Grimlock and Wheeljack were the 2 Mustangs for that line. they were also the worse to transform.

Grimlock is a supporting character in Transformers: Age of Extinction and a minor character in Transformers: The Last Knight. He is the leader of the Dinobots who transforms into a mechanical Tyrannosaurus rex and is part of the Legendary Knights.

Grimlock is among the strongest of the Transformers, possibly an equal to, or even superior to Optimus Prime and Megatron in most continuities. In Tyrannosaurus rex mode, his jaws can snap virtually anything that comes between them. He is able to breathe fire and shoot an energy ray from his mouth.

Inspired by dinosaur fossils, Wheeljack and Ratchet built Grimlock, Slag and Sludge, who promptly went on a rampage. Wheeljack convinced Optimus to lock up the Dinobots, rather than destroy them.

In his Dinobot/T-Rex Mode, Grimlock's strength is somewhat stronger than his Cybertronian Form, his jaws are so powerful, he can bite through virtually anything (unknown if he can actually bite through the apex armor), Grimlock can also eat Decepticons up (though it does not power him up like Chompazoids do).

Grimlock is a Dinobot, one Bumblebee's teammate and a new teacher of the Rescue Bot Training Center. At first Hoist is scared of him because he was scared of Dinobots. He is scared of cats like Mister Pettypaws.

The Tactical Military Carabiner Tactical D-Ring grimlock Carabiner 5 Pack are small & lightweight multi-purpose tool is used to connect your tools and accessories to belt loops or MOLLE webbing on bags, backpacks, vests, and more.

"Grimlock is a thick-headed, aggressive bot who can change forms into a Tyrannosaurus rex. He teams up with Optimus Prime and the Autobots to defend Earth from dangers unknown."

From Transformers Wiki The name Grimlock may not have a proper translation in human languages, but it definitely holds meaning. Individuals with this name are usually fierce fighters with tremendous power, many of whom struggle with and straddle the line between "hero" and "villain".

Unicron Weak only to the power of the Autobot Matrix of Leadership, Unicron is easily the most powerful of all the Transformers.

Grimlock is among the strongest of the Transformers, possibly an equal to, or even superior to Optimus Prime and Megatron in most continuities. In Tyrannosaurus rex mode, his jaws can snap virtually anything that comes between them. He is able to breathe fire and shoot an energy ray from his mouth.

Optimus Prime In the original toyline and animated series The Transformers, Optimus Prime (called Big Convoy in Japan) is shown as the leader. His label of "Prime" is indicated to simply be part of the name he adopted when he became a soldier (his original name being Orion Pax).