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The short version
- A TrailBlazer wheel bearing is unusually simple to order: 513188 covers the front across the whole 2002 to 2009 run.
- No engine split, no drivetrain split at the front, no build date trap. One number does it.
- The complication is elsewhere. These carry a solid rear axle, so the rear uses pressed bearings rather than bolt on hubs.
- That means the front and rear are completely different jobs on the same vehicle.
Most of the traps on this site are about ordering. This one is about the job itself, because the two ends of the vehicle have nothing in common.
The front TrailBlazer wheel bearing is easy
| Years | Detail | Number |
|---|---|---|
| 2002 to 2009 | Front | 513188 check price |
Every model year this chart resolves: 2002, 2003, 2004, 2005, 2006, 2007, 2008 and 2009.
Price links lead to Amazon searches for that number. As an Amazon Associate this site earns from qualifying purchases.
Four bolts behind the knuckle, an axle nut, and the unit comes out. No press, no special tooling beyond a good breaker bar.
Cross referencing is on the cross reference page.
The rear is a different vehicle
The rear runs a live axle, so the bearing rides in the axle tube and the shaft has to come out to reach it.
That is a longer job, it involves the differential, and it is not comparable to the front at all.
Solid axle work is covered on the rear replacement page.
What actually fails
The front hub carries the wheel speed sensor, and on this generation of GM trucks the sensor failing inside the hub is at least as common as the bearing wearing out.
The result is an ABS light and sometimes a traction control fault, with no noise at all.
That is on the ABS light page and the sensor page.
What it weighs
This is a body on frame truck, and weight is what wears hubs. It is heavier than the crossovers it competed with, and the front hubs carry that difference every mile.
Towing adds to it. A hitch weight sits behind the rear axle and levers load onto the front, which is not obvious but is real.
Those are on the towing page and the Chevrolet page.
Diagnosing a TrailBlazer wheel bearing
- Check for an ABS light first, since the sensor lives inside the front hub.
- Coast in neutral at the noise speed.
- Weave at road speed and note the loaded side.
- Rock the front wheel at twelve and six.
- Listen at the rear separately, since it is a different design entirely.
Those are on the checking page.
Common questions
Which TrailBlazer wheel bearing do I need at the front?
513188 is cited across the whole 2002 to 2009 run. Confirm against your own part.
Why is the rear so different?
It uses a solid axle with pressed bearings rather than bolt on hub units.
My ABS light is on but there is no noise.
That points at the speed sensor inside the front hub, which fails independently of the bearing.
Do I need a press for the front?
No. The front is four bolts and an axle nut.
Does towing wear them faster?
Yes. Hitch weight levers extra load onto the front axle.
Can I replace just the sensor?
Not on the front. It is built into the hub unit.
Should I do both fronts?
Only if both are worn, though on a high mileage truck the second often follows soon.