Wheeljack: Movie Concept

Wheeljack, movie style!
Wheeljack, like in G1, is one of the head Autobot technicians, but he never created the Dinobots. They already existed on Cybertron, so he was good friends with Grimlock before the War. The Dinobots weren't made into a group until after the events on the bottom of the page(some of it got cut off).
Grimlock was initially a Decepticon lieutenant and was given orders by Megatron to destroy the Autobot labs, which he does. Then he stumbles upon an almost-offline Wheeljack. After Wj received repairs, Grimlock vows never to be a Decepticon again and fights Megatron(who remains undefeated until 2007). Wheeljack brings the news that Prime wants Grimlock to lead the Dynobots(not Dinobots because they had not yet become dinos).
Wheeljack has retractable miniguns in his arms and converts into one of those brand-new Cadillacs(pick one, I don't care).