph/
Home Telephone: Int+ 46-1731 7131
Geographical Position: N 60deg15min E 18deg23min
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