John wrote:
Date: Wed, 20 Jul 2005 21:00:06 +1200
From: "John Kipping" <johnkipping@inet.net.nz>
Subject: Re: TR7 vs GT6 4 sp gearbox info
Hi Terry,
The 4 speed TR7 box is identical in ratios to the GT6 therefore the teeth
counts are identical. However most TR7 boxes had thick tooth reverse gears,
and the last few had a sharper helix angle on second gear.
John Kipping
- ----- Original Message -----
From: "Terry and Cindy" <roadandtrack@hypermax.net.au>
To: <fot@autox.team.net>
Sent: Thursday, July 21, 2005 5:06 AM
Subject: RE: TR7 vs GT6 4 sp gearbox info
> does anyone happen to have a 4speed TR7 box in bits??
>
> i would like a gear tooth count if possible.
>
> I built the gearbox in our old GT6 racer from new (specially imported) TR7
> bits many, many years ago and would like to build up a spare, but want to
> double check this first before I start hunting down parts
>
> we never got the 4sp cars here in Australia (thankfully), so I've only
seen
> a couple of them and never bothered saving the data on teeth numbers
>
> if any of the GT6 racers are reading this, do you have any comment??.
>
> thanks a lot
>
> Terry O'Beirne
>
>
Hi Terry,
I have a list of ratios here:
TR7 4 speed from Jan 75:
1st: 2.658
2nd: 1.782
3rd: 1.256
Reverse: 3.98/3.05
GT6: (all)
1st: 2.648
2nd: 1.78
3rd: 1.257
4th O/D: 0.802
Reverse: 3.098
John is most probably correct, the figures on my list - drawn from a number
of sources may contain typographical errors accumulated over the years...
Regards
Lion
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