BigT-DK Posted December 30, 2011 Share Posted December 30, 2011 OD boxes for a saloon are a bit thin on the ground here in Denmark... this got me thinking after browsing this http://www.buckeyetriumphs.org/technical/jod/JOD1/JOD1.htmIt seems 70s/80s volvos used the same OD unit ? I am only 30 mins from Sweden and 1000s of old cheap volvo gearboxes :)I will need a new mainshaft and some flange swapping maybe? Can it be done? I think it would come 2 about £200-250 for the gearbox and mainshaft... to clarify I would be adding the OD to my own Triumph gearbox and flog the volvo remains..what is the going rate for a second hand "original" Triumph Jtype box these days? Link to comment Share on other sites More sharing options...
thescrapman Posted December 30, 2011 Share Posted December 30, 2011 I have seen secondhand J-type saloon boxes go from £30 upwards on Ebay, seem to be a bit higher now-a-days.Can go for over £200 though, usually when a TR owner wants one to convert.Always much cheaper than A-type boxes.The expensive bit is the adaptor plate between the gearbox and overdrive, and the mainshaft a close second.I beleive the Triumph traders regularly used Volvo and Ford overdrives.CheersColin Link to comment Share on other sites More sharing options...
GT6 M Posted January 2, 2012 Share Posted January 2, 2012 be wary, the ones fitted to the volvos were called P Types, had a 27% reduction, and a different rear end. So if getting one of these, then you will need to mod the rear end,to mate to your propIm no to sure, but i think you will be able to use the Triumph main shaft, as it will still mate with the OD splines. Steeve Tigger, should be able to say, as He bowt yan, Marcus Link to comment Share on other sites More sharing options...
BigT-DK Posted January 2, 2012 Author Share Posted January 2, 2012 Yeah,I've done some more googling and the volvo ODs came with 25% 27% and 28% reduction... the more the better for high-speed cruising no? ;DThey also come with a range of rear flanges - one of them is a straight swap....I have two spare non OD triumph boxes - and will try to get hold of some volvo units... (there is a US site with lots of info on the different bits needed to fit the volvo unit to a TRBox) Link to comment Share on other sites More sharing options...
Tim Bancroft Posted January 2, 2012 Share Posted January 2, 2012 My mk1 (SU) has a 28% overdrive unit from a Volvo, all very good and gives the car mile crunching ability! Coupled with a 3.45:1 diff gives me 27mph/1000 rpm in O/D top. Link to comment Share on other sites More sharing options...
Lord Sorbington Posted January 2, 2012 Share Posted January 2, 2012 Does such high gearing make it a bit sluggish? I remember driving a 2500S. I always seemed to be having to drop it out of top to get up hills. Link to comment Share on other sites More sharing options...
StagNL Posted January 2, 2012 Share Posted January 2, 2012 Just been looking in my digital archive and found a Volvo service manual in pdf format covering the Laycock J type overdrive. Fitted to both the M41 and M410 gearboxes.The M41 was fitted to P1800, PV, Amazon and 140 models, the M410 to 164 models - generally speaking. M40 and M400 are non-OD boxes.Reduction ratio stated as 0.797:1. Wiki says this in regards to P1800: "Two overdrive types were used, the D-Type through 1969, and the J-type through 1973. The J-type had a slightly shorter ratio of 0.797:1 as opposed to 0.756:1 for the D-type."Canley Classics says this: "Note for information there are two different ratios of J type fitted, with 2.5 cars having a 28% ratio and all others 25%, (the first two figures of the plate on the RHS of the front case is the ratio). In addition some later Volvo units are 27%."The Triumph2000 register website has the specs as thus: D type 0.82:1, J type 0.797:1.Rimmers have the J type listed at 400 quid reconditioned. The gearbox-overdrive adaptor plate is listed as no longer available. Link to comment Share on other sites More sharing options...
BigT-DK Posted January 2, 2012 Author Share Posted January 2, 2012 I have been looking at the m46 box...think this was fitted to 240 and 760 models.. The boxes seem cheap enough in Sweden (even some in Denmark) - adapter plate between OD and gearbox can be sourced in the US but is $$$ (the volvo one is probably wrong) Link to comment Share on other sites More sharing options...
ferny Posted January 2, 2012 Share Posted January 2, 2012 sorbs wrote:Does such high gearing make it a bit sluggish? I remember driving a 2500S. I always seemed to be having to drop it out of top to get up hills.The P1800 ES (130bhp, 1,175kg apparently) here has a j-type and only has overdrive on 4th. It's not nippy and I have to change out of o/d going up long hills but no big deal. I can't remember what its mph/rpm is but it's not far off Tim's. That's actually useful for overtaking - drop down one gear and keep your foot it and you waft pass easily without having to change up at all. Link to comment Share on other sites More sharing options...
Lord Sorbington Posted January 2, 2012 Share Posted January 2, 2012 I'd still be wary of over-gearing your car. Having to drop a gear or two every time you want to change lanes on a motorway can be a real pain in the arse. Link to comment Share on other sites More sharing options...
Nick Jones Posted January 2, 2012 Share Posted January 2, 2012 28% was standard fit on the J-type equipped 2.5 saloons. My A-type equipped saloon would definitely pull a taller top gear.Nick Link to comment Share on other sites More sharing options...
CRAJ Posted January 3, 2012 Share Posted January 3, 2012 Nick_Jones wrote:28% was standard fit on the J-type equipped 2.5 saloons. My A-type equipped saloon would definitely pull a taller top gear.NickI have both types and have always felt that the pi would be better euipped with the 28% from the estate. The estate although quite happy on a flat road, does lose revs more easily than the pi on an incline and would probably be better suited to a 25%.(or a better cam)I prefer the action of the 'A' type in the pi though!Colin. Link to comment Share on other sites More sharing options...
Tim Bancroft Posted January 3, 2012 Share Posted January 3, 2012 Never found the high gearing to be a problem, the old car fairly scoots along! Without overdrive the gearing in top is something like 22mph/1000rpm. Link to comment Share on other sites More sharing options...
CRAJ Posted January 4, 2012 Share Posted January 4, 2012 That's the advantage of a pi though Tim, even if it is on SUs you will still have the pi cam and higher compression, which totally transforms the way a 2500 revs and produces power. A 2500S cam and the lower compression changes the characteristics completely. Link to comment Share on other sites More sharing options...
tiggrr1 Posted January 10, 2012 Share Posted January 10, 2012 796 wrote:be wary, the ones fitted to the volvos were called P Types, had a 27% reduction, and a different rear end. So if getting one of these, then you will need to mod the rear end,to mate to your propIm no to sure, but i think you will be able to use the Triumph main shaft, as it will still mate with the OD splines. Steeve Tigger, should be able to say, as He bowt yan, MarcusMore to follow on this very soon,In short I have managed to fit the p/j type 27% overdrive to my GT6 single rail box.I did not have my camera handy but Gaz took some pics with his camera for me.With luck a bit more detail in the next day or so with the photos. :) Link to comment Share on other sites More sharing options...
Raider Posted January 10, 2012 Share Posted January 10, 2012 tiggrr1 wrote:More to follow on this very soon,In short I have managed to fit the p/j type 27% overdrive to my GT6 single rail box.I did not have my camera handy but Gaz took some pics with his camera for me.With luck a bit more detail in the next day or so with the photos. :)This sounds like a technical story for Club Torque Steve ;) Link to comment Share on other sites More sharing options...
tiggrr1 Posted January 12, 2012 Share Posted January 12, 2012 Just a quick updateI have posted my findings so far in the Technical section under the heading of "P/J Type Overdrive"Steve. Link to comment Share on other sites More sharing options...
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