As if running into burning buildings isn’t work enough, it seems that most firefighters have second jobs. Grant Coffin, 28, is no exception, but his moonlighting consists of building seriously dirt-worthy off-road trucks.
Working under the guise of Firehouse Fabrication, the Anaheim, CA based Coffin (who, with his handlebar mustache sure looks the part of a fireman), is a skilled mechanic, fabricator and long time performance vehicle lover. He used all of these talents when he built his own ride, a 2007 Chevrolet Silverado LTZ.
Coffin began with the front suspension, which uses a Mazzulla Off-road race kit with Mazzulla front spindles, Chromoly and TIG welded uprights along with Mazzulla 2.0 Race Hubs. A pair of King shocks (2.5 x 10-inch) Performance Series coil overs and (3.0 x 10-inch) Pure Race Triple Bypass units per side dampen the bumps. Speaking of which, the King coil overs have been equipped with Eibach springs.
Brakes are a very important piece of the off road puzzle, that’s why Coffin enhanced the stock front brakes by adding Mazzulla Off-road rotors but went all out in the rear with Pro-Am Racing 6 piston trophy truck calipers putting the clamp on Pro-Am 13.5-inch rotors. A Hydroboost conversion coupled with a Wilwood tandem master cylinder and CNC rear brake handle channels the fluid.
The rearend of the Silverado is as serious as we’ve seen in a street-legal pre runner. It consists of a Pro-Am Racing Chromoly housing, a Yukon 3rd member with a Gearworks spool that is equipped with 5.00 Gearworks gears and Strange billet yoke. The Pro-Am 300M 40-spline axles connect to the Pro-Am Racing 2.5-inch hubs and again Pro-Am brakes.
Springing the rearend is done with custom Deaver SUA leaf packs while again it’s a set of King Pure Race Triple Bypasses (3.0 x 16-inch) that got the nod for the rear shocks.
Huge 37-inch BF Goodrich Baja T/A tires, mounted on 17-inch KMC Enduro Beadlock wheels, keep everything rolling smooth over even the knarliest of terrain.
Giving that wheel/tire combination plenty of room to work with are the front and rear Glassworks Unlimited fiberglass fenders. A Chevy 2500HD hood was also swapped in before the crew at Deluxe Hot Rods, Anaheim CA applied the Chevrolet Summit White paint. White? I know what you’re thinking. You were expecting a firefighter to have a red truck, right? Us too.
Anyway, Coffin built the front and rear bumpers, even the sweet engine crossmember, with a little help from Zero Tolerance Fabrication who did the plasma cuttings and CAD for the plate work. Coffin also fabbed the LED equipped chase bar mounted in the bed.
Though Coffin says that he is seriously considering a roll cage, as it stands now the interior has already seen its share of changes. Gone is the airbag equipped stock steering wheel and in its place is a MOMO unit. A Racepak dash panel replaces the stock dash while an Art Carr shifter now paddles the tranny. A pair of Twisted Stitch bucket seats complete with Simpson D3 harnesses keeps everyone in place. Coffin upgraded the stock stereo too as it now has a Pioneer Apple Carplay unit with a 12-inch Vibe sub recessed into the floor.
The Chevrolet LS2, which displaces 6.L, has also seen a few upgrades thanks to the crew at B3Tuning in Eagle Rock, CA. Though the injectors are stock, the intake manifold is an LS3 unit. The heads are L92’s and the crank is cast nodular iron with undercut and rolled fillets.
A huge UMP canister style air cleaner provides the clean air while a set of Dynatech Stainless Steel long tube headers connects to the outside via a Magnaflow Stainless Steel tube and muffler system. The dyno proves that the horsepower is 400 @ 5200rpm
Getting that power to the Pro-Am rearend is done with a Stage 2 4L80E transmission with 300M components and a Vigilante dual disc torque converter. A CBR dual pass trans cooler is mounted to the bed cage. The transmission work done by Remac Transmissions of San Dimas CA while the OC Driveline in Placentia CA built the custom 2 piece drive shaft and equipped it with 1350 joints.
It’s hard to believe that this Silverado was once lowered and sitting on 24’s, but Coffin had grown up on hot rods and classics. It was hanging with his buddies, who were all into off-road, that he finally got the itch to do it in the dirt. When he started to rebuild the truck, Coffin says that his goal was to have a truck that could be used hard, then pressure washed and be good as new. He credits Chris Mazzulla with helping him during the build but says that thanks to his enjoying the “tedious parts of the build and the attention to detail” that has led to him having the truck of his dreams.