t my 2 cents worth.

First thing I would do is identify the transmission that’s in the Dakota. I’m thinking it’s probably a 500 (904 based overdrive) or 518/46RH (727 Based Overdrive).

I’m not real well versed on the 500s but I am using a 46RH in my 37 Dodge truck. The primary difference between 518 and 46RH is that the 46 RH uses a lockup converter. There are various options for controlling the lockup and overdrive on the 518/46RH. In my case I’m using Compushift to control shift points, lock up and OD but there are simpler/cheaper options. The Compushift is a little pricy but once I got it dialed in a really happy with it.

Hemi 46RH by M Patterson, on Flickr

On the 518/46RH the front of the transmission is basically a 727. The valve body has the same shift pattern as the 3 speed 727 (PND21) with the OD being hydraulically controlled. It’s kind of a plus as any of the aftermarket 727 shifters will work with it (or if you’re so inclined a factory slap stick).

If you go this route I would recommend either 4.10s or 4.56s for gears. With the .69 OD ratio that puts your final ratio in the 3.15 range with 4.56s and 2.83 with 4.10s. I’m using 4.56s with 28” tall tires on my 37 and it comfortably cruises at 75-80 MPH ( at about 2800 RPM…..4.10s would drop it to 2500). It’s also a riot to drive around town in.

Not as exotic as some of the 6 and 8 speed autos but not as complicated or expensive either.