1989 Chevrolet K5 Blazer

Old-school 4×4. Modern capability.

Merle Hazzard is a purpose-built K5 Blazer designed for serious off-road use while remaining capable of long-distance travel and family camping adventures.

Built around one-ton axles, 40-inch tires, long-travel leaf springs, and extensive custom fabrication, Merle combines traditional off-road hardware with an evolving approach to drivetrain technology, performance, and capability.

Having already tackled trails such as the Rubicon, Merle continues to evolve through real-world experience, with several major upgrades currently in development.

The Build

Engine & Drivetrain

Component	Current Configuration
Engine	Factory 350 TBI V8
Transmission	GM 700R4
Transfer case	NP208, temporary configuration
Exhaust	Full custom stainless steel

Suspension

Component	Current Configuration
Front springs	52" Chevrolet leaf springs
Rear springs	63" Chevrolet leaf springs
Spring hangers	CFM Industries, front and rear
Front shackle hangers	Offroad Design
Rear shackle hangers	Offroad Design
Rear shackles	Offroad Design
Shocks	Bilstein 5100, custom fabricated mounts

Front Axle & Steering

Dana 60 — Kingpin

• 5.13 gears
• ARB selectable air locker
• Chromoly axle shafts
• Heavy-duty differential cover
• Brass kingpin bushings
• RuffStuff high-steer
• PSC hydraulic assist
  

Rear Axle

GM 14-Bolt

• 5.13 gears
• Detroit Locker
• Artec Industries truss
• RuffStuff suspension mounts
• Disc brake conversion
• Heavy-duty differential cover

Chassis & Custom Fabrication

• Full roll cage
• Custom front and rear bumpers
• Rock sliders
• Underbody protection
• Custom bead-rolled aluminum headliner
• Hydroboost braking system

   

Current Development

Modern Drivetrain Conversion

Merle's next major evolution combines a ZF 8HP70 eight-speed automatic transmission, Klune-V 4:1 underdrive, and gear-driven NP205 transfer case.

The NP205 will be clocked upward to accommodate a nearly flat belly skid, improving ground clearance and protection for technical off-road use.

The conversion will also include a dedicated transmission cooler, custom drivetrain mounting, and a full aluminum center console incorporating the new transmission controls and JB Custom Fab triple-stick shifters.

Engine Development

Merle currently runs the factory 350 TBI V8. A 6.0L LS conversion is also under consideration as part of the upcoming drivetrain overhaul, with an emphasis on low-end torque, drivability, and reliability.

Future Development

Merle is an ongoing project, with additional upgrades planned as the truck continues to evolve.

Suspension: Upgraded shocks for the current leaf-spring configuration, with a long-term transition to custom link suspension and coilovers.

Steering: Double-shear high-steer configuration.

Rear Axle: Selectable locker conversion.

Continued Refinement: Additional improvements to drivetrain reliability, vehicle protection, trail capability, and overall functionality.

Follow the Build

Merle's development is documented through Venturi Fab, from fabrication and installation to technical decisions and real-world trail use.

Featured Build Video:

• I'm Putting a Modern Transmission in My Old Squarebody

About Venturi Fab

Venturi Fab was founded by Rob Wertz, a professional fabricator with 25 years of experience across automotive repair, performance modifications, custom fabrication, and vehicle restoration.

With multiple original projects underway and a dedicated 3,000-square-foot fabrication shop in development, Venturi Fab is building a business centered on craftsmanship, technical capability, and lasting relationships throughout the automotive industry.

Explore more: Mr. Jones | Leroy | About Venturi Fab