Clive T Posted March 27, 2009 Report Share Posted March 27, 2009 Hi, I have just bought a triumph 2000 saloon A type overdrive gearbox and want to fit it to my 1970 TR6, what do I have to change to get it to fit ? Would it just be the clutch pressure plate, or is there anything else? I would like some help please. Regards, Clive T. Quote Link to post Share on other sites
Rhodri Posted March 27, 2009 Report Share Posted March 27, 2009 The clutch driven plate, speedo recalibrated due to different wheel sizes (or new expensive anulus ). I also changed the rear housing on mine to get the solenoid vertical, otherwise I believe you have to cut a smijin out of the floor to accomodate the horizontal solenoid. The saloon box also needs new adapter brackets to the chassis, unless you do the aforementioned rear housing change. I had the box and OD to pieces so it was easier to change this housing. Obviously additional wiring, and switches, will be needed. My work was done on a TR4 , but I believe that the 6 will be the same. Rod Quote Link to post Share on other sites
Mike C Posted March 28, 2009 Report Share Posted March 28, 2009 Clive, For what it's worth I have a Triumph 2500 (MK series) gearbox with a type A overdrive fitted.It take the power of a fast road engine with no problems other than a fairly short clutch life ,which may not be due the 2500 clutch assemblies fitted. In addition to Rod's list you might also want to look at changing your O/D accumulator springs to a TR set. Regards, Quote Link to post Share on other sites
Clive T Posted March 28, 2009 Author Report Share Posted March 28, 2009 The clutch driven plate, speedo recalibrated due to different wheel sizes (or new expensive anulus ). I also changed the rear housing on mine to get the solenoid vertical, otherwise I believe you have to cut a smijin out of the floor to accomodate the horizontal solenoid. The saloon box also needs new adapter brackets to the chassis, unless you do the aforementioned rear housing change. I had the box and OD to pieces so it was easier to change this housing. Obviously additional wiring, and switches, will be needed. My work was done on a TR4 , but I believe that the 6 will be the same. Rod Hi Rod, So am I correct in understanding you, I Just need to fit a 2000 Clutch plate because of the shaft size, but can use a TR6 cover plate, and just a small modification to the floor and thats it ? Regards, Clive. Quote Link to post Share on other sites
Clive T Posted March 28, 2009 Author Report Share Posted March 28, 2009 Hi Rod, So am I correct in understanding you, I Just need to fit a 2000 Clutch plate because of the shaft size, but can use a TR6 cover plate, and just a small modification to the floor and thats it ? Regards, Clive. Quote Link to post Share on other sites
Rhodri Posted March 28, 2009 Report Share Posted March 28, 2009 http://www.tr-register.co.uk/forums/index.php?showtopic=9739 That is about all that I can remember from two years ago. I know that there is an article on the net with photos that describes exactly what you want to do. However I can't find it with a quick search. Rod Quote Link to post Share on other sites
Mike C Posted March 28, 2009 Report Share Posted March 28, 2009 Hi Rod, Do you know if the Moss uprated GT6 clutch plate discussed in the thread is a significant improvement over a NOS 2500 unit. Regards Quote Link to post Share on other sites
bill holden Posted March 28, 2009 Report Share Posted March 28, 2009 Hi I did this a few years ago to a US spec TR6. From memory i changed the springs for the pressure system, the clutch plate, the output flange(using the one off the old box) and also the solenoid. I seem to recall that I also had to modify the rear support bracket. The speedometer drive as one other correspondent said requires eithr a planet shell change (V expensive ) or the speedometer head can be changed , there are specialists who will do this. Another problem is the operating switch, if you have a standard TR6 o/d switch then the TR6 gearlever is fine. If you wish to use the 2000 leverwith the switch on the knob, then you can end up with banged knuckles from the dash. The lever can be bent and shortened if you know a good welder (notMIG) Bill Holden Quote Link to post Share on other sites
Clive T Posted March 28, 2009 Author Report Share Posted March 28, 2009 Hi I did this a few years ago to a US spec TR6. From memory i changed the springs for the pressure system, the clutch plate, the output flange(using the one off the old box) and also the solenoid. I seem to recall that I also had to modify the rear support bracket. The speedometer drive as one other correspondent said requires eithr a planet shell change (V expensive ) or the speedometer head can be changed , there are specialists who will do this. Another problem is the operating switch, if you have a standard TR6 o/d switch then the TR6 gearlever is fine. If you wish to use the 2000 leverwith the switch on the knob, then you can end up with banged knuckles from the dash. The lever can be bent and shortened if you know a good welder (notMIG) Bill Holden Hi Bill, Thanks for the information,when you say you change the output flange was this because all the holes don`t line up ? Regards, Clive Quote Link to post Share on other sites
Rhodri Posted March 28, 2009 Report Share Posted March 28, 2009 Mike, I have no idea regarding the two plates. Bill- welcome to THE forum! Rod Quote Link to post Share on other sites
Mike C Posted March 28, 2009 Report Share Posted March 28, 2009 Thanks Rod, I would welcome any recommendations anyone has on the best clutch plate for a 2500 gearbox in a TR6. With regard to the O/D switch I use a TR6 switch mounted on the left of the steering wheel,it's very easy to operate although I use the overdrive mainly for cruising ,not split shifting through the gears. Regards, Quote Link to post Share on other sites
TR6 Poor Posted March 29, 2009 Report Share Posted March 29, 2009 I think I was told in the past, you can change the Trans input shaft to one from a TR6, and use the standard TR6 clutch. Is this not true? Quote Link to post Share on other sites
Mike C Posted March 29, 2009 Report Share Posted March 29, 2009 Thanks.I did a bit of research over the weekend and Daikin(Exedy) make a heavy duty clutch kit for a Triumph 2500.Part No. is TRK-6116HD. I'll look at those for the next clutch.Also I believe Isuzu make a 9.0 inch clutch that's interchangeable and more robust. I don't know if a 2500 clutch is weaker than a TR6 clutch ,mine last (2500-MK gearbox) one had only done a few,maybe two, thousand miles and it just started slipping on a freeway in overdrive top.And that was the end of it. Regards, Quote Link to post Share on other sites
tr6driver Posted March 29, 2009 Report Share Posted March 29, 2009 Hi. I have changed to a 2500 saloon J-type OD gearbox on my TR6. I had to change to a different clutch plate,from a 2000/2500 saloon car. It is also another issue , that is the ratio of the differential. I would recomend that you go for a 3,7:1 or a 4,1:1 diff ratio,otherwise your TR6 will perform slower in acceleration than before,that was my experience. Oystein Quote Link to post Share on other sites
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