Note another possibility is I saw once someone made an adapter to hook the rear of a TH400 into the front of another TH400, making the rear trans like a 3 speed auxillary transmission itself, but one you actually could shift on the go, typically converted to a manual valve body. It's possible i'd consider that as well but I don't like how the slush trannies suck power so considered straight gears more efficient.
Yeah, I had forgotten that one!! The second trans had no torque convertor (cut down like a marine case) and the operator had to have some skill in selection (road, load, traffic, etc).
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