Re: 2008 4.7 swap into 2002?
Don't think that it will work. The engine itself should not be the problem, but the PCM of the WJ uses a single wire PCI data bus to communicate with the other components, and the WK uses a double wire CAN bus.
JEEP Grand Cherokee 4.7 Lmtd 2004
HID 8000K in low and fog / Quad Squad member
Monroe Reflex shocks /
Pirelli Scorpion ATR 245/65/17/
Transgo reprogramming shiftkit.