abandonearth Posted December 12, 2023 Share Posted December 12, 2023 Evening all, I am on the cusp of ordering a rebuilt gearbox for my Spitfire which, at some point in its life had a 1300 Dolomite engine put in. Going by the numbers it should have a 3 rail box - but on closer inspection I'm not sure this is what's fitted. I can't strip the interior out as it's my every day car, so I've attached some pictures of what is visible. Hopefully someone will be able to say Ah-ha! If it helps, reverse is lift and to the right. J type overdrive fitted. Quote Link to comment Share on other sites More sharing options...
abandonearth Posted December 12, 2023 Author Share Posted December 12, 2023 I suspect it's this one: https://rimmerbros.com/Item--i-RL1341R Quote Link to comment Share on other sites More sharing options...
glang Posted December 12, 2023 Share Posted December 12, 2023 Yes you have a later single rail box there but I believe all mkIV Spitfires had 3 rail units although after FH60000 they came with J type rather than D type overdrives. I think that Rimmers link shows the wrong type of gearbox. However could both the engine and gearbox from a Dolomite been used in your car? The single rail is stronger than the other and in overdrive form an inch longer. Im not sure if the ratios were exactly the same but if youve been happy with the way it drives the best is probably to replace like for like. The correct unit is here but even then its not simple because two types of input shaft seals were used, scroll and rubber, and as this is in the bell housing you would probably have to get a box to suit... Triumph Spitfire Gearbox Only - Overdrive Type | Rimmer Bros Quote Link to comment Share on other sites More sharing options...
glang Posted December 13, 2023 Share Posted December 13, 2023 An update: it looks like the Dolomite 1300 didnt have an option of overdrive and this was only available for the 1500. Are you sure you dont have a 1500 with an engine number starting DM, DS or YC? Quote Link to comment Share on other sites More sharing options...
Clive Posted December 13, 2023 Share Posted December 13, 2023 Simple answer is reverse position. single rail it is next to 3rd 3 rail next to first (or second, but that side) 1 Quote Link to comment Share on other sites More sharing options...
glang Posted December 13, 2023 Share Posted December 13, 2023 oh its definitely single rail, can see that from the photos but unfortunately its not as simple as that especially when Rimmers advertise a 3 rail with a pic of a single rail😯 1 Quote Link to comment Share on other sites More sharing options...
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