All ten forward gears and two reverse gears can run in 4 wheel drive. Power comes from the top side of the 4th gear slider on the main shaft. All gears on the mainshaft rotate in the same ratio as the rear wheels. Any gear could be used but 4th is closet to the Elwood gear box which replaces the belt pulley gearbox.
A 660 Elwood sold last month for $16,500 at a PA auction. Click below for completed listing.
The Elwood kit will fit all the way back to '39 M and corresponding W models. The gear that meshes with the 4th gear slider may have to be changed. I dunno. Otherwise it is a bolt on attachment.
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