Mark, you might want to go into the "Custom Options Menu" and check what the Gryphon is loading for your gear ratio and tire size. If I'm not wrong, I think it loads a default setting for each that may have nothing to do with what you've got on your truck. And if you've done all this, forgive me. I read recently somewhere that an incorrect gear ratio can cause symptoms similar to what you describe.
In "Custom Options" for your chosen tune level, first go to "Load Previous Settings" so that what is in the PCM gets put into the Gryphon. Then check and adjust your Gear Ratio and Tire Size if necessary. If your tire size is not right, use Bill's "Gear Ratio Calculator" (part of Pegasus under "Tools"). Put your tire size in the first box like this: "275/65-18" (which is what my tires are) and you'll immediately see your tire circumference in mm with a 5% "squish" factor, which is a good starting point.
I think even with the custom tunes, you're going to have to check and reset your tire size each time you change your tune level. (At least I have to do this with mine).
- Jack
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2024 F150 Platinum SCrew 3.5L PowerBoost FX4, Peragon Tonneau Cover, LineX Bed, 35% Window Tint on All Sides and Rear, Full Nose Paint Protection Film, Husky Mud Guards, Lasfit Floor Liners, VIOFO Dash Cam
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