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Need help with gearbox identification


Luma
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I am working on my Series IIA Land Rover and I have two gearboxes to use and I don't know wich one to choose. The first one is off Series IIA Santana and It's code is E51150390D. I know that D-suffix gearboxes are the best series gearboxes but what confuses me is the E prefix. What does it mean? I can't find anything about the prefixes on the web. Maybe the prefix just marks that it is spanish made Santana?. The second gearbox is also from the IIA with 25435797E code,and I have already cleaned this gearbox its all nice and shiny and the Santana has an inch thick layer of hard mud mixed with oil all over it it would take a day of work to make it clean again and in order to use it i need to transplant bell housing from other gearbox for it. Is it worth the work or should just use the one I originally wanted to?

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I think E prefix are factory recondition units. I had one which I bought as Gen Part recon. The main shaft, lay shaft and gears will be suffix D spec, but the reverse gear and shaft could be anything; my E has a A spec reverse gear with the plain bronze bush rather than later roller bearings. That is a limitation of the original casing not being able to take the later reverse shaft. Which reverse gear and shaft yours has is anyone's guess - you'd have to check it inside to find out.

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So my layshaft is better than on the other gearbox but the reverse gear may be the same in the worst case,so using this D gearbox seems better than the E suffix one... Since I don't feel like opening the whole thing I will just put some extra work in and tidy up the D suffix one,put the bellhousing on and hopefully put it in the car afterwards if I don't find any other info about it. I will keep the E suffix as an spare. Thanks for help.

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