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TR2/3/3A Will Spitfire D-type overdrive work in TR3 with TR4 transmission?

Short answer No! Biggest issue will the mainshaft, adapter plate second issue. It could be done but a lot of machine work. You will be better off buying correct A or J overdrive unit.
Marv
 
You wouldn't want to, even if it did fit. The D-type is barely adequate even behind a 1500.
 
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