Mowdoc, that's exactly what I needed to know! I'll definitely look at the 5 Star Tuner instead. Like I said, I am actually pretty happy with the power, but the shifts could definitely be better. Also, I don't really want to blow my warranty if I can help it. Concerning the power, I looked at a video from "Gone with the Wynns," a young hip full-time RV couple who went from a diesel Fleetwood to a gas Fleetwood Bounder. They were really down on the F53's power, likening it to driving around a diesel with the parking brake on. Also, he complained bitterly of the sway and rolling of the chassis. I haven't really experienced either of those issues on my Jayco Precept, but I've also never driven a diesel either. Are you pretty happy with the engine performance of yours, especially with the heavier chassis? Once again, thanks for your help. You saved me a lot of money.
2015 Jayco Precept 29UM
2014 Wells Cargo Road Force 7x12 vnose
2000 Gulfstream Conquest Sport C class Chevy 454