1989-1991 Ford Ranger Cab Shell: Rust, Compatibility, and Replacement Guide

Symptoms of a Failing Ford Ranger Cab

Unlike a mechanical part, a cab doesn't 'fail' suddenly. Instead, it degrades over time. The primary enemy of the 1989-1991 Ford Ranger cab is rust, which can compromise its structure and safety. Here are the main symptoms to watch for:

• Visible Rust and Rot: This is the most obvious sign. Check the floor pans (especially under the carpet or vinyl flooring), cab corners, rocker panels (the area below the doors), and around the windshield and rear window seals. Paint bubbling is an early warning sign of rust forming underneath.
• Water Leaks: Water staining on the headliner or wet carpets are often caused by rusted-out window seams or cowl vents. This moisture accelerates floor pan rust.
• Spongy or Soft Floor: If the floor feels soft or gives way under your feet, it's a sign of severe rust perforation. In extreme cases, components like the clutch and brake booster have been known to push through a rusted firewall.
• Door Misalignment: If doors are difficult to close or show uneven gaps, it can indicate that the cab has sagged due to rusted or failed cab mounts.
• Creaks, Groans, and Clunks: Unusual noises when driving over bumps can be caused by the cab flexing due to structural weakness or worn-out cab mount bushings that allow metal-to-metal contact.

Buying a Used 1989-1991 Ranger Cab: What to Inspect

Buying a used cab is a major purchase. A thorough inspection is crucial to avoid buying another rusty part or one that won't fit. Cabs from this era are prone to significant rust, and finding a clean one can be a challenge.

Key Compatibility Checks

Before inspecting for condition, verify compatibility. The initial data provided is correct and critical: not all 1989-1992 Ranger cabs are the same.

• Cab Size: This guide focuses on the Regular Cab. A SuperCab (extended cab) shell has different dimensions and mounting points and is not interchangeable.
• Shifter Location: This is the most common mistake buyers make. Cabs are different for column-shifted automatics versus floor-shifted manual or automatic transmissions. The floor pan and transmission tunnel are shaped differently. Using the wrong one requires significant metal fabrication to the floor.

Physical Inspection Checklist

Bring a small hammer, a screwdriver, and a magnet to your inspection.

1. Floor Pans: Pull back the carpet or vinyl flooring. Pay special attention to the driver's side footwell, the area under the seat, and along the transmission tunnel. Tap questionable areas with a hammer; a solid 'thud' is good, a 'crunch' or the hammer going through is bad.
2. Cab Mounts: There are six cab mounts connecting the cab to the frame. Inspect the metal on the cab itself where the mounts attach. Look for cracks and rust perforation. A failed mount can cause the cab to sag and is a serious safety issue.
3. Firewall: Check the entire firewall for rust and cracks, especially around where the steering column, brake booster, and clutch master cylinder pass through. Severe rust here is extremely dangerous.
4. Cab Corners & Rocker Panels: These are notorious rust spots. Check them from the outside and, if possible, look inside from under the truck. Use a magnet to check for thick body filler, which indicates a previous, possibly poor, repair.
5. Cowl and Windshield Frame: Look for rust in the channel where the windshield sits and in the cowl vent area below it. Leaks here are common and soak the floor pans from above.
6. Roof and Drip Rails: Check the seams along the roof and above the doors for rust, which can be hidden by trim.

Known Issues, TSBs, and Recalls

For a vehicle of this age, most recalls relate to components rather than the cab structure itself. However, some are relevant to a cab swap project.

• NHTSA Campaign #91V189000: Affects some 1990-1991 models. An issue where the automatic transmission may not fully engage in 'Park', potentially leading to a rollaway. This is relevant if you are swapping transmission components along with the cab.
• NHTSA Campaign #90V044000 & #89V234000: On some 1990 models with the 4.0L V6, the throttle could stick open, causing unintended acceleration.
• Common Rust: While not a recall, widespread rust is the single biggest issue with these cabs. Forum discussions are filled with owners dealing with rusted floors, cab mounts, and firewalls. The body-on-frame design means the cab's body panels can rust significantly while the frame remains solid, but severe cab rust is still a safety concern.

Cost of a Replacement Ford Ranger Cab (1989-1991)

Replacing a cab is a labor-intensive job, and the cost of the part is only one piece of the puzzle.

Installation Difficulty and Procedure Overview

• Difficulty Rating: 5 out of 5 (Expert)
• DIY Feasible: No. This is not a driveway project for a typical DIY mechanic. It requires a vehicle lift or engine hoist, extensive tools, and significant expertise in multiple automotive systems.

A cab swap is one of the most complex repairs possible. The general steps include: disconnecting the battery, removing the front bumper and grille, draining coolant and disconnecting radiator hoses, disconnecting the wiring harness between the cab and engine, removing the steering shaft connection, disconnecting brake lines from the master cylinder, removing all interior components (seats, dashboard, carpet), unbolting the cab mounts, and finally, using a lift to carefully separate the cab from the frame.

Frequently Asked Questions (FAQ)