TSDP ="two speed dual performance ". Some 1952-1954 400, 450, F450, D450 and S450 type 16600 had electric shift. They were either 6 or 12 vote. If this helps for parts
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E shift 2.jpg (185.3 KB, 62 downloads)
E shift 1.jpg (183.45 KB, 62 downloads)