Thanks for the information and advice Bill. Highly appreciated.
Chris de Wet .
" South African home for unwanted and neglected Triumph cars and parts " :-)
PO Box 472 , Ifafi , 0260 , South Africa .
'56 TR 3, '62 Herald 1200 Coupe, '64 Spitfire 4 (Mk1), '65 Spitfire 4 (Mk2),
'67 GT6 (Mk1).
'63 Vitesse 1600 Convertible (HB 8346 CV) ....... possibly soon?
My Spitfire6 project: Spitfire(Mk2) body, GT6(Mk1) bonnet & doors, GT6(Mk1)
chassis/brakes/suspension, GT 6 (Mk 1) engine, 2000 Saloon gearbox with
overdrive and Vitesse 3.89 differential.
-----Original Message-----
From: William Davies [mailto:bill@rarebits4classics.co.uk]
Sent: Wednesday, 05 November, 2003 12:57
To: Chris De Wet; jim williams; triumphs@autox.team.net
Cc: spitfires@autox.team.net
Subject: Re: 13/60 Vitesse Clone
> I have been advised that the Vitesse/GT6 gearboxes are weak, prone to
> failure and troublesome. It WILL apparently fail if you put more than
> standard torque through it or drive in a 'spirited' fashion. It will not
> last with any performance increases.
WHile the gearbox is certainly weaker than the big saloon box, I know
several owners of 2.5 litre engined GT6s who've not had problems with the
standard gearbox. The diff on the other hand IS a problem, certainly the
weakest link in the chain.
> Apparently 3.63:1 is "the best" diff ratio to use with the 2L GT6 engine
and
> saloon o/d gearbox (possibly even with the standard Vitesse/GT6 o/d
> gearbox). Unfortunately I have no idea where one could obtain such a
3.63:1
> differential, but the guts from a TR7 four speed diff is 3.63:1 and could
> possibly be transplanted into a Vitesse/GT6 diff casing. Anyone any ideas
or
> comments ?
The early TR7 axle is I believe essentially the same unit as used on the
non-Sprint Doomites. If that's correct then the diff assembly is very
similar to the later Spitfire type. From memory there is an additional
fixing hole which needs to be drilled in the nose-piece (can't remember the
specifics) but the internals are the same.
Cheers,
Bill.
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