On Gridlock when you spawn on the right side turn left so you're looking at the main tower and there is some flower pots.
There is also a truck you can climb onto, walk up to it and take cover.
Push your left analog stick left and it will come up with an icon telling you to turn left.
Do the crab walk at the truck.
Once you have done the crab walk go to the back of the truck and your legs should be moving.
Turn your person so he's facing the right.
Wait for 2:30 sec and then press: B + left analog stick backwards, A left analog stick forward + A.