I have an overdrive in my 1972 2500, so the 3.45:1 was overkill. This is why
I think the 4.3 will be okay on the street. If you look in the back of the
Vizard Triumph tuning book, it shows all the various rear end ratios and
engine speeds by gear, with or without overdrive. Very useful.
The A type was a bolt-in. I installed it with the engine in place, which
made the job really tight (damn near impossible, as I recall). The emergency
brake bracket needed to be spaced over a bit and bent to give decent
clearance. When you go looking for an overdrive, remember that the the rear
mounting bracket on the J-type is in a different location, so modifications
are called for.
I found the 4.3 locally. It had been built for racing with new ring, pinion,
and differential gears, but never been used. This ratio was never stock in
TR6. I heard they were used in Triumph Vanguards, but I am not sure about
that.
Stephen
> ----------
> From: Ljbtvr@aol.com[SMTP:Ljbtvr@aol.com]
> Sent: Saturday, August 05, 2000 5:24 PM
> To: Hill, Stephen M EDUC:EX
> Subject: Re: Differential
>
> In a message dated 00-08-04 20:01:56 EDT, you write:
>
> << I have a 3.45 in my car. I also have a couple of 3.7's. But I want to
> slalom
> the car and bought a 4.3. It may be that the car would be fine with the
> 3.7,
> but decided that if I passed on the 4.3 I'd never come across another
> one.
> Am I nuts?? What was the car like with the 3.7, and why did you go back
> to
> the 3.45? >>
>
> I have both autocrossed and hillclimbed the car here in PA although I have
>
> taken the last few years off. I intend to be hillclimbing again sometime.
>
> Actually, installing the Quaife was one of the things I've done to the car
>
> after I stopped (along with a rebuilt engine) so I have never driven it in
>
> this form. I put the Quaife in because of the Weatherly Hillclimb where
> the
> car would just spin the inside wheel on that hill's three switchback
> turns.
>
> The TVR was never intended to be my primary racecar- just a modified
> street
> car. The 3.7 was fine for the hillclimbing events I ran with it but I
> will
> be driving this car on the street and I'd like to have the better top end
> the
> 3.45 gives you. That is- unless I can locate a reasonably priced OD
> trans-
> then I'd probably put the 3.7 back in. Where'd you find a 4.3?
>
> I have a GT6 that I crashed at the Duryea Hillclimb 6 months after I
> bought
> the TVR. The Triumph is extensively modified (gutted, slicks, lowered,
> etc.)
> and will be my primary racecar when I finally get it repaired.
>
> Larry
>
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