AI-generated · grounded in NHTSA data
Reliability & 5-year cost of ownership — 1999 Peterbilt 379
Overall rating NHTSA-grounded
Average
Estimated 5-year repair + maintenance cost: $8,000–$12,000
The 1999 Peterbilt 379 shows an average reliability profile. Significant issues include tie rod assembly complications and a known problem with front hub unit bearings, impacting steering and suspension. Though complaints are fewer, these key areas suggest moderate attention and care may be needed.
Most-common failures
| Part | Typical mileage | Cost range | Frequency |
|---|---|---|---|
| Tie rod assembly | 60,000–100,000 miles | $700–$1,500 | common |
| Front hub unit bearings | 80,000–120,000 miles | $500–$1,000 | occasional |
| Ignition module | 70,000–110,000 miles | $300–$700 | rare |
Scheduled maintenance to budget
Routine items every owner should plan for.
- Oil and filter change every 10,000 miles
- Brake inspection bi-annually
- Transmission fluid replacement every 60,000 miles
- Coolant system flush every 50,000 miles
- Air filter replacement annually
Warning signs to watch for
Symptoms that signal a major upcoming repair.
- Steering vibrations or looseness
- Unusual noises from front hubs
- Irregular idling or stalling
Generated by gpt-4o on 6/9/2026. Cost ranges are conservative estimates that account for typical regional variation.