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Cummins Diesel 1984 Jeep Grand Wagoneer

Posted in Project Vehicles on March 1, 2012
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Toby Boyer didn’t know he wanted a Cummins-powered Grand Wagoneer, but a few years ago he headed to Moab with his friend Todd Farrand from Mercenary Off-Road for the Easter Safari, and after a week of watching folks climb slickrock and traverse boulder fields he started to get the itch for a rig of his own. On the drive home Toby mentioned wanting a 4x4 and the discussion lasted most of the drive back to California.

Toby wanted a Jeep of some sort and Todd suggested a Wagoneer, claiming he could build one like no other. From there the build snowballed, from a basic cruiser to a trail monster to the diesel wagon you see here. We found them on their inaugural run again at Moab after the two-year buildup and are convinced they built a Jeep to envy.

Under the hood came to rest a 5.9L Cummins from a ’98 Dodge truck followed by a 47RE automatic transmission. The engine has a Power Puck diesel tuner, a FASS fuel air separator, and a custom built intercooler. It’s set up for future air conditioning so Toby can ride in style. Dual batteries with Mercenary custom mounts feed the big starter needed to crank the Cummins as well as the Warn winch up front. The fenders were massaged and custom boxes recessed to hold the dual Optima batteries.

Tech Specs
1984 Jeep Grand Wagoneer
Engine: ’981⁄2 5.9L Cummins diesel, Power Puck programmer, custom intercooler, FASS fuel air separator
Transmission: 47RE
Transfer case: 3.8:1 Atlas II
Front Axle: ’98 Ford Dana 60 4.56 gears, Detroit Locker
Rear Axle: GM Corp. 14-bolt, 4.56 gears, ARB Air Locker, Mercenary Off-Road disc brake conversion
Springs & Such: Atlas custom leaf springs, Poly Performance BBCS shocks, Offroad Design shackles, 3⁄4-inch U-bolts, Mercenary Off-Road spring plates
Tires & Wheels: 39x13.50R17 BFGoodrich Krawler TAs on Hutchinson 17-inch beadlocks
Steering: Lee Mfg. upgraded stock gear box, pump, and hydraulic ram assist; Mercenary Off-Road pitman and high-steer steering arms and links
Other Stuff: Mercenary bumpers, rocker panels, Warn Endurance 12,000-pound winch, Great Lakes diff cover, Driveline Tech driveshafts

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