The TVR's with TR 6 rear suspensions used the 3.45 gears.
JVV
----- Original Message -----
From: "Jamie Palmer" <tr6driver@earthlink.net>
To: <6pack@autox.team.net>; "triumphs" <triumphs@autox.team.net>
Sent: Tuesday, September 28, 2010 4:12 PM
Subject: [TR] Euro or other taller differential needed
> RiffRAF Racing is in need of a TR6 differential with a taller rear end
> ratio (i.e. numerically smaller) than the stock 3.7:1 US setup. One
> possibility would be the 3.45:1 from a PI car. We're open to other
> suggestions, but since our car is supposed to be worth no more than $500
> by the rules, some of the more common (for example, the GoodParts
> conversions) are out of our reach.
>
> Anyone got a Euro diff around?
>
> The car is at max RPM way early on straights. For example, we were at the
> rev limit for the entire front straight at Roebling Road, and were
> actually driving the entire course in 4th gear. Even at Sebring last
> weekend, when our engine was entirely off song, we could hit max RPM
> really quickly.
>
> An overdrive would push the car past the race series value limit, and
> while taller tires would help, they would also hurt the handling
> considerably (we're currently using 205/50-15 Falken RT615K's on stock
> wheels due to treadwear rules and wheel cost rules).
>
> All suggestions are appreciated...thanks.
>
> Jamie Palmer
> RiffRAF Racing
> 1975 TR6 ChumpCar
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