TimW Posted July 31, 2021 Share Posted July 31, 2021 Anyone know what mods I need to do, other than chassis, to get a saloon box to work in a GT6? Quote Link to comment Share on other sites More sharing options...
thescrapman Posted July 31, 2021 Share Posted July 31, 2021 Hopefully it is the J type you were enquiring about on Facebook, A type much harder. May be not possible. I think the chassis mods are more if you move engine back. Quote Link to comment Share on other sites More sharing options...
glang Posted July 31, 2021 Share Posted July 31, 2021 Do look at the ratios, especially first, of any substitute box you might want to install.... Quote Link to comment Share on other sites More sharing options...
Clive Posted August 1, 2021 Share Posted August 1, 2021 Bearing carrier needs to be longer. Use sprint cross shaft and slave cylinder mount. You need somewhere to mount the rear of the box I welded a bit of 2mm plate between the chassis rails. I think the speedo cable was tricky, I can't remember why (it was 25 years ago!) But probably clearance to chassis Flywheel needs boring to accept the saloon/tr spigot bush. Possibly other stuff? Engine backplate? Gearstick came out in the std position. I shortened the stick All in my 2.5 vitesse. Quote Link to comment Share on other sites More sharing options...
TimW Posted August 1, 2021 Author Share Posted August 1, 2021 8 hours ago, glang said: Do look at the ratios, especially first, of any substitute box you might want to install.... I have already done so. First is significantly shorter than a standard GT6 box but it's also considerably longer than the type9 I currently have. Quote Link to comment Share on other sites More sharing options...
glang Posted August 1, 2021 Share Posted August 1, 2021 A 3.27 diff will help a lot if you havent already got one... Quote Link to comment Share on other sites More sharing options...
TimW Posted August 2, 2021 Author Share Posted August 2, 2021 19 hours ago, glang said: A 3.27 diff will help a lot if you havent already got one... Already have a 3.27 LSD fitted. Quote Link to comment Share on other sites More sharing options...
Clive Posted August 2, 2021 Share Posted August 2, 2021 Thinking about this, dolly sprint ratios are better. If you could find a cheap sprint box, and use first gear from that? Quote Link to comment Share on other sites More sharing options...
glang Posted August 2, 2021 Share Posted August 2, 2021 According to the richyrichracing calculator a late TR6 gearbox has the lowest 1st ratio of all the big boxes. Not sure what serial number that would be though... Quote Link to comment Share on other sites More sharing options...
DVD3500 Posted August 2, 2021 Share Posted August 2, 2021 I am looking for a 3.27 Diff if someone has one.. I can trade a 3.89 an a 3.63... Thanks Quote Link to comment Share on other sites More sharing options...
thescrapman Posted August 2, 2021 Share Posted August 2, 2021 6 hours ago, glang said: According to the richyrichracing calculator a late TR6 gearbox has the lowest 1st ratio of all the big boxes. Not sure what serial number that would be though... Anything TR will have the fat input shaft, which is great for a heavy clutch. yiu can swap it for a saloon one if you don't have a very muscular left leg. If you find a Sprint input shaft you will still need a saloon input shaft as well. Quote Link to comment Share on other sites More sharing options...
TimW Posted August 2, 2021 Author Share Posted August 2, 2021 Genuinely guys I'm not concerned about the short first gear. It's not as short as the type 9 and I have a 3.27 fitted so 1st will be an improvement on my current setup. There's no such thing as a cheap triumph gearbox of any description these days!! Quote Link to comment Share on other sites More sharing options...
thescrapman Posted August 2, 2021 Share Posted August 2, 2021 (edited) I can do about 35 in first in my TR6, but it does scream a bit, that has a Sprint box in it. 3.45 diff I think Not that low... 🙂 Edited August 2, 2021 by thescrapman Quote Link to comment Share on other sites More sharing options...
TimW Posted August 2, 2021 Author Share Posted August 2, 2021 I agree and as I have the 3.27 diff I think itll be ok. Any idea how fast you can get out of it in 2nd? I've checked the saloon ratios 2nd is quite a bit shorter than 2nd in the type 9 box. The type 9 is 1.81:1 but the saloon is 2.10:1.. not a huge difference granted but I do find 2nd a bit short with the type 9 Can I swap and change ratios using a Sprint gearset? I have a lead on a couple of sprint boxes going cheap so thought it may be worth a try as folk fit sprint ratios into GT6 cases and as the sprint box is very similar to a saloon case I was wondering if it was possible? Quote Link to comment Share on other sites More sharing options...
TimW Posted August 2, 2021 Author Share Posted August 2, 2021 (edited) My brother had a modified GT6 that had a TR6 28% j-type and that apparently had a sprint gearset? Edited August 2, 2021 by TimW Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted August 2, 2021 Share Posted August 2, 2021 I think the late ('74 on) TR6 had the same ratios as the Sprint. Not sure if saloon also. Nick Quote Link to comment Share on other sites More sharing options...
Clive Posted August 3, 2021 Share Posted August 3, 2021 12 hours ago, TimW said: I agree and as I have the 3.27 diff I think itll be ok. Any idea how fast you can get out of it in 2nd? I've checked the saloon ratios 2nd is quite a bit shorter than 2nd in the type 9 box. The type 9 is 1.81:1 but the saloon is 2.10:1.. not a huge difference granted but I do find 2nd a bit short with the type 9 Can I swap and change ratios using a Sprint gearset? I have a lead on a couple of sprint boxes going cheap so thought it may be worth a try as folk fit sprint ratios into GT6 cases and as the sprint box is very similar to a saloon case I was wondering if it was possible? Sprint, as in dolomite sprint, gears are totally different to gt6, and won't fit into a gt6 case. Maybe there are gears etc about with "sprint", ie racing, ratios. Probably from sah etc. Yes, dolly sprint gears can be used in a saloon box. But watch out, I think tooth angles changed at some point. Possibly when they changed from a to j type? But do check that. In my vitesse I broke several 3.27 diffs, usually pulling away "promptly" in first. It put a massive strain in the diff, a longer first would have been a great help. Quote Link to comment Share on other sites More sharing options...
TimW Posted August 3, 2021 Author Share Posted August 3, 2021 12 minutes ago, Clive said: Sprint, as in dolomite sprint, gears are totally different to gt6, and won't fit into a gt6 case. Maybe there are gears etc about with "sprint", ie racing, ratios. Probably from sah etc. Yes, dolly sprint gears can be used in a saloon box. But watch out, I think tooth angles changed at some point. Possibly when they changed from a to j type? But do check that. In my vitesse I broke several 3.27 diffs, usually pulling away "promptly" in first. It put a massive strain in the diff, a longer first would have been a great help. Thanks Clive I'd have thought that a shorter first would put less torque through the diff as it would be easier to spin the wheels so not being as hard on the diff?? I've only broken one 3.27 and that were the roll pins in the carrier that broke. I don't have that issue now with the LSD. Think I've made the decision to fit the saloon box as is. I've now sourced a dolly sprint cross shaft and slave cylinder bracket. The only thing I need info on now is what clutch release bearing carrier to use with the gt6 flywheel and pressure plate?? Quote Link to comment Share on other sites More sharing options...
Clive Posted August 3, 2021 Share Posted August 3, 2021 47 minutes ago, TimW said: Thanks Clive I'd have thought that a shorter first would put less torque through the diff as it would be easier to spin the wheels so not being as hard on the diff?? I've only broken one 3.27 and that were the roll pins in the carrier that broke. I don't have that issue now with the LSD. Think I've made the decision to fit the saloon box as is. I've now sourced a dolly sprint cross shaft and slave cylinder bracket. The only thing I need info on now is what clutch release bearing carrier to use with the gt6 flywheel and pressure plate?? I think it may be off a dolly, possibly 1850? Mine used the std saloon carrier, made the clutch very heavy, plus I had to modify the cross shaft. Mike Papworth will know. It is down to the saloon flywheel being much thicker. Messes the geometry up. Quote Link to comment Share on other sites More sharing options...
TimW Posted August 3, 2021 Author Share Posted August 3, 2021 50 minutes ago, Clive said: I think it may be off a dolly, possibly 1850? Mine used the std saloon carrier, made the clutch very heavy, plus I had to modify the cross shaft. Mike Papworth will know. It is down to the saloon flywheel being much thicker. Messes the geometry up. Thanks Clive A call to Mike Papworth or Tony Lindley-dean is in order I think. I really need to keep my balanced GT6 flywheel Quote Link to comment Share on other sites More sharing options...
thescrapman Posted August 3, 2021 Share Posted August 3, 2021 I was going to say, don't use a saloon flywheel! But you beat me to it. 🙂 it is approaching 60 in second, then add OD on second (easily done on a later saloon box) and you are up round 70. Quote Link to comment Share on other sites More sharing options...
TimW Posted August 3, 2021 Author Share Posted August 3, 2021 6 minutes ago, thescrapman said: I was going to say, don't use a saloon flywheel! But you beat me to it. 🙂 it is approaching 60 in second, then add OD on second (easily done on a later saloon box) and you are up round 70. Great stuff. Do I need to change the backplate from a GT6 one to a saloon or TR6 one? Quote Link to comment Share on other sites More sharing options...
thescrapman Posted August 4, 2021 Share Posted August 4, 2021 Good question. not a saloon one as it will tilt the gearbox. TR one I find the GT6 one isn't right. Hopefully someone will pop up with right answer Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted August 5, 2021 Share Posted August 5, 2021 The saloon box does not fit a GT6 backplate. And it’s more than just a couple of holes out. The saloon engine backplate and TR250 / 5 & 6 are all the same part. The angle is a red herring. Nick 1 Quote Link to comment Share on other sites More sharing options...
Gt6s Posted January 23, 2022 Share Posted January 23, 2022 On 05/08/2021 at 11:03, Nick Jones said: The saloon box does not fit a GT6 backplate. And it’s more than just a couple of holes out. The saloon engine backplate and TR250 / 5 & 6 are all the same part. The angle is a red herring. Nick The saloon TR box sits vertical in a Gt6 Vitesse. Angled to right in a big T Quote Link to comment Share on other sites More sharing options...
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