simonr Posted January 26, 2012 Share Posted January 26, 2012 OK, it's not a trivial matter to adapt one to the other - but it is undoubtedly possible. Something along the lines of a coaxial spline adaptor inside a mounting ring adaptor sleeve. I once looked at doing similar for a PTO - but shelved it after someone offered me a daft amount of money for the series PTO I had! It strikes me the same kit could do both. The question I'd like to ask is - do you think the OD would be strong enough? I've seen Series OD's for sale less than £100, so even if the adaptor was £250, it would still be a whole lot cheaper than a GKN or the other one that I can't remember the name of? Just a thought at this stage - prompted by the inspiration of my friend Mo Murphy! Si Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted January 26, 2012 Share Posted January 26, 2012 They might be strong enough in good nick, but just about all of the ODs that you will see for £100 will require rebuilding, I know a couple of years ago they were going for £250 if sold in 'good condition', which they rarely were in all honesty. The other one you are thinking of is the Rocky Mountain OD, £1420(!) There are a couple of versions of the Fairey OD, once it was sold off to whoever it was in the states, the bearings and output shaft were narrowed significantly, and reputedly not so reliable (I know a guy that had one from new, and was very disappointed with the quality when comparing old and new). Biggest issue with the Fairey is the oil capacity, 0.4l, and their tendency to weep it out, even the manual says to check it weekly! If you can ensure oil-tightness then it could well work, and as you say be a huge amount cheaper than GKN or similar.... Quote Link to comment Share on other sites More sharing options...
discomikey Posted January 26, 2012 Share Posted January 26, 2012 mine has sat behind a TDI for nearly 2 years it regularly sits at high speeds no probs and deals with the TDI. just the other day it dealt with this no problem (in low O/D) if it was oil tight it would be great, mine used to throw oil out of the top breather hole. i fixed it now though. and aparently if you run them out of oil they have been heard to self destruct and bits to fly through the casing. Quote Link to comment Share on other sites More sharing options...
simonr Posted January 26, 2012 Author Share Posted January 26, 2012 I know they are not so common, but what about one from an LT95? Si Quote Link to comment Share on other sites More sharing options...
discomikey Posted January 26, 2012 Share Posted January 26, 2012 ooh couldny say on that, never had any experiencve with them 1 piece boxes. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted January 26, 2012 Share Posted January 26, 2012 Heystee automotive make one as well, but you are up in €1200 territory again... http://www.heystee-automotive.com/parts/drvline/overdrive.htm No idea on LT85, sorry. Quote Link to comment Share on other sites More sharing options...
simonr Posted January 26, 2012 Author Share Posted January 26, 2012 The Haystee design looks like it is non planetary - presumably to incorporate synchromesh. It does talk about how it was strengthened to overcome the weaknesses in Fairy overdrives - so maybe they are not genuinely up to the job! There are a couple of Range Rover LT95 OD's on eBay at the moment. By eye, the input helical gear looks similar to an LT230. It is conceivable they used the same gear sizes in LT230's? If so, it could be as simple as an adaptor ring of some sort. Si Quote Link to comment Share on other sites More sharing options...
steve b Posted January 26, 2012 Share Posted January 26, 2012 Using an OD in low is an excellent way to split the casing half on Fairey style (layshaft) OD's as I found out many years ago to my cost no idea re possibility of making a series OD fit an LT230 tho re oil in faireys making a larger tank piped into the filler and level plug would be relatively easy I reckon cheers Steveb Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted January 26, 2012 Share Posted January 26, 2012 Doesn't the Fairey overflow into the transfer box if overfilled? Quote Link to comment Share on other sites More sharing options...
ejparrott Posted January 26, 2012 Share Posted January 26, 2012 Mine doesn't seem to, it also doesn't leak like the previous, which frequently ran empty, but never exploded as people have commented. As a result of not leaking, its rather overful, due to me outting in extra to allow for leakage! Quote Link to comment Share on other sites More sharing options...
discomikey Posted January 26, 2012 Share Posted January 26, 2012 Using an OD in low is an excellent way to split the casing half on Fairey style (layshaft) OD's as I found out many years ago to my cost no idea re possibility of making a series OD fit an LT230 tho re oil in faireys making a larger tank piped into the filler and level plug would be relatively easy I reckon cheers Steveb i didnt mean using the overdrive in low, sorry, i meant using low overdriver (non/out of overdrive) fairey unit doesent overflow, only way it can get rid of oil in a non leaking O/D, is out the breather. i suspect that was half my rpoblem as it was a bit overfilled. Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted January 26, 2012 Share Posted January 26, 2012 fairey unit doesent overflow. Cool, good to know Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted January 27, 2012 Share Posted January 27, 2012 If you're going to the trouble of making adapters etc. are you not half way to just making an OD anyway? Seems to me once you've made the mount plus a coaxial input/output shaft you are then in the position of being able to use the same hardware to make an overdrive, underdrive, PTO, or drive-through PTO which was a rather cool idea kicked about some time ago - basically use the input side to drive a hydro pump, then use a valve block & hyd motor to drive the output side giving very slow, infinitely variable drive. Quote Link to comment Share on other sites More sharing options...
Mo Murphy Posted January 31, 2012 Share Posted January 31, 2012 Si already had the inspiration, I think I just nudged it by accident Are there not LR gears off the shelf that could be used for purposes of an overdrive ? A range of products from one basic unit as FF has suggested would certainly help make the project more cost effective in the long run ? Perhaps a collaboration with a gearbox specialist could prove advantageous ? keep up the good work old chap Mo Quote Link to comment Share on other sites More sharing options...
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