Stand in front of the truck. On the left (passenger) side the cylinders are 1, 2, and 3 from the front to the cab. On the other side, they are 4, 5, 6. Firing order is 1-4-2-5-3-6.
On the coil pack, it's 1-2-3 front to back on the left, and 5-6-4 front to back on the right.