This 2021 Peterbilt 337 Weldon Conversion is a rare find in the hauler world, with only 46K actual miles on a truck that is barely broken in. Weldon conversions are among the most sought after builds on the market and almost never come up for sale, which makes this one worth a serious look. Built on the Peterbilt 337 chassis with Cummins L9 350HP power and a bulletproof Allison 3000 HS automatic, finished in clean silver over a black leather crew cab interior.

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Table of Specs

Specification	Details
Mileage	45,967 actual miles
Engine	L9 8.9L Cummins diesel
Horsepower	350 HP
Transmission	Allison 3000 HS automatic
GVWR	31,000 lb
Chassis	Peterbilt 337 Weldon Conversion
Brakes	Air brakes
Front Axle	10,000 lb
Rear Axle	21,000 lb, single axle
Rear Axle Ratio	4.30
Wheelbase	206 inches
Fuel Capacity	140 gallons, dual 70 gallon tanks
Wheels	Polished aluminum front and rear
Exterior	Silver
Interior	Black leather crew cab

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More About This Hauler Truck

Weldon is one of the smaller names in the conversion world, and that is exactly why these trucks are so hard to come by. They were built in low numbers and mostly to order, so unlike the more common conversions you will not find a row of them sitting on lots. When a clean one surfaces it tends to move quickly, and buyers who know the brand come looking for them specifically. This is a genuine opportunity to pick up a conversion most people spend a long time hunting for.

The running gear here is the combination experienced haulers ask for by name. The Cummins L9 8.9L paired with the Allison 3000 HS is a proven, million mile capable drivetrain that pulls hard and holds up, and the 4.30 rear gear is set up to move weight without straining. Add air brakes and 140 gallons of fuel across dual tanks and you have a truck built to cover serious distance with a heavy trailer behind it.

Inside, the crew cab seats the whole crew in black leather with plenty of room in the back for passengers and gear. The Weldon bed brings the storage and the clean, purposeful lines these builds are known for, and at 46K miles on a 2021 chassis this truck has years of service left in front of it.

The mileage deserves a note. This truck did not go into service until 2023, once the conversion build was finished, so despite the 2021 chassis it has spent only three years on the road. That is why a truck of this age is still sitting at 46K, and it means far less wear than the model year suggests.

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Towing Ability

With 350 HP and the Allison 3000 HS automatic behind it, this 337 is set up to pull large gooseneck and fifth wheel loads without drama. The 31,000 lb GVWR and 21,000 lb rear axle give you real capacity to work with, while air brakes and the 206 inch wheelbase keep the truck planted and stable under load. Dual 70 gallon tanks mean fewer stops on a long haul.

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Final Feature Highlights

• Rare Weldon conversion, seldom available on the used market
• Only 45,967 actual miles
• Not on the road until 2023, only three years in service
• Cummins L9 8.9L diesel, 350 HP
• Allison 3000 HS automatic transmission
• 31,000 lb GVWR
• Air brakes
• Single rear axle, 21,000 lb capacity, 4.30 ratio
• 206 inch wheelbase
• Dual 70 gallon fuel tanks, 140 gallons total
• Polished aluminum wheels front and rear
• Crew cab with black leather interior
• Clean silver exterior

Arriving soon. Call now to get your name on it before it hits the ground. Trades welcome.

Finance & Delivery

• Financing available — call for terms
• Nationwide delivery available — we ship to Texas, California, Florida, and everywhere in between
• Trades accepted — we buy trucks

📞 Call 812-390-4977 — Ask for Alex or Chris. Not sure if this is the right truck for you? Call anyway — we’re happy to walk you through what to look for in a hauler truck and help you find the right match, whether it’s this unit or something else in our inventory.

Premium and Exotic Wholesale, LLC | Bloomington, Indiana | Indiana Dealer #1100963 The Nation’s Authority on Pre-Owned Medium Duty and Big Block Hauler Trucks — SportChassis, Schwalbe, Summit Hauler, Western Hauler, Laredo Conversions, Luxe Trucks, 2L Customs, Freightliner M2 106, Freightliner M2 112, Peterbilt 579, Kenworth T270 and more — hand-selected and shipped nationwide.