We have an edge box on our 3126. It has four settings, we use the most aggressive, adds 40 hp and 140 lbs torque. REALLY makes a difference in performance of the truck. Have used it for about 30,000 miles now and it makes a real truck out of the 3126. If you have any doubts, it just takes 2 minutes to take the box off, run it both ways and if you do not like it, send it back. When I take mine to shop, I always pull the box off, if I forget to put it back on I can tell in just a minute that I forget, it makes that much difference. Also had to take truck to allison to get transmission reporgrammed, different sifting points with the increased torque. Gene
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