We have same setup pretty much sounds like (trucks in sig) I’ve run my 120hp like ramit and that’s been my go to. I just started running tune 5 this past week to see if there’s a difference in fuel eco....it still drives and shifts very different going from 120-200(all out). I usually keep throttle below 35% at take offs and only get on it when locked (unless something is going on out of my control. Ray says 120 is the safest limit to run...obviously it’s a bit of a loaded question of how much a stock truck will take but on avg 120 will serve you right thanks to Rays knowledge of the trucks and transmission
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