[TR] O/D safety switch

Andrew Uprichard auprichard at uprichard.net
Sun Aug 31 17:17:47 MDT 2014


Yes, but if you are on a tight winding road, it's fun just to kick the car
in and out of overdrive in third rather than shift up and down.

Andrew Uprichard

-----Original Message-----
From: Triumphs [mailto:triumphs-bounces at autox.team.net] On Behalf Of Randall
Sent: Sunday, August 31, 2014 6:43 PM
Cc: 'Triumphs'
Subject: Re: [TR] O/D safety switch

> this allows only using O/D in 4th
> gear.. better than nothing I guess..

Just a SWAG, but the GT6 used the D-type OD which was marginal even behind
the much smaller Spitfire motor.  My _guess_ is that they limited it to 4th
gear because the OD could not handle the engine torque multiplied by the 3rd
gear ratio.

I don't know how the ratios work out on the GT6, but on the TR2-6, 3rd OD is
so close to 4th direct that it's almost not a separate gear.  That's not to
say 3rd OD is totally useless, but it's also not a big loss, IMO.

Randall

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