I also LOVE Grimlock's parts with Scattershot's body/vehicle (propably you have all seen me in it). I use the Warchargers Decal. It looks cool at the back grill..looks like a race-car.
I love the Cybertronic transformation sound it makes and I like how Grimlocks sholder's open up when you transform to a bot.
I love Grimlocks' dinobot form but I dont use it most of the time becuase it is too big and it makes a hell lota noise and vibrations..but it feels awosome and his ultra-high jumps can take your gameplay to another level.