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Jon B said:
Only the 1940 overdrive will fit the 1934 easily, but they are extremely hard to find. My suggestion is to either purchase one of the new rear end gears which are going to be made, or to replace the 1934 rear axle (and housing) with a more modern one, which has a better gear ratio. These would include certain MoPar and Ford rear axles from the 1960's and 70's. Of course, either the gears, or the entire axles, could be replaced with the original ones, in the future, if you wished to return the car to its original state.
bob ward said:
The later boxes are too bulky, they won't fit into the chassis they collide with the X frame. Been there tried that, it isn't going to work.I don't know if anyone has looked at the possibility of rejigging one of the later boxes into the 1940 configuration.