rattling noise from exhaust, not shifting at wot

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truck shifts fine with normal driving, has rattle noise at full rpm coming from exhaust, hard shift, let off throttle, then hit at wot, dead miss, passenger side of truck is extremely hot on floor board replaced: injectors plugs wires some coil pack intake gaskets knock sensor maf cam sensor crank senor oil pressure sensor full 4wd service-flush sway bar bushings oil cooler lines new cluster