Ford F550 Severe Duty Stage 1

Startracks Severe Duty F-550 Stage 1 trucks are built with military technology for civilian applications for extreme traction, stability, high payload capabilities and clearance in a low profile truck. These powerful trucks are available in all colors and with and without any body style. Designed as a replacement for the Hummer H1 and the Unimog U300, these are “America’s Ultimate Truck.” Battle proven components that will be working hard for years to come! Now Available in 6×6 Wheel Drive!

Ford F550 Upgraded to Severe Duty Stage 1

Severe Duty Stage 1 Upgrades:

  • F550 4×4 or 6×6, wheelbases available from 141 – 201″ wheel bases 6×6 available on 165″ or 182″ wheelbase.
  • 6.7L Power Stroke™ Turbo Diesel or
    6.2L 2-Valve V8 Gas (FFV)
  • TorqShift® 6-speed SelectShift Automatic
  • High capacity trailer tow package
  • 22,500 GVWR Rated Axles available
  • 12,000 lb rated, Dana 80 Ford front axle available Installed with No suspension lifting required
  • 14,000 lb Ford Dana 130 rear axle
  • (4) 20 x 10 Aluminum, 3 piece, powder-coated or polished wheels
  • (4) 365 80 R20 tires, 44″ tall or 335 80 R 20 tires, 42″ tall, Goodyear or Continental available
  • Optional internal bead-locks with runflats in each wheel, mounted and balanced
  • HD replacement front and rear sway bars with double capacity available
  • Factory replacement fenders clear a 42′ tire with no lift kit required.
  • Ford replacement gear ratios of 5:38 Front and rear are available.

Differential Gear Sets for both Front & Rear Axles: To run the super single tires and wheels on the F550 we recommend you replace the factory front and rear gears with the 5:38 gear ratio. This (with Ford factory adjustment) will make the speedometer, odometer, TCM, ABS and transmission shift points perform properly with the larger tires and wheels. If you do not change the gears, the speedometer will be off by 18MPH at speed, the odometer will be %30 faster than reality and the transmission will struggle to find correct shift points for power. Changing the gears also multiplies the torque at the ground on the larger tires. To our knowledge we are the only company in the world to offer the 5:38 gears for the Dana S130 rear axle. You can buy the front ratio most anywhere. This is a simple install that can be done by any mechanic locally.

Fenders: If you are running the front super single tires on the F550, we have our own fiber glass blend fenders that bolt onto the F550 and allow the 42” tires with only 2 inches of lift on the front axle. They also have a ¼” sun fade resistant plastic rock guard liner. Fenders can be run on “stage 1” or “stage 2” trucks.

Rear Hub Spacers: If you want the rear axle wheel mounting surface to be the same width as the front axle, we offer machined billet hub spacers that bolt right on to the rear axle and provide a proven solution so the rear wheel can face out just like the front wheel. The tire tracking front to rear is the same width overall. Without these hub spacers the rear wheel will run “dish out” and will perform just fine. These are primarily for cosmetic purposes.

Wheels and Tires: The wheels are 3 piece aluminum 20 x 10 with a powder coated steel plate center in the F550 reversible bolt pattern. They flip from front to rear to provide an exact same track in the rear. They come stamped DOT approved and are rated at 13,000 pounds per wheel and 8000 pounds per tire. Options include the 3 piece bolt together run flat/bead lock insert, and the 335 80R 20 Continental MPT 81 tire. Or you can order any of these as separate units, mounting and balancing.

Various 6 Wheel Drive Builds 2016-2018

Ford F-550 Lariat 6×6 with Three-Way Tilting Bed

Fenders, Wheels and Tires

Mailing Address


Custom Duty Specialty Vehicles
1800 Markel Ave
Elkhart, IN 46517-1322
Phone: 574-596-5331

Hours: 8am to 5pm Weekdays
or by Special Appointment.

Because custom builds vary, some are more complex than others. Due to this, there isn’t any standard price sheet available for cost review. Each truck build requires customer provided specifications, type of frame and components, and other details for an accurate quote. We are sorry for the inconvenience and sometimes frustration for lack of transparent pricing in this industry.

Startracks Trucks is a dealer for 6×6 extreme-duty service trucks that reliably perform. With unmatched versatility, the Stage 1 or Stage 2 can accommodate an endless variety of service bodies suited to a range of configurations for emergency vehicles, medical clinics, utility trucks, border protection, firefighting environments, and any other extreme terrain application. We also represent the latest in the severe duty, electric chassis / platform precisely engineered to exceed any current technologies.

Startracks Trucks builds custom trucks to suite the most discriminating buyers who are seeking the best in current design trends and technologies. We are excited to help take truck technology to the next level both in terms of performance and exclusivity. We are building trucks that are designed, tested and proven to perform day-in and day-out. Through the integration of innovations and technologies, we’re continually striving to improve the safety, efficiency and operability of all of our trucks.

Startracks Trucks has served our neighbors, community and country for over 35 years. We understand the pursuits and ambitions of our many diverse customers and we aim to facilitate their travel by providing high quality solutions. Startracks Trucks is committed to providing extreme-duty service trucks that reliably perform the toughest standards. Explore your world without compromise in a our custom trucks, specifically engineered to out-perform duty and cycle.