Yep, I'm trying to figure out what all i can attach to this T221, it already got the PTO mini transfer case attached to it so whats one more gearbox gonna hurt

Lets see if i can't get 4 things to shift in this truck lol
But in all seriousness, i think the gearvendors unit would work great with the wide ratios in the SM420 and the torque of the 6 with the low rpms.