Season 4 - Episode Guide

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

A new client asks for the biggest build yet – a monster school bus capable of driving over sand and water. Redbeard discovers the Mello Yello racecar from Days of Thunder and 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, and the guys make their dreams come true when they build the first diesel Monster Jam truck.

Major league pitcher Jacob deGrom asks them to revamp his OBS Ford, and the diesel guys convert a rare British Land Rover Defender from right hand drive to left hand drive for a client.

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!

When the guys are challenged to a Tuff Truck race by their former mechanics, Chet and Tyson of Goon Garage, Sparks Motors rebuilds a wasp-infested old Jeep and the Goons rebuild a water-logged Blazer.

Heavy D and Diesel Dave source a 1984 AMC Eagle they want to turn into their next big, diesel-powered build.