DanTR6 Posted January 20, 2020 Report Share Posted January 20, 2020 Does anyone know where I might find a 4.875:1 TR6 crown wheel and pinion which was Triumph Special tuning number 515709 4.55 is the lowest I can find from the usual parts suppliers Thanks Quote Link to post Share on other sites
Dave McDonald Posted January 21, 2020 Report Share Posted January 21, 2020 Dan, At a guess that could be from something like a Standard Atlas van. You could try Revington TR, I think they had one replicating a period Works Rally/Race support vehicle. They MIGHT have a spare. Worth a call. Alternatively, try Canley Classics who have also restored one in Works livery. See link https://www.canleyclassics.com/our-museum/atlas-van/ Good luck with your search, though for the life in me I can't imagine why you would want it in a TR6? Dave McD Quote Link to post Share on other sites
Hamish Posted January 21, 2020 Report Share Posted January 21, 2020 One here https://www.revingtontr.com/product/515709/name/crown-wheel-pinion-48751-tr6 and a 6.67 https://www.revingtontr.com/product/rtr1278/name/cwp-6671-tr2-6 Listed but not always available. Quote Link to post Share on other sites
iain Posted January 21, 2020 Report Share Posted January 21, 2020 Wow, that’s low, very low. Quote Link to post Share on other sites
Hamish Posted January 21, 2020 Report Share Posted January 21, 2020 Put it in mintylamb http://www.mintylamb.co.uk/gearspeed/ its 57mph flat out in 4th !!!!! Quote Link to post Share on other sites
Waldi Posted January 22, 2020 Report Share Posted January 22, 2020 Thanks for sharing the link Hamish, what a nice tool! The person who built it deserves credit, especially for sharing it with others. Waldi Quote Link to post Share on other sites
DanTR6 Posted January 23, 2020 Author Report Share Posted January 23, 2020 On 1/21/2020 at 7:57 PM, Dave McDonald said: Dan, At a guess that could be from something like a Standard Atlas van. You could try Revington TR, I think they had one replicating a period Works Rally/Race support vehicle. They MIGHT have a spare. Worth a call. Alternatively, try Canley Classics who have also restored one in Works livery. See link https://www.canleyclassics.com/our-museum/atlas-van/ Good luck with your search, though for the life in me I can't imagine why you would want it in a TR6? Dave McD Thanks Dave, I will try Canleys to see if they have anything. It seems 4.875 upwards was as you say a standard atlas van The TR no longer has its original engine and has something that revs a lot higher, hence the lower gear ratio Quote Link to post Share on other sites
DanTR6 Posted January 23, 2020 Author Report Share Posted January 23, 2020 On 1/21/2020 at 8:16 PM, Hamish said: One here https://www.revingtontr.com/product/515709/name/crown-wheel-pinion-48751-tr6 and a 6.67 https://www.revingtontr.com/product/rtr1278/name/cwp-6671-tr2-6 Listed but not always available. Thanks Hamish, Revington was the first place tried, they have the 6.67 or 4.55 all the others have gone unfortunately. Quote Link to post Share on other sites
DanTR6 Posted January 23, 2020 Author Report Share Posted January 23, 2020 On 1/21/2020 at 9:56 PM, Hamish said: Put it in mintylamb http://www.mintylamb.co.uk/gearspeed/ its 57mph flat out in 4th !!!!! I want it low but not that low :-) I think they told me that one was from a military vehicle Quote Link to post Share on other sites
Andy Moltu Posted January 23, 2020 Report Share Posted January 23, 2020 Out of interest why do you want such a ratio? You mention a different engine. Quote Link to post Share on other sites
DanTR6 Posted February 25, 2020 Author Report Share Posted February 25, 2020 So the diff is back from being rebuilt, they had some issues with the rear cover not fitting due to the larger crown wheel and having to put a different TR6 cover on. The original is a the V3229 casting which is often listed as the TR6/TR250 diff casing. The new one has a V3135 Stanpart casting number on it and 308393 on the other side. As you can see from the picture, the new cover doesn't have the cast feature which helps keep oil against the crown wheel and narrows the case in this area. Any idea what the new larger case is from? all the mounting pints look to be the same and its a single piece case Quote Link to post Share on other sites
Chilliman Posted February 25, 2020 Report Share Posted February 25, 2020 Quote larger crown wheel So the new CW&P were different physical dimensions as well as different gear ratio's? That must have been a challenge to fit? How much different were they? Quote Link to post Share on other sites
DanTR6 Posted February 25, 2020 Author Report Share Posted February 25, 2020 (edited) 34 minutes ago, Chilliman said: So the new CW&P were different physical dimensions as well as different gear ratio's? That must have been a challenge to fit? How much different were they? I believe its thicker to compensate for the different pinion height on the lower ratio so it must move the edge of the crown wheel across I didn't fit it, I got a transmission specialist to do it as its a different tooth pattern and a bit fiddly to set up from what I have heard. Edited February 25, 2020 by DanTR6 Quote Link to post Share on other sites
Bill944T Posted February 25, 2020 Report Share Posted February 25, 2020 The TR no longer has its original engine and has something that revs a lot higher, hence the lower gear ratio Go on, stop teasing us, tell us what you're putting in there! Regards Bill Quote Link to post Share on other sites
DanTR6 Posted February 25, 2020 Author Report Share Posted February 25, 2020 5 minutes ago, Bill944T said: The TR no longer has its original engine and has something that revs a lot higher, hence the lower gear ratio Go on, stop teasing us, tell us what you're putting in there! Regards Bill ......a couple of pictures to explain ones real and ones 3D printed in plastic for mock up purposes 240Nm of torque at zero RPM and a 8KRPM Rev limit - hence the low diff ratio as it won’t have a gearbox, just the overdrive. Quote Link to post Share on other sites
Mike C Posted February 26, 2020 Report Share Posted February 26, 2020 8K RPM into the overdrive will be interesting. Quote Link to post Share on other sites
DanTR6 Posted February 26, 2020 Author Report Share Posted February 26, 2020 7 hours ago, Mike C said: 8K RPM into the overdrive will be interesting. in reality it probably wont pull full RPM as the torque drops off at about 6K, so probably no different to any of the racers out there giving these things a hard time. Quote Link to post Share on other sites
DanTR6 Posted February 26, 2020 Author Report Share Posted February 26, 2020 On 2/25/2020 at 7:46 AM, DanTR6 said: So the diff is back from being rebuilt, they had some issues with the rear cover not fitting due to the larger crown wheel and having to put a different TR6 cover on. The original is a the V3229 casting which is often listed as the TR6/TR250 diff casing. The new one has a V3135 Stanpart casting number on it and 308393 on the other side. As you can see from the picture, the new cover doesn't have the cast feature which helps keep oil against the crown wheel and narrows the case in this area. Any idea what the new larger case is from? all the mounting pints look to be the same and its a single piece case does anyone know what the different case is? Quote Link to post Share on other sites
stuart Posted February 26, 2020 Report Share Posted February 26, 2020 10 minutes ago, DanTR6 said: does anyone know what the different case is? Thats a standard TR6 one. Stuart. Quote Link to post Share on other sites
DanTR6 Posted February 26, 2020 Author Report Share Posted February 26, 2020 7 hours ago, stuart said: Thats a standard TR6 one. Stuart. thanks Stuart, so is the other case a later TR6 case as well? I can only see one part number listed for a TR6 case Quote Link to post Share on other sites
stuart Posted February 27, 2020 Report Share Posted February 27, 2020 Dont think it is, it might be from a dolomite or a saloon. Stuart. Quote Link to post Share on other sites
Hamish Posted February 27, 2020 Report Share Posted February 27, 2020 I have one similar on my TR3a. the attachment eyes were damaged while on original car thus cut off. It’s has a larger oil capacity for my LSD. i think I was told it’s off a 2500 estate not quite the same as above picture as that has more “wing” bracing. Quote Link to post Share on other sites
BlueTR3A-5EKT Posted February 27, 2020 Report Share Posted February 27, 2020 41 minutes ago, Hamish said: I have one similar on my TR3a. the attachment eyes were damaged while on original car thus cut off. It’s has a larger oil capacity for my LSD. i think I was told it’s off a 2500 estate not quite the same as above picture as that has more “wing” bracing. That is a saloon 2000/2.5 cover with the ears cut off. Estate is the same as Stag and has 4 studs coming out the back that a big steel support plate bolts to. Sensible mod on LSD. Looks like the handbrake cable rubs against it. Cheers Peter W Quote Link to post Share on other sites
Hamish Posted February 27, 2020 Report Share Posted February 27, 2020 (edited) 23 minutes ago, BlueTR3A-5EKT said: That is a saloon 2000/2.5 cover with the ears cut off. Estate is the same as Stag and has 4 studs coming out the back that a big steel support plate bolts to. Sensible mod on LSD. Looks like the handbrake cable rubs against it. Cheers Peter W Thanks Peter that makes sense and yes the handbrake cable is close. I intend to sleeve it /clip it so it doesn’t chafe. H Edited February 27, 2020 by Hamish Quote Link to post Share on other sites
Dave McDonald Posted March 2, 2020 Report Share Posted March 2, 2020 On 2/25/2020 at 7:46 AM, DanTR6 said: So the diff is back from being rebuilt, they had some issues with the rear cover not fitting due to the larger crown wheel and having to put a different TR6 cover on. The original is a the V3229 casting which is often listed as the TR6/TR250 diff casing. The new one has a V3135 Stanpart casting number on it and 308393 on the other side. As you can see from the picture, the new cover doesn't have the cast feature which helps keep oil against the crown wheel and narrows the case in this area. Any idea what the new larger case is from? all the mounting pints look to be the same and its a single piece case Dan, I have a cover like the one on the right on my race TR6 with a 4.1 cwp with LSD. The cover required a minor amount of grinding internally to clear the crown wheel. The other photo that I've attached is another different cover that I have, again for the race TR6, with a 3.9 cwp with LSD. Don't know what that's off either. Dave McD Quote Link to post Share on other sites
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