Okay, I've done exactly this. I used 41-15 tooth gear set for the trans with a 3.909 on 25.3125 dia tires (with weight of the truck on the ground.) My odometer passed the "10-mile highway check" when all finished. I forget what website i used, but it has to have an input for the gauge rpm, cause the mighty max doesn't match the GM standard. 1026revs of the cable is 1mile on the odometer. I ended having to use one of these: https://www.amazon.com/gp/product/B0043PC9Z2/ to deal with limited space in my tunnel/frame/exhaust/etc.

Alright, as for the cable itself, that's a little fun. You'll basically want to get a GM cable, I think i got one for a full size truck or van. It was way too long. If I remember correctly, and I may not be, it's been a while. I think you can take the mighty ends off and put them on the GM cable. You can do this with the help of heat from a torch. I think the MM also had a little crimped pc on the end of the internal line, but i think I pulled off and switched over, maybe (I didn't take photos or notes). Then since the cable was too long I cut it down to length and again used heat to slide teh ends of the outersheath back on. The internal line need to be removed during this process. As for getting the square drive shape back into the trimmed line.. well that's fun. You can buy special dies for a press.. of you can do what I did. I used an cut off wheel to notch two steel plates. basically I made a diamond shape. Then heated up the internal line till it was little red, put it into the grooves of the two plates and smashed it all with a hammer. You can find videos of people doing the press method.. but instead of a large press I just used heat and a hammer.