Malbaby Posted September 28, 2014 Report Share Posted September 28, 2014 I am currently fitting a 2500 overdrive gearbox to my TR4A. Having to fabricate a new gearbox mount. Require a measurement....see pics. Either the centre of the gearbox output flange above a line drawn across the top of the chassis rails [ 75-85mm perhaps], or if someone has fitted an O/D box, the top of the gearbox mount bracket in relation to the solenoid [centre of solenoid perhaps]. Quote Link to post Share on other sites
Lebro Posted September 28, 2014 Report Share Posted September 28, 2014 I think you can buy adaptor mountings from Moss etc. Bob. Quote Link to post Share on other sites
Malbaby Posted September 28, 2014 Author Report Share Posted September 28, 2014 Thanks Bob, I prefer to make my own. Can anyone assist with the measurement? Quote Link to post Share on other sites
littlejim Posted September 28, 2014 Report Share Posted September 28, 2014 Thanks Bob, I prefer to make my own. Can anyone assist with the measurement? If we are talking about #82 in the Moss cattledog, the metal bonded to rubber bit will be hard to reproduce at home yourself. Quote Link to post Share on other sites
Malbaby Posted September 29, 2014 Author Report Share Posted September 29, 2014 Sorry guys, should have said that I am using the factory 2500 gearbox mount. Just need the measurement to determine the height of the output shaft so that I can make brackets to bolt onto the 2500 mount. Quote Link to post Share on other sites
ronhatch Posted September 30, 2014 Report Share Posted September 30, 2014 Hi Malcolm, I will be doing this but not for a while yet, If I figure it out I will post. Regards Ron Quote Link to post Share on other sites
Malbaby Posted October 1, 2014 Author Report Share Posted October 1, 2014 (edited) Does anyone have the time to do the measurement or a similar one for me? Edited October 1, 2014 by Malcolm Linda Baker Quote Link to post Share on other sites
AlanT Posted October 2, 2014 Report Share Posted October 2, 2014 Try posting on British Car Forum. Not many in the UK have this set-up and making this measurement would mean taking out the tunnel, Quote Link to post Share on other sites
BlueTR3A-5EKT Posted October 2, 2014 Report Share Posted October 2, 2014 Beware the exhaust pipe - if you are staying with the standard arrangement. Did this on a TR2 using a modified Dolomite Sprint assy and to get the flange as orig the exhaust clouted the o/d and the solenoid rubbed the chassis rail. Went back to 'A' type overdrive in the end. Cheers Peter W Quote Link to post Share on other sites
Malbaby Posted October 3, 2014 Author Report Share Posted October 3, 2014 Even a measuremet from under the car would suffice. I have enough space for the exhaust .... have to make a new exhaust system anyway, which will be modified for any clearance issues...... and as noted above by Peter, I will ensure clearance for the solenoid by trimming the original gearbox bracket that is attached to the chassis. Quote Link to post Share on other sites
Kiwifrog Posted October 3, 2014 Report Share Posted October 3, 2014 (edited) Beware the exhaust pipe - if you are staying with the standard arrangement. Did this on a TR2 using a modified Dolomite Sprint assy and to get the flange as orig the exhaust clouted the o/d and the solenoid rubbed the chassis rail. Went back to 'A' type overdrive in the end. Cheers Peter W Pete I also made up my own bracket on a 3a and had a hell of a job getting the standard exhaust past, gave up and bought one of CTM's adaptor brackets from Colin for around £100. Excelent fit very well made and no more exhaust problems. TR3A with Dolly sprint J type box and overdrive cheers Alan Edited October 3, 2014 by Kiwifrog Quote Link to post Share on other sites
graeme Posted October 4, 2014 Report Share Posted October 4, 2014 I have it noted as 70mm from chassis to centre line of the shaft. I have fitted a 2.5 saloon J type g/box in my TR4A. Cut out required for clearance of solenoid. Bracket made up for exhaust. Cheers Graeme Quote Link to post Share on other sites
AlanT Posted October 4, 2014 Report Share Posted October 4, 2014 Graeme, what material did you use for the bracket? I believe this will fracture. Quote Link to post Share on other sites
graeme Posted October 4, 2014 Report Share Posted October 4, 2014 Graeme, what material did you use for the bracket? I believe this will fracture. Alan, The material is 16g mild steel, why do you think it might fracture? Graeme Quote Link to post Share on other sites
Geko Posted October 4, 2014 Report Share Posted October 4, 2014 (edited) Alan, The material is 16g mild steel, why do you think it might fracture? Graeme Agreed - the angled part will fracture (one day) because of the vibes of the shaft and the swaying exhaust line. Best is to weld a triangular strengthening plate on the left side of the bracket or a design approaching that curve of the original bracket Edited October 4, 2014 by Geko Quote Link to post Share on other sites
peejay4A Posted October 4, 2014 Report Share Posted October 4, 2014 Or just don't use the bracket at all as I did on my 6 and also on the 4A. It eliminates those SS exhaust resonances coming through the gearbox. Quote Link to post Share on other sites
AlanT Posted October 4, 2014 Report Share Posted October 4, 2014 The bend at the top will have micro-cracks unless you selected a grade of material to stand a bend like this, or maybe bent it hot. You probably banged it over in a vise and the inner corner is even sharper? A welded re-inforcement that stops bending at this point will probably solve it. It won't break right away. It might take years. It might go quite quickly. There are a lot of variables. Quote Link to post Share on other sites
graeme Posted October 5, 2014 Report Share Posted October 5, 2014 Thanks Alan. Graeme Quote Link to post Share on other sites
Malbaby Posted October 6, 2014 Author Report Share Posted October 6, 2014 (edited) Thanks for the measurement Graeme. Was it still 70mm after the restoration using new parts. What gearbox mount did you use....my 2500 mount is different to what you have used ? Edited October 6, 2014 by Malcolm Linda Baker Quote Link to post Share on other sites
graeme Posted October 6, 2014 Report Share Posted October 6, 2014 The gearbox mount is from a GT6 and I aimed to get 70mm after the new crossmember was built. Graeme Quote Link to post Share on other sites
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