Dodge D400 Wheel Bearing and Race Replacement Guide (1978-1981)
Keep your heavy-duty Dodge rolling safely by understanding when and how to replace your wheel bearings.
- The 1978-1981 D400 uses tapered roller bearings that must be manually packed with grease before installation.
- For a heavy-duty truck, premium brands like Timken, SKF, or FAG are strongly recommended for safety and durability.
- A bad wheel bearing is a critical safety issue; do not drive on a bearing that is noisy or loose, as wheel separation can occur.
- Always replace the bearing and its matching race as a set.
Is Your D400 Making Strange Noises? Signs of a Bad Wheel Bearing
A worn-out wheel bearing on a heavy truck like the D400 is a major safety hazard that can lead to a wheel separating from the vehicle. Do not ignore the warning signs. If you hear or feel any of the following, it's time to inspect your bearings immediately.
- Grinding or Humming Noise: This is the most common symptom. You'll hear a rumbling, grinding, or humming sound from the front wheel area that gets louder with speed. The pitch might change when you turn.
- Loose or Wandering Steering: A bad bearing can cause vibrations in the steering wheel. The truck might feel loose, pull to one side, or seem less responsive.
- Wheel Wobble: To check for this, safely jack up the front of the truck. Grab the tire at the top and bottom (12 and 6 o'clock) and try to shake it. If you feel any significant play or clunking, the bearing is bad.
Safety First: A Critical Part
Driving with a bad wheel bearing is not recommended. A complete failure can cause the wheel to seize or detach, leading to a total loss of control. If you suspect a problem, inspect it immediately.
Choosing the Right Aftermarket Wheel Bearing
Original OEM parts for a vintage truck like the D400 are generally not available. Fortunately, the aftermarket provides excellent options. For a heavy-duty workhorse, investing in a quality bearing is essential for safety and longevity. Inferior parts can fail quickly under the stress of heavy loads.
Aftermarket Brand Tiers
| Tier | Brands | Quality & Use Case |
|---|---|---|
| Premium Quality | Timken, SKF, FAG | Widely considered the best choices for durability and reliability in heavy-duty applications. These brands use high-quality steel and precision manufacturing, making them trusted for trucks and demanding jobs. |
| Standard Quality | National Bearing | A well-regarded brand offering a good balance of quality and performance. National is a solid choice for daily driving and moderate workloads, providing a reliable repair without the premium price tag. |
| Economy | WJB | A budget-friendly option to get a truck back on the road. While functional, economy bearings may not offer the same long-term durability as premium brands, especially under frequent heavy hauling. |
Pro Tip: Invest in Quality for Heavy Work
For a truck like the D400 that's built to work, spending a little extra on a premium brand like Timken or SKF is highly recommended. The added cost is small compared to the peace of mind and longer service life you'll get, especially if you use your truck for hauling or towing.
Frequently Asked Questions (FAQ)
Do I need to grease the new bearings?
Yes, absolutely. Unlike modern sealed hubs, the tapered roller bearings for your D400 must be manually packed with high-temperature wheel bearing grease before installation. You must force grease between the rollers until it is fully saturated. Failure to grease the bearings properly will cause them to fail very quickly.
Should I replace bearings on both sides at the same time?
It is highly recommended. If one wheel bearing has failed from age and use, the other side is likely not far behind. Replacing them in pairs ensures balanced handling and prevents you from having to do the same job again soon.
Do I have to replace the bearing race?
Yes. The bearing and race are a matched set. Always replace the race (the metal ring inside the hub) when you replace the bearing. The old race must be driven out of the hub and the new one pressed in straight.
Are there any recalls for my D400's wheel bearings?
No. Searches of the National Highway Traffic Safety Administration (NHTSA) database show no specific recalls or technical service bulletins (TSBs) for wheel bearings on the 1978-1981 Dodge D400. Any issues you encounter are typically due to normal wear and tear over the vehicle's long life.
Technical Specifications
This vehicle uses a serviceable, non-sealed tapered roller bearing and race set for the front wheels. Axle ratings (e.g., 3,800 lb, 4,500 lb, 5,000 lb) may affect which specific bearing is required, so verifying fitment is essential.
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.