Hamish Posted April 14 Report Share Posted April 14 Here you go. An A type full throttle 4th to OD 4th at about 1.35 into this video great fun. Quote Link to post Share on other sites
MJK Posted April 14 Author Report Share Posted April 14 Peter, Stuart & Hamish, Some great feedback, thanks very much. As regards the clutch, I won't bother. @Hamish - Aintree looks like fun. @Stuart - I need to be careful when listening to Healey drivers!!! Thanks again, Malcolm Quote Link to post Share on other sites
Phil Read Posted April 15 Report Share Posted April 15 On 9/9/2023 at 7:43 AM, rcreweread said: I'm surprised that ORS advised that OD would only be found on 3rd and 4th, which I assume meant they thought it was a J type box/OD which clearly TR5/250 models never had, the J type coming in on the later TR6s ( CR series I think was the changeover). Another alternative to consider is Pete Cox ( https://petecoxsportscars.co.uk/ ) Cheers Rich My 250 which was one of the last made has a j type over drive. overdrive on 3&4 dont know if this was a later replacement but its very smooth. Quote Link to post Share on other sites
stuart Posted April 15 Report Share Posted April 15 2 hours ago, Phil Read said: My 250 which was one of the last made has a j type over drive. overdrive on 3&4 dont know if this was a later replacement but its very smooth. Definitely a later replacement box. "A" types continued through TR6 production until introduction of the CR model late 72. Stuart. Quote Link to post Share on other sites
Andy Moltu Posted April 15 Report Share Posted April 15 If you haven’t got an overdrive box you can fit a J type or an A type to your car. However your car would originally had an A type. If you fit a J type you need to be aware the chassis mounts which take the weight of the rear of the box are different for the two. Not a problem as such but you would need an adaptor if you fit a J type to your car. Does it matter whether you have overdrive on 2nd & 3rd & 4th or just on 3rd & 4th is about how you choose to use it. The appeal of a 7 speed transmission is countered by the spacing of the gears. If you have a close ratio box it allows 7 gears. However the torque band of the 6 pot might render this superfluous. O/d 3rd useful in traffic If otherwise in and out of 4th and o/d in top is good for motorway cruising. Triumph/Laycock dropped o/d 2nd to limit the torque through the J type. Some assume this is a suggestion that the J is weaker but is almost bombproof in reality. Quote Link to post Share on other sites
Kenrow Posted April 17 Report Share Posted April 17 For those wanting to put a J Type OD in: Adapting J Type OD to Early TR6 Frames Quote Link to post Share on other sites
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