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TR parts and Triumph parts, TR bits, Triumph Car Spares and accessories are available for TR2, TR3, TR3A, TR4, TR4A, TR5, TR6, TR7, TR8, Spitfire and Stag and other TR models are available from British car spares and parts company LBCarCo.

Triumph TR3 - TR-3A Gearbox Conversion

I have a '61 TR-3A with the 4-speed non-overdrive gearbox. I am looking to convert to an all-synchro overdrive gearbox.
Should I be looking for a TR-4 or TR-4A box, or is there a later model TR-3 gearbox which would suit?
What modificaions if any are required to switch to the different box?
Thanks for any suggestions.
Jim

A TR4a trans will fit, The only problem will be the speedometer drive. It ends up right over the crossmember. You will need the right angle drive.

I had a TR4a trans in my TR3. The shifter can be swapped with the current one. the TR4a used a bent shift lever, the TR3 is straight and shorter.
David Westlake

This thread was discussed between 23/10/2000 and 07/11/2000

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