TimW Posted August 18, 2021 Share Posted August 18, 2021 I've read that the TR6 has 8 clutch springs in the overdrive but the 2.0L saloon only had 4 springs. The 2.5pi had 8 springs. I've got a j-type saloon box to put in the GT6. Is there any way of telling if I have a 4 or 8 spring J-type overdrive without pulling it apart? Quote Link to comment Share on other sites More sharing options...
yorkshire_spam Posted August 18, 2021 Share Posted August 18, 2021 Sorry Tim, I don't know. I suppose it MIGHT be theoretically possible to tell if there's a difference in the serial numbers from one vehicle to the other? (Like you can with the various versions of the BW65 autobox?) Maybe worth a call to http://www.odspares.com/ ? 1 Quote Link to comment Share on other sites More sharing options...
Velocita Rosso Posted August 18, 2021 Share Posted August 18, 2021 Or..https://www.overdrive-repairs.co.uk/. Just down the road and they built one for Philip ...to his spec...good guys and very helpful Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted August 18, 2021 Share Posted August 18, 2021 I though that spring thing applied to A-type rather than J-type? Could be both…. Nick Quote Link to comment Share on other sites More sharing options...
TimW Posted August 19, 2021 Author Share Posted August 19, 2021 9 hours ago, Nick Jones said: I though that spring thing applied to A-type rather than J-type? Could be both…. Nick It was Just based on some research I've been doing on the TR forums Nick. If it only applies to A-type then I need not worry I guess Quote Link to comment Share on other sites More sharing options...
thescrapman Posted August 19, 2021 Share Posted August 19, 2021 J-Type increases hydraulic pressure for greater engagement force I think. Sprint runs the highest pressure ISTR 1 Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted August 19, 2021 Share Posted August 19, 2021 They all have variations in hydraulic pressure according to application. The idea being to have enough clamp to comfortably hold the torque but with minimum parasitic losses. This applies to OD engaged only. The springs apply in the disengaged state. For sure there are differences in the A-type springs according to application; I came across that when rebuilding my PI box. I’m failing to find references for other types, but that’s hardly a reliable guide….. Nick Quote Link to comment Share on other sites More sharing options...
TimW Posted August 19, 2021 Author Share Posted August 19, 2021 Ok Thanks Nick My information came from a TR forum so hardly a reliable source. Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted August 19, 2021 Share Posted August 19, 2021 You could try reading through these extremely comprehensive notes https://www.buckeyetriumphs.org/gearbox I found an oblique comment suggesting springs differ between models on page of part 1 but not detail. Suggest the easiest method of getting a definitive answer is to ring Overdrive Services (other the other one whose name temporarily escapes me…..) Quote Link to comment Share on other sites More sharing options...
TimW Posted August 19, 2021 Author Share Posted August 19, 2021 19 minutes ago, Nick Jones said: You could try reading through these extremely comprehensive notes https://www.buckeyetriumphs.org/gearbox I found an oblique comment suggesting springs differ between models on page of part 1 but not detail. Suggest the easiest method of getting a definitive answer is to ring Overdrive Services (other the other one whose name temporarily escapes me…..) Thanks for that Nick. Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted August 19, 2021 Share Posted August 19, 2021 That should have read page 5 of part 1 Nick Quote Link to comment Share on other sites More sharing options...
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