TRubble Posted August 8, 2010 Share Posted August 8, 2010 Hi Guys,still looking for options on the 4 Speed gearbox. Before you all cry 5 speed conversionI would like to keep the 4 speed in some form if at all possible.It has been suggested by some guys in the know that I could use a spitfire 1500 O/D unit and the necessary shafts to attach to my 4 Speed TR7 box thus keeping thosewonderful ratios and also giving me a little less frenzy higher up. Not to mention the fuel economy.Does anybody have any experience of such a conversion? I realise a little fidling with mounts and prop shaft will be necessary but anybody with practical experience would be a great help in my pondering. :-/ Link to comment Share on other sites More sharing options...
thescrapman Posted August 8, 2010 Share Posted August 8, 2010 What you are proposing to make is already out there, a late dolomite 1850 box.Still don't know if it will fit mind.If it did I suspect lots of people would have done it.CheersColin Link to comment Share on other sites More sharing options...
andy thompson Posted August 8, 2010 Share Posted August 8, 2010 Why wouldn't it fit? Same block and clutch - maybe the propshaft and mounting is the only area in need of customizing - probably not been done as most would just go for the 5 speed. Link to comment Share on other sites More sharing options...
Nick Jones Posted August 9, 2010 Share Posted August 9, 2010 Must be some good reason - very obvious conversion else and never seen / heard of it being done. Maybe tunnel clearance issues - OD is pretty fat and far back?In answer to original question, you could use the J type OD from a 1500 Spit or dolly but you also need the various adaptor castings and the gearbox mainshaft from and OD box. As has already been pointed out, this is all a bit of a waste of effort unless you happen to have all the relevent bits kicking about as the Dolly 1850 box with OD is what you want already..... 5 speed is alot less fragile and parts to fit it already exist!Nick Link to comment Share on other sites More sharing options...
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