Brooklands

Thank you for the advice and comments. Nick, good point about state of tune, driving style and what I intend doing with the car. I know that the GT6 box is marginal, but I believe it will be fit for the way I use the car. It also suits the idea behind the build. Although it's a hybrid, I would like to keep it all Triumph and contemporary with what could have been done at the time (1972). I really admire those who significantly re-engineer their cars for racing (or for personal satisfaction), but I just don't have the skills required. The engine build is to sensible "fast road" spec. running on HS6 carbs. I'm not looking for ultimate performance as it's a road car not a race car. My driving style is smooth these days, but I would like to be able to do the odd track day, and I do want it to pull away from the lights well. I will not be reving it till the valves dance on the bonnet before dropping the clutch. Interesting point about the ratios in the saloon box. Heard of others doing this swap, but the ratios don't appear to be considered, only the strength. I've read about mods to the mainshaft tip and two different hardening processes? Any more detail on this? Gareth, you say this is what you did for years, and you quote a list of new parts you bought the last of. Do you still do this work, and do you still have new parts for sale that I will need to have a strong gearbox built? On the subject of who could do this work to a high standard, Mike Papworths name comes up in gearbox threads pretty regularly, but opinions are mixed. Some think he's a gearbox wizard, while others have commented that the only thing he does to recon a gearbox is to wipe the crud off the outside. Gareth, I appreciate your professional opinion on the gearbox build spec. and I have already read your comments on Mr Papworth in other threads. Anyone got personal experience of running a modified gearbox built by Mr P, either good or bad? Who else do the tuners and racers use to build Triumph gearboxes? What are your experiences? Thanks again for all the help.

Hi, I'm well on with a Spitfire 6 / GT6 2.5 convertible build and would like some advice about strengthening the GT6 gearbox. I suspect many will ask why I'm not fitting a saloon box or a five speed, so let's deal with that first. I don't want to cut the chassis, or mod the gearbox tunnel, and although many say these conversions are easy, just as many say they are not. Recent reading on the net also suggest the 5 speed ratios are not good for the GT6. That's one of the problems I have with making my choice. I'm finding lots of conflicting opinion (some of it strong) about the subject. It can't all be correct, as the opinions are often in direct oposition to each other. So, I'm sticking with the GT6 box and my question is this; - What's the strongest build spec for an OD GT6 gearbox, and who can do this work to a high standard? I'm UK based. Thanks.