05 f150 5.4, afe intake, flowmaster 40 series, 4.56 gears 35' tires, edge evo

my truck is tuned level 3 custom, its great but i have to concerns that I hope any of you can help me with

I have my 1-2 and 2-3 shift points at 5400 rpm, and shift firmness at 18 1-2 and 15 2-3, when I shift form 2-3 floored, my belt churps like then engine is spinning faster then the belt, is this bad, will my belt snap, and if so, should i lower my settings on 2-3 shift, or will some under drive pullys and a gatorback belt from troyer fix this problem?

Also any pointers on tunes to get my 35's spinning, they barely churp now, if I put up my idle rpm up, or wot fuel up, or turn the timing up or what

Please help

 

Your setting your truck up for a serious driveline failure. Tuning the engine to be able to spin big 35" tires on pavement is not healthy for the rest of the driveline. Tranny, transfer case, u-joints, driveshaft and of course the rear gears will all suffer a failure of some sort.

But if you really must have it, a supercharger or nitros is the only thing that will give you the power you want.

Do a search of this sight and you'll find others have done what you want to do and have had to repair and replace parts.

But, good luck in your need for speed.