The Fesler OBS shop truck, which we call Project Shoptruck, is a GMC Sierra crew cab built ground-up in our Phoenix shop on a custom frame, with a supercharged LS making over 1,000 horsepower and a full Fesler interior. It is also the development truck behind our 1988-2000 OBS truck parts, so our OBS interior parts get mocked up and proven on it before they go to production. Here is where it has been and what is on it.
This is the truck people keep asking about at shows. So this is the build sheet, laid out plainly, using the same information we publish on our projects page and the full Project Shoptruck build page.
What is the Fesler OBS shop truck?
It is a 2000 GMC Sierra crew cab on the GM OBS platform, the GMT400 trucks that ran from 1988 into 2000. We built it as a development build, not a trailer queen. The frame is fully custom and so is the bed. The paint is flat red. Nearly everything that matters on it was built in-house.
The truck has a second job that matters more to anyone building an OBS of their own. Door panels, kick panels, the dash, the console, seats, headliner and A-pillars all get mocked up and refined on this cab before they go to production. It sees Phoenix traffic, freeway pulls and real parking lots. When we sign off on an OBS part, it has lived on this truck first.
Where has the shop truck been shown?
Its big win so far came at Concours in the Hills in Fountain Hills, Arizona, on February 14, 2026. The show is held at Fountain Park and raises money for Phoenix Children's. We mostly wanted to get the truck out, let people see it in person and talk builds. It went home with the People's Choice award. You can see the photos in our People's Choice recap.
What stood out that day was where people looked. They leaned into the cab, pointed at details and asked what materials we used and how certain pieces were finished. That made sense to us, because the interior is where most of our development on this truck happens.
Next up is Dino's Git Down, the free Chevy and GMC show at State Farm Stadium in Glendale on November 13 and 14, 2026. We are bringing the red OBS and a couple more builds out of the shop. Friday is trucks only and Saturday is open to any GM car or truck. Our Fesler events page has the details and a signup for the email that tells you exactly where our booth is in the lot.
Fesler OBS shop truck build sheet
This is the short version. Every line below comes from the published build sheet for the truck.
| Platform | 2000 GMC Sierra crew cab, 1988-2000 GM OBS (GMT400) |
|---|---|
| Build type | Ground-up Fesler development build, Phoenix, Arizona |
| Engine | Supercharged GM LS |
| Supercharger | 6.7L Whipple |
| Power | Over 1,000 horsepower |
| Cam and heads | Texas Speed cam, Corvette-built heads |
| Front of engine | Concept One pulley system, custom headers |
| Rear end | Moser Engineering billet 9-inch, 4.11 gears |
| Frame and bed | Fully custom |
| Suspension | RideTech, Air Lift Performance air management, VIAIR compressors |
| Brakes | Baer, with Hydratech Hydra-Boost assist |
| Wheels and tires | Schott forged wheels, Continental tires |
| Gauges | Dakota Digital in a custom Fesler cluster |
| Interior | Hand-built Fesler interior in Moore and Giles black leather |
| Audio | Morel speakers, Kicker 10s and amps, Stinger 12-inch touchscreen head unit |
| Paint | Flat red by American Icon Finishes |
Under the hood: a supercharged LS
The engine starts with the GM Performance LS platform and a 6.7L Whipple supercharger on top. A Texas Speed cam and Corvette-built heads wake it up, custom headers get the air out, and a Concept One pulley system cleans up the front of the motor. An AIRAID intake feeds the blower and a Black Widow exhaust handles the sound.
The supporting pieces are the ones that make a build like this livable. The engine harness is from Wired by PSI, the battery is an Odyssey AGM unit, and the tune came from All Out Tuning and Performance. It now makes over 1,000 horsepower. It was built to be driven, and it is.
Chassis and stance
A heavy crew cab with this much power needs a chassis that can keep up. The frame is fully custom, and so is the bed. RideTech suspension and an Air Lift Performance air management system set the stance, with VIAIR compressors feeding the air side. That lets the truck sit low when it is parked and still drive right when it is not.
Out back is a Moser Engineering billet 9-inch rear end with 4.11 gears. Baer brakes handle the stopping, and Hydratech Hydra-Boost gives the pedal a firm feel. The truck rolls on Schott forged wheels wrapped in Continental tires.
The OBS crew cab interior, hand-built in Phoenix
This is the part that drew the crowd at Fountain Hills. The interior was hand-built in our Phoenix shop. Moore and Giles black leather runs throughout, over a custom metal dash, Fesler OBS door panels and kick panels, a hand-built center console, custom seats matched to the panels, and a full custom headliner with matching visors and A-pillars. Billet handles round it out.
The Dakota Digital gauges sit inside a custom Fesler cluster in that metal dash. Wiring is routed the way we would want it on any high-end build: serviceable, hidden and not fighting the design. A Sparc Industries steering wheel sits on an ididit column, the shifter is from Hurst, and Nu-Relics power windows run the glass. Restomod Air handles climate, with vents that light up, and a push-button start fires the motor.
The door panels and kicks were designed around the audio. Morel speakers fill every door and kick panel, Kicker 10s and amps cover the low end, and a Stinger 12-inch touchscreen runs the dash. The whole cab is wrapped in Dynamat to keep road noise and rattles out. American Auto Wire wiring runs behind the switches and screen, and molded carpet from Auto Custom Carpets finishes the floor.
Which Fesler OBS parts came off this truck?
The interior on the shop truck is the blueprint for our production OBS interior line. Two of those pieces are in the catalog right now:
- OBS crew cab door panels: a set of four in hand-laid fiberglass with a smooth gel-coat finish, for 1988-2000 Chevy and GMC crew cab trucks and Suburbans, at $1,499. They take 6.5 inch speakers front and rear and are laid out for power windows, with the switches moving to the console.
- OBS kick panels: hand-laid fiberglass for 1988-2000 Chevy and GMC trucks, Tahoes and Suburbans, at $349. They are designed around a 6.5 inch speaker, and a flat version needs no cutting.
The truck is also the development platform for our OBS flush-mount glass, made with our partner Pilkington USA. Prototype glass installs and seal testing happened on this cab. If you are building a 1988-2000 truck, the OBS collection is where the glass pre-order, smooth cowl, Dakota Digital gauge kits and the rest of the program live.
One thing worth saying plainly: the shop truck is a one-off. You can borrow a lot from it without cloning it. Start with the parts that change how the truck looks and feels inside, then build out from there.
Frequently asked questions
Is the Fesler OBS shop truck for sale?
Yes. As of this writing, the truck is listed as available on our projects page at $200,000. Call 480-748-2000 for full details.
How much power does the Fesler OBS shop truck make?
It now makes over 1,000 horsepower. That power comes from a supercharged GM LS with a Whipple supercharger, a Texas Speed cam, Corvette-built heads and a tune from All Out Tuning and Performance.
Which parts on the truck are Fesler-built?
The door panels, kick panels, console, custom metal dash, headliner, A-pillars, seats and cowl are Fesler pieces or development versions of them, along with the full custom suspension setup. The interior was hand-built in our Phoenix shop.
Can I buy the same OBS interior parts for my truck?
Some of them, yes. The OBS door panels are a set of four for 1988-2000 Chevy and GMC crew cab trucks and Suburbans at $1,499, and the OBS kick panels fit 1988-2000 trucks, Tahoes and Suburbans at $349. For anything else you see on the truck, call us and we will tell you what is available.
Where can I see the Fesler OBS shop truck in person?
We plan to bring it to Dino's Git Down on November 13 and 14, 2026 at State Farm Stadium in Glendale, Arizona. The exact booth location goes out to our email list the week of the show.
Want to see it before Dino's, ask about buying it, or talk through your own OBS? Browse the 1988-2000 Chevy OBS truck products or call us at 480-748-2000.
Sources: Phoenix Children's Foundation (Concours in the Hills date, venue and beneficiary).
Leave a comment
This site is protected by hCaptcha and the hCaptcha Privacy Policy and Terms of Service apply.