i have an 06 3500 4x4 6-spd 3.73, and i pull a lot of heavy loads. i'm easy on the truck when pulling, i want manual hubs for reverse when backing heavy loads up hill while twisting and turning so i can put it in the low side without breaking something.
Dynatrac is the way to go. Pricey at about $1700 but if you did it on a brand new truck and you plan on keeping it for 200k or so it would pay for itself in fuel savings and maintenance. I don't know anything about the EMS kit.
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