I traded my Predator for a Bully Dog pup and am pleased. The Predator acted like it wanted to "destroy" the transmission. It ran really good, but would not shift right. I tried all of the "learn" programs, and gave it some time, but it would not shift right. I pulled my 10k lb trailer with both the 50 and 75 tune, and they towed fine with the PUP. I put it back on the 50 until I get the larger exhaust. The mileage on the predator was just as bad as stock. I hope the PUP will help in that department.

Do you pull your fuses everytime? I had a programmer for my 8.1l and had to pull fuses. I bought a LLY and just got a Power Pup programmer and did not realize you had to pull fuses.