I talked to a couple people and they mentioned to me that one way to tell is in the shift points and firmness. So I took the truck for a drive, mashed on the pedal from a dead stop, the gears shift very smoothly. I was told if the truck was tuned, more than likely the gear shifts would be pretty firm. The truck reved up to about 50mph in 2nd before shifting to 3rd relatively smoothly. I have a 1990 Silverado that I had put a Hypertech chip in back in the day. I can still recall the shift differences in that truck were very significant. So I am assuming the VHO has the stock ECU configuration.