Triumph Repair: triumph speed, triumph 1500, overdrive transmission

Question
I have a Triumph 1500. On the Highway, I rarely do 65mph due to the high revs of the car. Is there a way to decrease the revs AND/OR increase the speed of my triumph? Hopefully these can both be tackled with a single operation.
Thanks Benjamin McKay

Answer
Benjamin,

How much do you want to spend?

There are two options with the stock drivetrain.  Either locate a 3.27:1 differential from a GT6 or an overdrive transmission for the Spitfire.

The GT6 differential will slow your acceleration in all gears but will tend to be cheaper than the overdrive unit.


Cheers,

Jim