Jeep Jeep Comanche (Mj)

```html

Jeep Comanche (MJ): A Comprehensive Guide

The Jeep Comanche (MJ) is a compact pickup truck manufactured by Jeep from 1985 to 1992. Based on the Cherokee (XJ) platform, it offered Jeep's renowned off-road capability with the added utility of a truck bed. Although production lasted only eight years, the Comanche developed a loyal following due to its ruggedness, simplicity, and unique combination of truck and Jeep attributes. It occupies a niche between compact trucks and full-size pickups, appealing to those needing more utility than an SUV but not requiring the size of a larger truck.

Generations

First Generation (1985-1992)

• Overview: All Comanches belong to a single generation. However, there were running changes and variations throughout its production run. Key features include a unibody construction for the cab and front section, a separate ladder frame for the bed, and leaf spring rear suspension. All Comanches featured the Selec-Trac or Command-Trac four-wheel-drive systems.
• 1985-1986: Early models featured a carbureted 2.5L AMC inline-four engine or an optional 2.8L General Motors V6 engine. These years are less desirable due to the engines' lower power and potential reliability issues. The rear Dana 35 axle was also common, a weaker point compared to later options.
• 1987-1990: The 2.8L GM V6 was replaced by a fuel-injected 4.0L AMC inline-six engine, significantly improving power and reliability. This is generally considered the sweet spot for Comanche production. The AX-15 manual transmission also debuted, a robust and reliable gearbox. The short bed versions gained popularity.
• 1991-1992: Minor cosmetic changes were made, and the 4.0L engine received some updates. These later models are sought after for their improved fuel injection and reliability features and are considered the most refined of the series.
• Trim Levels: Various trim levels were offered throughout the production run, including base, X, Pioneer, Chief, Laredo, and Eliminator. The Eliminator package is highly sought-after due to its sportier appearance and often included features like bucket seats and a center console.

Reliability & Common Issues

The Jeep Comanche, while generally reliable for its age, has certain common issues that potential buyers should be aware of:

• Rust: Rust is a major concern, especially in areas with road salt. Pay close attention to the floorboards, rocker panels, bed edges, and around the windshield. The Comanche's unibody construction makes rust repair more complex.
• 4.0L Engine Issues: While the 4.0L is robust, it can suffer from oil leaks (valve cover, rear main seal) and cracked exhaust manifolds. Keep an eye out for "ticking" noises, especially when cold, which can indicate exhaust manifold issues. The Renix era (87-90) ECUs can sometimes have sensor issues that are difficult to diagnose, and parts availability is declining.
• Cooling System: The cooling system, particularly the radiator and water pump, can be prone to failure, especially on higher-mileage vehicles. Overheating can lead to head gasket issues, so regular maintenance is crucial.
• Transmission Issues: The AX-15 manual transmission is generally reliable, but worn synchronizers can lead to grinding during shifts. The automatic transmissions (Aisin-Warner AW4) are also generally reliable but can suffer from slipping or delayed shifts with age and lack of maintenance. Check fluid levels and condition.
• Dana 35 Axle: The Dana 35 rear axle, found on earlier and some lower-spec models, is weaker than the Dana 44. It can be prone to breakage, especially with larger tires or heavy off-roading. The Dana 44 is a more desirable upgrade.
• Electrical Issues: Like many vehicles of this era, the Comanche can suffer from electrical gremlins due to corroded connectors, aging wiring, and faulty sensors. Check all lights, gauges, and accessories for proper operation.
• Suspension: The leaf spring rear suspension can sag with age, affecting ride quality and load-carrying capacity. Worn bushings and shocks can also contribute to a rough ride.
• Brakes: The braking system should be thoroughly inspected for worn pads, rotors, and leaky brake lines. The rear drum brakes can be prone to corrosion and require adjustment.

Driving Experience

The Jeep Comanche offers a unique driving experience that blends the ruggedness of a Jeep with the practicality of a truck.

• Pros:
  • Off-Road Capability: The Comanche retains the Jeep's legendary off-road prowess, making it capable in a variety of terrain.
  • Simple and Durable: The Comanche is a relatively simple vehicle, making it easier to maintain and repair.
  • Compact Size: Its compact dimensions make it more maneuverable than full-size trucks, both on and off-road.
  • Unique Style: The Comanche has a distinctive and appealing appearance that sets it apart from other trucks.
  • Parts Availability: Many parts are still readily available due to its shared components with the Cherokee XJ.
• Cons:
  • Ride Quality: The leaf spring rear suspension can provide a firm ride, especially when unloaded.
  • Fuel Economy: Fuel economy is typical of vehicles from this era, not very good by modern standards. Expect 15-20 MPG with the 4.0L engine.
  • Limited Interior Space: The cab is relatively small, which can be a drawback for taller drivers or those carrying passengers.
  • Age-Related Issues: Due to its age, the Comanche is prone to rust, wear, and tear.
  • Finding a Well-Maintained Example: Finding a Comanche that has been well-maintained and not heavily modified can be challenging.

Buying Advice

When buying a Jeep Comanche, consider the following:

• Best Years: 1987-1992 models are generally preferred due to the reliable 4.0L engine and the availability of the AX-15 manual transmission. 1991 and 1992 models are the most refined.
• Years to Avoid: Earlier models (1985-1986) with the 2.5L or 2.8L engines are generally less desirable.
• Check for Rust: Thoroughly inspect the vehicle for rust, especially in common problem areas. A pre-purchase inspection by a qualified mechanic is highly recommended.
• Engine Condition: Listen for any unusual noises, such as ticking or knocking, and check for oil leaks. A compression test can provide valuable information about the engine's health.
• Transmission Function: Test the transmission thoroughly, checking for smooth shifts and any signs of slippage or grinding.
• Axle Type: If you plan on off-roading or towing, look for a model with the Dana 44 rear axle.
• Modifications: Be wary of heavily modified vehicles, as they may have been subjected to excessive stress or poorly executed modifications.
• Paperwork: Ask for maintenance records to get an idea of the vehicle's history and how well it has been cared for.
• Price: Prices for Comanches can vary widely depending on condition, location, and features. Research comparable vehicles to get an idea of fair market value. Expect to pay a premium for well-preserved, low-mileage examples, especially Eliminator trim packages.

```