What goes in between

[mack kid]

This is driving me nuts. i figured i would ask before i go blind looking at this computer

First the Build in general terms i ordered the axles for 6x6. at 2.85:1 reduction
also ordered twin buhler 6000 rpm 12v motors with 3:1 mounting plate for 2 motors. I was planing on using tamiya 3 speed. unless you guys have a better idea? i was wondering if anyone put twin motors on anything else besides a tamiya 3 speed. tires are 112mm dia.

What the end result is i wanted a heavy hauler tractor. lot torque. good on grades, decent speed in staight a way.

now have been all over threads here and looooooooooked at a lot transfer cases. god have i looked. but afraid on pulling the trigger on one. i liked the carson 5:1 which mounts right on tamiya 3 speed? pricey too!

so what is a good whatever to go in between. or if iam way off base.we can be adventurous here too.