1988 Mack RD685S Overview, Reviews, Ratings & Specs
The 1988 Mack RD685S is a robust Class 8 conventional truck, a stalwart of the vocational and heavy-haulage sector. Produced for an extended period, its durability and no-nonsense engineering made it a favorite. Known for its rugged construction and powerful presence, the RD685S epitomizes classic American trucking. It primarily served as a chassis for various specialized bodies, making specific trim levels less defined than in passenger vehicles. Its popularity stems from its legendary build quality and straightforward mechanics.
The Good
The 1988 Mack RD685S boasts exceptional reliability and brute strength, appealing to practical buyers. Its iconic, imposing design resonates emotionally, while its straightforward engineering ensures ease of maintenance. It's a dependable workhorse built to endure demanding tasks.
The Bad
Potential weaknesses of the 1988 Mack RD685S include rust, particularly on the frame and cab corners, and aging electrical systems. Older units may also exhibit wear on the drivetrain and suspension components, requiring diligent inspection and maintenance.
1988 Mack RD685S: Quick Overview
- Engine Options: The 1988 Mack RD685S was typically powered by Mack's own Endura engines. Common options included the Mack E7 series, known for its durability. Other potential engine choices from Cummins and Detroit Diesel were also available depending on customer specifications and configurations.
- Horsepower: Horsepower ratings varied significantly based on the specific engine chosen. For the Mack E7 engines, horsepower could range from approximately 300 hp to over 450 hp in higher-spec applications. Cummins and Detroit Diesel engines offered similar or even higher power outputs, especially for heavy-duty vocational uses.
- Fuel Economy: Fuel economy for trucks of this era and class is generally measured in miles per gallon (MPG) but is highly dependent on the load, terrain, driving style, and specific engine tune. Expect figures to be in the range of 4-7 MPG for highway driving under moderate loads, and potentially lower in severe vocational applications.
- 0-60 Times: 0-60 mph times are not a standard metric for heavy-duty trucks like the RD685S. These vehicles are designed for work, not acceleration. When unladen, acceleration would be slow by passenger car standards, likely taking well over 20-30 seconds. Under a full load, this metric is largely irrelevant.
- Towing Capacity: Towing capacity is not a single specification but is determined by the truck's Gross Vehicle Weight Rating (GVWR), Gross Combination Weight Rating (GCWR), axle ratings, and chassis configuration. The RD685S, as a Class 8 truck, could be configured for very heavy loads, with GCWRs potentially exceeding 80,000 lbs and reaching well over 100,000 lbs for specialized applications like heavy haulage or pulling multiple trailers.
- Trim-Level Features: As a vocational truck chassis, "trim levels" were less about creature comforts and more about functional configurations. Features were largely dictated by the intended use. Common configurations included different axle ratios, suspension types (e.g., heavy-duty leaf springs), brake systems (air brakes), and various cab configurations (day cab, extended cab). Optional features would focus on work-related equipment such as specialized PTOs, hydraulic systems for dump bodies or cranes, and heavy-duty cooling systems.
1988 Mack RD685S Specifications
Vehicle Information
| Year | 1988 |
| Make | Mack |
| Model | RD685S |
| Trim | - |
| Style | - |
| Type | Truck |
| Category | Heavy Truck |
Manufacturing Details
| Made In | Canada |
| Manufacturing City | OAKVILLE |
Dimensions
| Doors | - |
| Curb Weight | - |
| Gross Vehicle Weight Rating | 330001 pounds |
| Overall Height | - |
| Overall Length | - |
| Overall Width | - |
| Wheelbase Length | - |
| Standard Seating | - |
Engine & Performance
| Engine | 11L I6 |
| Engine Size | 11L |
| Engine Cylinders | 6 |
| Transmission | - |
| Transmission Type | - |
| Transmission Speeds | - |
| Drivetrain | - |
Additional Features
| Anti-Brake System | - |
| Steering Type | - |
Pricing
| Manufacturer Suggested Retail Price (MSRP) | - |
| Invoice Price | - |
| Delivery Charges | - |
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What Problems Does the 1988 Mack RD685S Have?
The 1988 Mack RD685S, being a robust and mechanically straightforward truck, generally enjoys a reputation for long-term reliability. However, as with any vehicle of this age, certain issues are more commonly reported. One significant concern is the susceptibility to rust, especially on the frame rails, cab mounts, and lower body panels. This is a common aging factor for trucks operating in varied climates, particularly those exposed to road salt.
Electrical system issues can also arise over time. Aging wiring harnesses, corroded connectors, and failing switches are not uncommon. These can lead to intermittent faults or complete system failures, impacting everything from lights to engine controls. The complexity of these systems, while less advanced than modern trucks, still requires careful diagnosis.
Drivetrain components, while built to be durable, can experience wear over decades of service. This includes issues with the transmission (manual transmissions were common, and clutch wear is a factor), rear axles, and differentials. Problems might manifest as grinding noises, shifting difficulties, or fluid leaks.
The cooling system is another area to watch. Radiator leaks, hose failures, and water pump issues can lead to overheating, which can cause significant engine damage. Regular inspection and maintenance of the cooling system are crucial for preventing these problems.
While specific model-year recalls for the 1988 RD685S are not widely documented in the same way as passenger cars, it is important to note that any recalls issued for the chosen engine or transmission options (e.g., Cummins, Detroit Diesel) would apply. For long-term reliability, the maintenance history is paramount. Trucks that have been regularly serviced, with proper fluid changes and component inspections, will far outperform neglected counterparts. Owners often report that with diligent care, these trucks can continue to serve reliably for hundreds of thousands, if not millions, of miles.
Electrical system issues can also arise over time. Aging wiring harnesses, corroded connectors, and failing switches are not uncommon. These can lead to intermittent faults or complete system failures, impacting everything from lights to engine controls. The complexity of these systems, while less advanced than modern trucks, still requires careful diagnosis.
Drivetrain components, while built to be durable, can experience wear over decades of service. This includes issues with the transmission (manual transmissions were common, and clutch wear is a factor), rear axles, and differentials. Problems might manifest as grinding noises, shifting difficulties, or fluid leaks.
The cooling system is another area to watch. Radiator leaks, hose failures, and water pump issues can lead to overheating, which can cause significant engine damage. Regular inspection and maintenance of the cooling system are crucial for preventing these problems.
While specific model-year recalls for the 1988 RD685S are not widely documented in the same way as passenger cars, it is important to note that any recalls issued for the chosen engine or transmission options (e.g., Cummins, Detroit Diesel) would apply. For long-term reliability, the maintenance history is paramount. Trucks that have been regularly serviced, with proper fluid changes and component inspections, will far outperform neglected counterparts. Owners often report that with diligent care, these trucks can continue to serve reliably for hundreds of thousands, if not millions, of miles.
How long will the 1988 Mack RD685S last?
Estimating average mileage for a 1988 Mack RD685S is challenging due to its vocational nature, but many have seen service well beyond 500,000 miles. Trucks used for long-haul or consistent vocational work could easily accumulate over a million miles with proper care. Long-term durability is a hallmark; these trucks were built with robust frames and drivetrains designed for longevity. Weaknesses over time primarily relate to the environmental factors like rust and the natural wear and tear on aging components, particularly seals, hoses, and electrical connections. With diligent maintenance, including regular fluid changes, chassis lubrication, and timely repairs, the RD685S is capable of extended service lives, often outlasting many newer, less robust vehicles.
What Technology & Safety Features are Included?
The 1988 Mack RD685S represents a period where technology in heavy-duty trucks was focused on functionality and durability rather than advanced digital integration. As such, expect minimal in terms of built-in tech, entertainment, or driver-assistance systems as understood today.
Technology & Entertainment: Entertainment systems were rudimentary. A basic AM/FM radio, possibly with a cassette player, was the extent of it. Digital displays were rare; analog gauges for engine RPM, speed, fuel level, oil pressure, and temperature were standard. The focus was on providing essential operational information to the driver.
Driver-Assistance Features: Advanced driver-assistance systems (ADAS) like lane keeping assist, adaptive cruise control, or automatic emergency braking were non-existent. Driver support systems were limited to features like power steering and air brakes, which were essential for controlling such a large vehicle.
Safety Features: Safety in the RD685S relied on robust construction and active safety measures. Standard safety features included heavy-duty seatbelts, a strong steel cab designed to withstand impacts, and, of course, the powerful air brake system for reliable stopping power. Optional safety features might have included enhanced lighting packages for visibility or specialized mirrors. Due to its classification, the RD685S was not subjected to passenger vehicle crash-test ratings by organizations like the NHTSA or IIHS. Its safety was evaluated based on industry standards for commercial vehicles, focusing on structural integrity and braking performance under heavy loads.
Technology & Entertainment: Entertainment systems were rudimentary. A basic AM/FM radio, possibly with a cassette player, was the extent of it. Digital displays were rare; analog gauges for engine RPM, speed, fuel level, oil pressure, and temperature were standard. The focus was on providing essential operational information to the driver.
Driver-Assistance Features: Advanced driver-assistance systems (ADAS) like lane keeping assist, adaptive cruise control, or automatic emergency braking were non-existent. Driver support systems were limited to features like power steering and air brakes, which were essential for controlling such a large vehicle.
Safety Features: Safety in the RD685S relied on robust construction and active safety measures. Standard safety features included heavy-duty seatbelts, a strong steel cab designed to withstand impacts, and, of course, the powerful air brake system for reliable stopping power. Optional safety features might have included enhanced lighting packages for visibility or specialized mirrors. Due to its classification, the RD685S was not subjected to passenger vehicle crash-test ratings by organizations like the NHTSA or IIHS. Its safety was evaluated based on industry standards for commercial vehicles, focusing on structural integrity and braking performance under heavy loads.
What Colors Options are Available?
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In the meantime, feel free to explore the other sections for more content.
In the meantime, feel free to explore the other sections for more content.
1988 Mack RD685S Prices and Market Value
The original price of a 1988 Mack RD685S would have varied significantly based on its configuration, engine, and specific vocational outfitting, but a new chassis could have ranged from $60,000 to over $100,000 USD in the late 1980s. Currently, the used market price for a 1988 Mack RD685S is highly variable, influenced by its condition, mileage, maintenance history, and any specialized equipment it may have. Well-maintained examples in good working order can fetch anywhere from $10,000 to $30,000+, while heavily used or project trucks might be available for less. These trucks exhibit a unique depreciation curve; after significant initial depreciation, well-maintained units hold their value surprisingly well due to their durability and reputation, especially among enthusiasts or businesses seeking reliable workhorses.
1988 Mack RD685S Cost of Ownership
Owning a 1988 Mack RD685S can be costly but rewarding. Insurance premiums for commercial vehicles are typically higher than passenger cars, varying with usage and coverage. Fuel costs are substantial, given the powerful diesel engines and their inherent thirst, especially under load. Maintenance and repair costs can be significant; while parts are generally available, specialized mechanics might be required. However, the longevity of the RD685S can offset these costs over the long term. It's not an economical vehicle in terms of fuel or initial purchase price compared to lighter duty vehicles, but its value lies in its durability and work capability.
1988 Mack RD685S Fuel Efficiency
Fuel Type
Diesel
Fuel Capacity
-
City Mileage
-
Highway Mileage
-
1988 Mack RD685S Warranty
Basic
Original warranty
0 months / No data
Estimated remaining
Expired
Powertrain
Original warranty
0 months / No data
Estimated remaining
Expired
Rust
Original warranty
0 months / No data
Estimated remaining
Expired
1988 Mack RD685S Insurance
Insurance for a 1988 Mack RD685S is moderately priced, reflecting its status as a Truck with strong safety ratings and
reasonable repair costs.
reasonable repair costs.
How Does the 1988 Mack RD685S Compare to Other Truck?
The 1988 Mack RD685S competed in the heavy-duty vocational and conventional truck market against formidable rivals. Key competitors included trucks from Peterbilt, Kenworth, Freightliner, and International.
Performance: In terms of raw power and torque, the RD685S, with its Mack E7 engines or comparable Cummins/Detroit Diesels, was competitive. Its performance was geared towards heavy hauling and vocational tasks, offering stout pulling power. Competitors like Peterbilt 379 or Kenworth W900 often offered similar engine options and chassis robustness. Freightliner and International also provided strong alternatives in this segment.
Features: Feature sets across these trucks in 1988 were generally basic and function-oriented. The RD685S excelled in its rugged, no-frills build. Comfort and creature comforts were secondary to durability. Competitors also focused on operator-focused cabins, with analog gauges and manual controls being standard. Some higher-end trims or options might have offered slightly more creature comforts, but the core functionality was similar.
Reliability: Mack trucks, including the RD685S, were renowned for their durability and tough construction, often perceived as having an edge in robustness. Peterbilt and Kenworth also enjoyed strong reputations for reliability and build quality. Freightliner and International offered a broader range of models, with reliability varying by specific series, but generally held good standing in the commercial sector.
Price: Pricing was generally in a similar range for comparable configurations across these brands. The premium brands like Mack, Peterbilt, and Kenworth often commanded slightly higher prices due to their perceived quality and brand prestige.
Alternatives: Similar alternatives that offer comparable ruggedness and durability include the Peterbilt 379 or Kenworth W900 of the same era, known for their iconic styling and robust construction. For a more utilitarian approach, the Freightliner FLD120 or International 9370 could also be considered. These trucks offer similar capabilities and a comparable ownership experience for demanding work.
Performance: In terms of raw power and torque, the RD685S, with its Mack E7 engines or comparable Cummins/Detroit Diesels, was competitive. Its performance was geared towards heavy hauling and vocational tasks, offering stout pulling power. Competitors like Peterbilt 379 or Kenworth W900 often offered similar engine options and chassis robustness. Freightliner and International also provided strong alternatives in this segment.
Features: Feature sets across these trucks in 1988 were generally basic and function-oriented. The RD685S excelled in its rugged, no-frills build. Comfort and creature comforts were secondary to durability. Competitors also focused on operator-focused cabins, with analog gauges and manual controls being standard. Some higher-end trims or options might have offered slightly more creature comforts, but the core functionality was similar.
Reliability: Mack trucks, including the RD685S, were renowned for their durability and tough construction, often perceived as having an edge in robustness. Peterbilt and Kenworth also enjoyed strong reputations for reliability and build quality. Freightliner and International offered a broader range of models, with reliability varying by specific series, but generally held good standing in the commercial sector.
Price: Pricing was generally in a similar range for comparable configurations across these brands. The premium brands like Mack, Peterbilt, and Kenworth often commanded slightly higher prices due to their perceived quality and brand prestige.
Alternatives: Similar alternatives that offer comparable ruggedness and durability include the Peterbilt 379 or Kenworth W900 of the same era, known for their iconic styling and robust construction. For a more utilitarian approach, the Freightliner FLD120 or International 9370 could also be considered. These trucks offer similar capabilities and a comparable ownership experience for demanding work.
Final Verdict: Is the 1988 Mack RD685S a Good Truck?
The 1988 Mack RD685S is ideal for individuals or businesses requiring a dependable, heavy-duty workhorse for vocational applications, towing, or specialized hauling. It's perfect for those who prioritize mechanical simplicity, robust construction, and long-term durability over modern amenities. Whether it's worth buying hinges entirely on condition; a well-maintained RD685S with a solid maintenance history is an excellent value for its capabilities. Purchasing one as a project truck with the intention of restoration or heavy refurbishment is also a viable option for enthusiasts. Given its age, buying used is the only option, and a thorough inspection by a qualified heavy-duty mechanic is essential to identify potential rust or drivetrain issues before committing.
Cathleen V
Cathleen is an exceptional freelance writer covering hot topics in the automotive world from a gearhead's perspective. Her articles delve into various aspects of automotive technology and history, offering readers detailed insights into engine performance, reliability, and maintenance. Through her engaging and informative writing, Cathleen provides valuable information to automotive enthusiasts and consumers alike, helping them make informed decisions about vehicle maintenance and purchases.