TimW Posted July 6, 2021 Share Posted July 6, 2021 So I have a type 9 gearbox in my GT6. The ratios are no longer suitable with the power and torque I'm now producing so I'd like to sell the gearbox as a kit. Question is what to replace it with? I'd like to keep my GT6 flywheel if at all possible as it's balanced as part of the rotating assembly. What are your thoughts? Quote Link to comment Share on other sites More sharing options...
thescrapman Posted July 7, 2021 Share Posted July 7, 2021 Are you looking for overall higher gearing, so more like a closer ratio spread in a GT6 box (not suggesting you revert!) with the higher first gear? Perhaps start with what is wrong with the current ratios? Quote Link to comment Share on other sites More sharing options...
mpbarrett Posted July 7, 2021 Share Posted July 7, 2021 pop over to Sideways as Nick Jones has produced a spreadsheet with all the ratios for lots of different gearboxes, I think the thread is Close Ratio or similar. mike Quote Link to comment Share on other sites More sharing options...
TimW Posted July 7, 2021 Author Share Posted July 7, 2021 2 hours ago, thescrapman said: Are you looking for overall higher gearing, so more like a closer ratio spread in a GT6 box (not suggesting you revert!) with the higher first gear? Perhaps start with what is wrong with the current ratios? So 1st is far too short, 2nd isn't bad but too tall for standing starts and too short to 3rd which is about the same as a GT6 box. 4th and 5th are OK but 5th isn't quite as long as overdrive 4th in a d-type gt6 box so that means I need to use a 3.27 diff to get the legs for motorway use. Obviously a GT6 box isn't really going to be strong enough to cope with the torque I have (about 210ftlb) saloon/TR6 box requires chassis mods that in an ideal world I'd like to avoid if possible and if I used such a box I'm assuming I wouldn't be able to use a GT6 flywheel? Quote Link to comment Share on other sites More sharing options...
thescrapman Posted July 7, 2021 Share Posted July 7, 2021 You can use a GT6 Flywheel with a TR box. Sprint box may be better bet, check the ratios. J-type saloon box has same input shaft size as GT6 Need to use Sprint clutch release the I thunk no or less chassis mods needed. Quote Link to comment Share on other sites More sharing options...
TimW Posted July 7, 2021 Author Share Posted July 7, 2021 16 minutes ago, thescrapman said: You can use a GT6 Flywheel with a TR box. Sprint box may be better bet, check the ratios. J-type saloon box has same input shaft size as GT6 Need to use Sprint clutch release the I thunk no or less chassis mods needed. Thanks 👍 Quote Link to comment Share on other sites More sharing options...
Gt6s Posted July 7, 2021 Share Posted July 7, 2021 (edited) Saloon box still low 1st even with Sprint / TR gears. But can have 28 % overdrive. Saloon box is a do it once mod YOU WILL NOT BREAK ONE IN A GT6 Edited July 7, 2021 by Gt6s Quote Link to comment Share on other sites More sharing options...
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