The foundation of the CJ-8 is a mandrel-bent, 2x4-inch, 3⁄16-inch-thick Advanced Frame Wor
We met Bruce Johnson in Silverton, Colorado, at the Mile-Hi Jeep Club’s All-4-Fun event. Johnson is an operating engineer hailing from Ashtabula, Ohio, and he has two great passions: Jeeps and diesels. Naturally, he wanted to combine the two so he built a diesel-powered Jeep Scrambler. “I have had a lifelong passion for Jeeps, especially CJs, and I wanted a reliable daily driver that got good fuel mileage. I have always been a diesel nut, too. Everything I own is diesel, including my lawn mower, so it seemed natural to combine my two passions. The CJ-8 is very rare and unique, so I thought it would make for a fun project. It also provides a longer wheelbase, so I have more cargo room and a better ride, but mostly it just looks cool,” Johnson says.
Johnson sourced the Cummins 3.9L 4BT turbocharged engine from a Case backhoe. Modification
Johnson says that due to a lot of planning he didn’t run into any major setbacks during the build of this Cummins 4BT-powered ’85 Jeep CJ-8 Scrambler. “Once the engine and transmission were installed it was just assembly after that. We tried to use as many stock Jeep parts as possible, including power steering hoses, motor mounts, and clutch master cylinder. It went so well we have started many other 4BT swaps including a ’76 Ford Bronco, ’80 International Scout Traveler, ’02 Jeep TJ, and a ’06 Jeep LJ,” he says.
Johnson’s rig is at home on the trail whether that trail is in Ohio or in the high country of Colorado. “I didn’t design it to be a hardcore rockcrawler, but it has handled every trail I have been on at an idle,” he notes. (It’s worth mentioning that if Johnson wants to challenge mega-gnarly technical trails he climbs behind the wheel of his aforementioned ’06 Jeep LJ, which is heavily modified and also Cummins 4BT powered.) The Scrambler is also his daily driver. “I currently drive 120 miles round-trip each day. It is a fun cruiser, but it spends most of its time hauling supplies or pulling a trailer back and forth to work,” Johnson says.
Johnson’s Scrambler is devoid of some of the bolt-ons us wheelers have become accustomed to, but don’t be fooled. Johnson has integrated his rig with a number of very cool mods that are designed to enhance the rigs function while maintaining simplicity and reliability. For example, he lives in the Rust Belt and he drives the rig year ’round, so he has made significant use of fiberglass and stainless steel components to fend off corrosion.
The Scrambler was built from the ground up using parts from a rusted-out ’85 CJ-8 that Johnson procured from the Chicago area. Parts from the ratted-out rig were integrated with a number of commercially available over-the-counter products, and his own ingenuity, to create the rig you see here. When we photographed the rig it had been assembled and driven for about seven years. It looks mellow, but its not.
Owner/Hometown: Bruce Johnson/Astabula, Ohio
Vehicle/Model: ’85 Jeep Scrambler CJ-8
Estimated value: $25,000
Type: 3.9L Cummins 4BT I-4 turbodiesel
Aspiration: Direct injection, turbocharger, K&N air cleaner, custom 3-in exhaust
Output, hp/torque (estimated): 105/265
Transfer case: Dana 300, 2-spd
Front: Rancho 2½-in-lift leaf springs. Monroe monotube shocks
Rear: Rancho 2½-in-lift leaf springs, Monroe monotube shocks
Front: Dana 30/open
Rear: AMC Model 20/open
Ring and pinion: 2.73:1
Wheels: 15x8 Eagle Alloy
Tires: 31x10.50-15 Goodyear Wrangler MT/R
Johnson moved the fuel filler from the passenger-side to the driver-side to accommodate th
Instead of a drop-down tailgate, Johnson designed his Scrambler with a Wrangler YJ swing-o
The front suspension is the standard leaf-spring setup, but it utilizes Rancho 2 1/2-inch-
Power is split to the axles via a Dana 300 transfer case sourced from the ’85 Scrambler pa
The entire inside of the body tub as well as the underneath has been coated in Line-X bedl
Out back is an AMC Model 20 axle and like the front Johnson completely rebuilt it. It has