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F4000 Project with Mickey Thompson 46 Tires, Cummins 6BT Engine, Shortened Chassis and F250 Bed Born to be a Heavy Trail Pickup.
The F4000 that was born to work and haul loads became a celebrity in the city after appearing in a viral video with Mickey Thompson 46 tires, nearly half a meter wide, a shortened chassis, and an F250 bed. Now, with a Cummins 6BT engine and two 22,000-pound winches, it has shifted from being just a sturdy pickup to an extreme project designed to tackle heavy trails and still steal the spotlight in traffic.
Seen for the first time amidst the normal flow of cars, this F4000 looks like a trail truck lost in the city, with height, width, and presence that make anyone check the rearview mirror twice. What started as a factory-original F4000, with a long chassis, has been disassembled, shortened, adapted, and rebuilt to a level of detail that blends passion for off-road, handcrafted engineering, and a touch of controlled madness.
An F4000 That Became a Star After a Video in Traffic
It all began when the content creator saw the monstrous F4000 in the middle of the street, shot a quick video in the traffic, and published it on social media.
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The result surpassed 800 thousand views and turned the pickup into a topic among pickup and trail enthusiasts.
After the viral moment, the meeting with the owner took place to understand up close what had been done. And it wasn’t just a distant impression.
Up close, the F4000 is even more exaggerated, with giant tires, truck height, and posture of a vehicle made to tackle any type of heavy mud.
Although it visually resembles an F250 due to the bed and cabin, the owner insists on emphasizing.
The base is from an original F4000, that long factory version, with an extended chassis and a vocation for heavy-duty work.
Mickey Thompson 46 Tires with Almost Half a Meter Wide
The first visual shock comes from the tires. The F4000 uses Mickey Thompson 46 in height, mounted on a set that delivers around 48 centimeters in width, practically half a meter of rubber digging into the ground.
In front of the car, with the hand resting laterally on the tread, you can get the real dimensions of the set.
It’s the type of tire that transforms any pickup into a toy of exaggerated proportions and, at the same time, demands fine-tuning of suspension, axle, and transmission.
The owner says he ordered the set of tires from Paraguay since he couldn’t find this model in that size in Brazil.
According to him, he managed to buy the last four available in a store in Asunción, which adds another layer of exclusivity to the project.
Shortened Chassis and F250 Bed: F4000 with a Looks Like a Leisure Pickup
Initially, the F4000 came with a long chassis, a work-body and the typical proposal of a light truck. In the current project, the chassis was carefully cut and shortened, respecting structural alignment, to receive the bed of a F250 Power.
The rear axle remains the original one from the F4000, configured for dual wheels in the back. The space still accommodates four tires, two on each side, even with the bed adaptation, which shows that the heavy-duty utility base has been maintained.
The combination of shortened chassis, F250 bed, and F4000 wheels creates a hybrid visual identity. From the outside, many people take a glance and think of an extreme F250.
On the inside and in the structure, the backbone is still that of an F4000 built to withstand trail hits and real effort.
From 4BT to Cummins 6BT: When the F4000 Needed More Engine
Originally, the F4000 came equipped with a Cummins 4BT four-cylinder engine, designed to work with weight and durability, and not to spin giant tires in the mud. Over time and with the increase in tire size, the limits of this setup became apparent.
On a trail in Bela Vista, the owner recalls a situation where, with larger tires and heavy mud, the pickup sank in the middle of the lagoon and had no power to get out. The F4000 would stop, the tires would dig, the mud would swallow the setup, and the pickup would become an anchor.
That’s when the radical decision came. To remove the 4BT and install a Cummins 6BT, a six-cylinder engine used in trucks, known for its brute torque and capacity to push much heavier vehicles.
After the transformation, the F4000 changed levels. The owner says the overall behavior of the pickup on the trail was completely different.
Where there was previously a lack of breath with the large tire, now there is plenty of torque to start, resume, and maintain rotation even in deeper mud situations.
Trail Preparation: Metal Bumper, Two 22,000 lb Winches and 100% Lock
It’s not enough to have a strong engine and giant tires. To serve on the heavy trail, the F4000 received a complete package of protection and rescue.
In the front, it gained a reinforced iron bumper, with a 22,000-pound winch embedded, sized to pull not only the pickup itself but also other stuck vehicles.
At the back, another 22,000-pound winch was installed, ensuring there is a rescue option both pulling forward and reversing.
The front was redone in forged steel, with a reinforcement from end to end developed by a specialized company, designed specifically for extreme use.
The F4000 also features 100% locking on the front differential, of the Kaiser type, to maximize traction in situations where only one tire would maintain contact with the ground.
In the traction setup, the owner opted to install an Easy Traction system instead of the original button activation on the dashboard. The idea was to reduce the risk of electronic failure on the trail, preferring a more direct and predictable system.
Raised Suspension, Heavy Pads and Speed Limit Due to the Set
To accommodate the Mickey Thompson 46 tires, the F4000 needed to be raised in stages. First came a lift to ride with a set of harvester tires, around 44. Then, with the switch to the 46 tires, it was necessary to increase the spacing even further.
The owner mentions spacers around 27 centimeters, with one spacer over the other, resulting from two different modification moments.
The result is an extremely tall F4000, with an additional step over the original step to be able to climb with some comfort.
On the street, the set influences the dynamics. Even with balancing done as much as possible, the owner admits that it doesn’t go over 70 to 80 km/h, because the giant tire doesn’t allow a perfect adjustment, and any asphalt bump generates vibration.
On better asphalt, the ride becomes smoother, but still, the project’s proposal is not speed but brutality at low speeds.
F250 Interior, Comfort in the Cabin and Refrigerator for Outings
On the inside, the F4000 inherited much from the F250, with the traditional pickup interior, leather seats replacing the original ones, and a configuration designed for trail use and longer outings.
Among the highlights is a Resfriar refrigerator installed in the cabin, to keep drinks cold during the trip or at campsites, which fits well with the style of the pickup, made to leave the city and tackle longer trails.
Despite the rough appearance outside, the F4000 cabin is comfortable and functional, with pleasant sound, air conditioning, and modern pickup ergonomics. It’s a curious mix of mechanical brutality and daily-use conveniences.
Pressurized Water, Adapted Bed and Structure Designed for Real Use
In the bed area, a special job was done on the stainless steel structure and the installation of a top water tank, designed for bathing on the trail and general field use. The system allows the F4000 to serve as a complete support base in longer displacements.
In addition, the pickup features both old and modern implements that dialogue with the owner’s routine, who is also connected to the world of tereré and mate.
The vehicle tows special trailers, participates in trails, events, and recordings, always focused on showcasing the project in action, not just parked in display.
How the F4000 Behaves on the Trail and Where It Finds Limits
On dirt, the F4000 shows what it was made for. The Mickey Thompson 46 tires offer an absurd grip, and the Cummins 6BT engine supports the setup even in situations of continuous force. In many terrains, the truck descends, ascends, crosses, and exits without drama.
But, like any extreme project, there are limits. The owner reports that in very clayey and soft mud, the F4000’s high weight and tire area can work against it.
The tire gets filled with mud, becomes slick, and the vehicle sinks quickly. In such soils, he avoids entering knowing that the rescue can be laborious, even with two winches and front locking.
Even with this caveat, the assessment is clear. In the right type of trail, the F4000 is a spectacle in itself, with an aggressive look, the roar of the 6BT, and the ability to overcome obstacles that would stop many original vehicles.
F4000 Project That Never Ends: There Is Always Something to Improve
Those who work with trails often say that a prepared car is never finished. With this monster F4000, the logic has been confirmed.
Each stage seemed like an end of a cycle. Shortened chassis and F250 bed. Next, larger tires. Then, the 6BT engine.
Next, front locking, then axle reinforcement, winches, rack, tent, water tank. When it seemed finished, a new improvement idea would arise.
The owner still plans, for example, 100% locking also on the rear differential, which would take the F4000 to another level of traction in extreme situations.
It’s a living project, in constant evolution, that accompanies the experience of each trail and the perception of the weak points that arise.
In the end, this F4000 is not just a weekend toy. It’s the result of years of adjustments, tests, right and wrong, combined with the passion for big pickups and heavy trails.
And you, would you have the courage to face daily life or a heavy trail with an F4000 of this size, or do you think a project like this is an exaggeration even for those who love off-road?
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