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There was a 4 speed dg made. Pretty pricey when/if you can find one. I think it was called the dualgate II. I don't believe you can hook up a 3 speed and have all speeds working.
x2. I called and talked to them several years ago and they were very friendly and gave me a lot of information about the kit and installing/adjusting it. I bought one of their kits even though I don't have an OD trans yet so I can't comment on the install. I just figured I'd buy the kit then in case it was discontinued before I got around to doing the trans swap.