Mid-1970s Refinement and Performance
The HJ Holden represented Holden’s early-to-mid-1970s design with a modern body, reliable engines, and V8 Monaro performance. By 1976, Holden introduced the HX Holden, which refined the HJ with styling updates, mechanical improvements, and better comfort features, marking a continuation of Holden’s evolution in the mid-1970s.
The HX Holden was a subtle evolution, offering improved drivability, minor styling tweaks, and upgraded comfort while maintaining the strong performance and versatility of the HJ.
Design and Styling Comparison
Exterior Design
HJ Holden:
- Early-to-mid 1970s body with squared lines and slightly aggressive stance
- Sedan, wagon, panel van, and utility variants
- Chrome trim functional; Deluxe, Special, Monaro, and GTS trims enhanced
HX Holden:
- Minor styling tweaks over HJ, including a revised grille and updated tail lights
- Subtle changes to bumpers and trim for a modernized look
- Sedan, wagon, panel van, and utility variants continued
- Deluxe, Special, Monaro, and GTS trims refined
The HX looked very similar to the HJ but had a more modern, cleaner appearance with subtle details differentiating it.
Interior Design
HJ Holden:
- Dashboard with clear instrumentation and functional layout
- Comfortable bench seating for six
- Interior trim modest, upgraded in Deluxe, Special, and Monaro
HX Holden:
- Slightly updated dashboard layout with clearer gauges
- Seats more supportive and comfortable, particularly in Deluxe, Special, and Monaro trims
- Interior trim improved for a more polished feel
- Cabin ergonomics slightly enhanced for better comfort
The HX interior offered small but noticeable improvements in comfort and usability over the HJ.
Platform and Engineering Changes
Chassis and Suspension:
- HJ: Boxed perimeter frame, independent front suspension, leaf-spring rear
- HX: Minor suspension improvements for smoother ride and better handling
- Steering slightly more responsive, body roll reduced
Brakes and Safety:
- Drum brakes standard; optional front disc brakes
- Improved seatbelt mounting and minor safety refinements
- Ride quality slightly smoother than HJ
The HX provided a more comfortable and refined driving experience than the HJ, particularly on longer trips.
Engine and Drivetrain Comparison
HJ Holden Engines:
- “Red” six-cylinder engines: 173, 186 cu in
- V8 engines: 253, 308
- Rear-wheel drive, three-speed manual, optional column/floor shift
HX Holden Engines:
- Same engine range with minor tuning improvements. Revisions were made to comply with emissions laws that were introduced
- V8 engines slightly refined for smoother performance and reliability
- Gearbox and clutch slightly improved
- Rear-wheel drive retained
- Optional floor-mounted four-speed manual on some Monaro models
Performance Comparison:
- HJ: Powerful and reliable, especially V8 models
- HX: Slightly smoother and more refined, minor improvements in drivability
- Both offered strong performance, with HX feeling more polished
Model Range Comparison
HJ Holden:
- 2-door and 4-door sedans, wagon, panel van, utility
- Deluxe, Special, Monaro, and GTS trims
HX Holden:
- 2-door and 4-door sedans, wagon, panel van, utility
- Deluxe, Special, Monaro, and GTS trims refined
- Minor mechanical improvements improved comfort and drivability
The HX maintained the versatility of the HJ while offering more refined driving dynamics.
Technology and Features
HJ:
- Functional dashboard, optional heater and radio
- Focused on practicality and V8 performance
HX:
- Updated dashboard with improved ergonomics
- Optional heater, radio, and upgraded interior trim
- Seats more supportive, cabin more comfortable
- Minor mechanical upgrades for smoother operation
The HX offered slightly better comfort, usability, and refinement over the HJ.
Driving Experience
HJ Holden:
- Solid ride with reliable handling
- Powerful V8 engines for Monaro and GTS models
- Comfortable for family and spirited driving
HX Holden:
- Smoother suspension and slightly more precise steering
- Refined ride quality and improved comfort
- Powerful V8 engines retained with minor improvements
- Cabin more comfortable for passengers
The HX delivered a more polished driving experience while retaining HJ’s performance appeal.
Reliability and Common Problems
HJ:
- Reliable engines and mechanics
- Minor wear in suspension and trim
- Easy to maintain
HX:
- Similar reliability with minor mechanical refinements
- Suspension upgrades enhanced long-term comfort
- Interior trim slightly more durable
Both models are dependable, with HX offering small improvements in comfort and refinement.
Ownership Costs Today
Purchase Price:
- HJ: Collectible early-to-mid 1970s Holden
- HX: Slightly more desirable due to refinement, comfort, and Monaro/GTS popularity
Parts Availability:
- Limited for both; HX parts easier due to later production
Running Costs:
- Both economical; HX offered smoother operation and slightly improved comfort
- V8 models higher maintenance but deliver strong performance
Collector and Enthusiast Value
HJ Holden:
- Appreciated for early-to-mid 1970s styling and V8 Monaro performance
- Transitional classic into the mid-1970s
HX Holden:
- Highly collectible mid-1970s Holden
- Refined styling, comfort, and V8 Monaro/GTS options make it desirable
- Deluxe, Special, and Monaro trims sought-after by enthusiasts
Choose HJ if:
- You want a reliable early-to-mid 1970s Holden
- You value historical significance and classic styling
Choose HX if:
- You want a slightly more refined mid-1970s Holden with improved comfort and drivability
- You value collectible Monaro and GTS variants
Verdict – Which Is Better? The HJ Holden offered bold early-1970s styling, comfort, and V8 performance. The HX Holden refined this with minor styling tweaks, improved suspension, and interior updates, providing a smoother and more polished driving experience while retaining the powerful V8 options. For collectors, HJ is valued for its classic early-1970s appeal, while HX is prized for refinement, comfort, and Monaro/GTS desirability.