Steering Gear Guide for 1979-1987 GMC K2500 Trucks
Tired of loose steering or constant leaks? Here's what you need to know before replacing your K2500's steering gear.
- Before ordering, inspect your frame for cracks where the steering gear mounts; this is a common failure point on these trucks.
- Verify if your truck has standard (pre-1980) or metric (post-1980) power steering hose fittings to ensure you get the correct part.
- A failing steering gear is a major safety concern; symptoms like excessive play or fluid leaks should be addressed immediately.
- While a DIY replacement is possible for experienced mechanics, it requires special tools like a pitman arm puller.
Is Your K2500's Steering Getting Sloppy?
If you're dealing with a steering wheel that has too much play, a constant need to correct your path on the highway, or puddles of power steering fluid on your driveway, your steering gear is likely the culprit. These symptoms are common on the 1979-1987 GMC K2500 as these parts wear out over decades of use. A worn steering gear isn't just annoying; it's a significant safety issue that needs to be addressed.
Frame Cracks are a Known Issue
Before replacing your steering gear, inspect the truck's frame where the gear mounts. It is a well-known issue on these "Square Body" trucks for the frame to develop cracks in this high-stress area. Welding in a reinforcement plate is a common and highly recommended repair, especially if you plan on running larger tires.
Common Failure Symptoms
A failing steering gear gives several warning signs. Recognizing them early can prevent a more serious failure down the road.
- Excessive Steering Play: This is the most common complaint. It feels like a "dead spot" when you turn the wheel before the truck starts to respond.
- Fluid Leaks: Leaks are a clear sign of failing seals inside the gearbox. A major leak can drain all your fluid in a short distance.
- Wandering on the Road: You constantly have to make small corrections to the steering wheel to keep the truck driving in a straight line.
- Grinding or Popping Noises: Unusual noises when turning can indicate worn internal gears or bearings.
- Loss of Power Assist: If turning the wheel becomes very difficult, especially at low speeds, the internal valves of the gearbox may be failing.
Choosing the Right Aftermarket Steering Gear
When it comes to replacing the steering gear on your K2500, you have several options. Since new OEM parts are generally unavailable for a vehicle this age, the choice is between remanufactured and new aftermarket units.
Remanufactured vs. New Aftermarket:
- Remanufactured: These are original (OEM) cores that have been disassembled, cleaned, and rebuilt with new seals, bearings, and other wear items. Quality can vary significantly between rebuilders. Premium remanufacturers like RedHead or Blue Top are highly regarded by truck owners for their quality control and upgrades 🎬 Take a tour of the Red Head Steering Gears facility. over the original design. 🎬 See a review of the Blue Top steering gear after installation. Standard remanufactured units from brands like BBB Industries offer a balance of cost and reliability, often meeting or exceeding original specs.
- New Aftermarket: These are brand-new units built from scratch. Brands like PWR offer new components that eliminate the uncertainty of a used core. This can be a good option if a quality remanufactured unit isn't available.
Check Your Fittings!
Around 1980, GM switched the power steering line fittings from standard (SAE inverted flare) to metric (O-ring). When ordering your new steering gear, make sure you know which type of lines your truck has to avoid installation headaches. Some replacement boxes may require adapter fittings.
Cost of Replacing a Steering Gear on a 1979-1987 GMC K2500
The total cost will depend on the part you choose and whether you do the work yourself or hire a professional.
| Part/Service | Estimated Cost |
|---|---|
| New Aftermarket Steering Gear | $209.55 - $865.91 |
| Remanufactured Steering Gear | $150 - $500+ (plus core charge) |
| Shop Labor | $250 - $500 |
| Total Estimated Cost | $360 - $1365+ |
Frequently Asked Questions
Is replacing the steering gear a DIY job?
For an experienced DIY mechanic, yes. The job requires heavy-duty tools, including a pitman arm puller, and can be physically demanding. You will also need to bleed the power steering system properly after installation. If you are not comfortable with these tasks, it's best to leave it to a professional.
🎬 Watch this step-by-step DIY steering box replacement guide.What is a core charge?
When you buy a remanufactured part, you'll often pay a "core charge." This is a deposit that is refunded to you when you return your old, rebuildable steering gear.
Should I get a "quick ratio" steering box?
Some aftermarket and remanufactured steering gears are offered in a "quick ratio" configuration. This means it takes fewer turns of the steering wheel to go from lock-to-lock, which can make the truck feel more responsive. This is a popular upgrade for many owners.
Were there any recalls on the steering gear for this truck?
Searches of the NHTSA database did not show any steering gear-specific recalls for the 1979-1987 GMC K2500 model years. Any recalls found are for much newer models and do not apply to these trucks.
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Technical Specifications
The 1979-1987 GMC K2500 uses a three-bolt, inside-the-frame mounted recirculating ball power steering gear. The input shaft is a GM DD style and the output shaft requires a four-slot pitman arm. Hose fittings changed from SAE inverted flare to metric O-ring around the 1980 model year.
We Have This Part in Stock
The information in this article is provided for general reference and educational purposes only. Vehicle specifications, procedures, and part compatibility can vary by production date, trim level, and region. Always consult your vehicle's factory service manual and verify part numbers before purchasing or performing repairs. Safety-critical components such as airbags, seat belts, and braking systems should be installed by a qualified professional.