Season 4

A new client asks for the biggest build yet: a monster school bus capable of driving over sand and water. Later, the Muscle brings in his own client build for a gym buddy, a Raptor-style F250.

A new client asks for a monster school bus capable of driving over sand and water; Redbeard discovers the Mello Yello racecar from the "Days of Thunder" movie and finds the perfect buyer for it.

A client asks Heavy D and his crew to turn a Ford F550 into a tough 6x6 farm truck that's also a rolling showcase for biodiesel fuel; Heavy D uses the power of physics to drive a truck on just two wheels.

A client asks Heavy D to turn a Ford F550 into a tough 6x6 farm truck that's also a showcase for biodiesel fuel; the guys make their dreams come true when they build the first diesel Monster Jam truck.

Major league pitcher Jacob deGrom needs his OBS Ford revamped. The guys convert a British Land Rover defender from right hand drive to left hand drive.

The guys pull out all the stops on a build for their lawyer Cole-converting a rare Land Rover Defender from right hand drive to left hand drive. And Heavy D tries to get more money to the shop by parting out a military airplane de-icer.

The Diesel Brothers give a truck overhaul to a local dad who was harassed at a campsite when his F350 broke down. And the guys put together the shop's first-ever diesel Motorcycle, with a Magneto!

After Chet and Tyson of Goon Garage challenge the guys to a Tuff Truck race, Sparks Motors rebuilds a wasp-infested old Jeep, and the Goons rebuild a water-logged Blazer.