Subscriber Spotlight – Shain Chapman

4x4 Magazine 4WD how to article 172

Basic Info

Owner Name: Shain Chapman

Location: co-owner Katemcy Rocks Offroad Park, Mason, TX

Vehicle Make & Model: 1984 Jeep Grand Wagoneer Builder: Robbie Kelly envisioned; Sudden Performance did the engine build, drivetrain mounting and wiring.

Years in sport: 25 years

Drivetrain4x4 Magazine 4WD how to article 184

Wheels Brand & Size: Raceline Avenger 929M

Tires Brand & Size: Cooper Tire SST Pros, 37 x 12.50 x 17


Front Type: re-arched 2” Rancho leaf springs, SOA

Engine: Twin turbo 6.2 liter LS3 (2009 Escalade) w/ cam

Engine Modifications: twin 62 mm turbos. 450 HP/ 420 torque at 7 lbs boost.

Spintech exhaust with electric cutouts

Rear Type: Rancho leaf, SOA

Transmission: 6l80e (2009 Escalade) stock with stall convertor and big cooler.

Front axle: Rebuilt 1980s GM Dana 44

Gear Ratio:           4:10                 Locker: Open

Modifications: high steer by Titan Machine in Temple, Texas.

Rear axle: AAM 10.5”/14 bolt with factory disc brakes Gear Ratio:  4:10            Locker: Gov-loc Modifications: Hydroboost on 4 wheel disc brakes

Transfer case: rebuilt NP 205 with JB Fab twin sticks with custom made knobs by Robbie Kelley Black Label Studios TX

Drive Shafts: Tom Woods

4x4 Magazine 4WD how to article 172Exterior

Front Bumper: Custom built by Off-Duty Powder Works, Weatherford, TX

Rear Bumper: Custom built by Off Duty Powder Works

Colors are 1970’s AMC colors: Champagne white and Metallic Avocado Mist Green

Please include any additional information on back:

Autometer custom shop gauges

Derale tranny and power steering coolers and dual radiator fan set up.

The build was the vision of Robbie Kelly, the original owner. The engine build, install, and performance was done by Sudden Performance in Aledo, Texas.

It is not the crawler my TJ is, but I will say it moves pretty damn fast for a big girl.

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