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A Firefighter Builds A Smoking Hot 2007 Silverado

Posted in Features on August 6, 2015
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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.

Owned by a firefighter who moonlights as a skilled fabricator, this Silverado has everything it needs to be an off-road rager.

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.

Built by Mazulla and installed by Firehouse Fabrications, the long travel front suspension system also utilizes a pair of King shocks. One is a 2.5 Performance Series coil overs featuring an Eibach spring, and the other is a 3.0 Pure Race Triple Bypass.
The rear cage was built by Coffin’s Firehouse Fabrications. King 3.0 Pure Race Triple Bypass shocks connect it to the Pro-Am rearend and a CBR trans cooler is in place too.

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.

Huge 37-inch BF Goodrich Baja T/A tires mounted on 17-inch KMC Enduro beadlock wheels adorn the Silverado.

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.

Coffin designed and worked with Zero Tolerance Fabrication, who did the CAD and plasma cutting before Coffin welded up the front and rear bumpers. They have been Line-X’ed for toughness.

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.

A pair of Twisted Stitch bucket seats mated with Simpson D3 harnesses, are just what’s needed for those bumpy trials.
Not seen in too many pre runners is the CNC based steering brake but the Art Carr shifter is an off road staple.

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.

The 6L Chevy engine has been upgraded by B3Tuning to now produce 400hp, while the Firehouse Fabrication engine crossmember ties in the suspension system to give it extra strength.

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

A Unique Metal Products air cleaner housing provides the fresh air.

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.

While we were expecting a red truck out of a fire fighter, this Silverado has everything it needs to smoke the competition.
With the hammer down and the wheel turned, this Silverado slides effortlessly through a dusty desert corner.
Coffin uses every inch of travel while running hard through this whoop section.


MagnaFlow Performance Exhaust
Rancho Santa Margarita, CA 92688
Remac Transmissions
San Dimas, CA _____
Wilwood Brakes
Camarillo, CA 93012
Yukon Gear and Axle
Firehouse Fabrication
CBR Performance
Mazzulla Offroad
Unique Metal Products

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