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The ECCPP Front Wheel Hub Bearing (interchange PN WA513124) is the front hub assembly for 1997-2005 Chevy Blazer, S10, GMC Sonoma, and GMC Jimmy 4WD trucks. Fitment also covers the 1997-2001 Oldsmobile Bravada AWD and the 1997-2000 Isuzu Hombre 4WD, which share the GM S-series GMT325/GMT330 chassis. It is a 4WD/AWD part and does not fit 2WD trucks.

The unit combines a pre-loaded, sealed double-row angular-contact bearing with an integrated 48-tooth ABS tone ring matched to GM's wheel-speed sensor architecture. Flange bolts are M12 × 1.75 in a 3-bolt triangular layout, and the 2.76-inch (70.1 mm) wheel pilot matches GM OEM 13542340 and 13546940.

Production runs under ISO/TS 16949 quality management and is validated against SAE J2530 performance benchmarks for the 2026 aftermarket cycle.

Fitment list

• Chevrolet Blazer 4WD, 1997-2005
• Chevrolet S10 4WD, 1997-2005
• GMC Sonoma 4WD, 1997-2005
• GMC Jimmy 4WD, 1997-2005
• Oldsmobile Bravada AWD, 1997-2001
• Isuzu Hombre 4WD, 1997-2000

Replacing both front hubs? The ECCPP 2P two-hub kit covers these same trucks, and the separate 4WD front hub listing for the S10, Blazer, Jimmy, Sonoma, and Isuzu Hombre spans the identical range.

For rotors, lug hardware, and related components, start with the full Wheels, Tires & Parts collection. Working on a 2008-2009 GMC Envoy or Chevy Trailblazer next? Our front strut and sway bar link kit guide covers a complete front suspension refresh for that platform.

ECCPP WA513124 vs. GM OEM

Data from ECCPP manufacturing specifications, GM Service Information Document ID 3360339 (2026 revision), and SAE J2530_202604 aftermarket wheel-bearing requirements.

Materials, cage, and sealing

The hub body is forged 1045 medium-carbon steel with SAE J403 chemistry (0.43-0.50% carbon, 0.60-0.90% manganese), heat treated to Rockwell C 28-32 at the bearing journal and induction hardened to a 0.060-0.090 inch case depth per SAE J406. That hardness resists brinelling under these trucks' 3,800-lb front axle weight rating (GAWR).

The bearing cage swaps stamped steel for glass-fiber-reinforced polyamide (PA66-GF25), cutting rotating mass about 12% versus all-steel equivalents while holding grease better at sustained temperatures above 250°F. That matches CAFE-driven lightweighting targets in the 2026 cycle.

Seal and grease package

Sealing is a triple-lip fluoroelastomer (FKM) system built to ISO 6194-1 and rated per ASTM D2000 M2HK714, with a usable range 40°F wider than the OEM nitrile seal. The unit ships filled with NLGI Grade 2 polyurea synthetic grease effective from -40°F to 350°F.

DTC codes tied to the tone ring

The 48-tooth passive tone ring feeds the GM Electronic Brake Control Module (EBCM) a square-wave signal readable across CAN-bus 2.0B and 3.0 layers. Axial play beyond 0.005 inches or inner-race spalling disturbs the ring-to-sensor air gap, and the signal turns erratic. Expect these codes:

• C0035, Left Front Wheel Speed Sensor Circuit
• C0040, Right Front Wheel Speed Sensor Circuit
• C0245, Wheel Speed Sensor Frequency Error, set when bearing play causes tone-ring dropout beyond 100 ms
• U1041, Lost Communication with EBCM, secondary to persistent C0035/C0040
• P0400-P0499, EGR system codes; a hub bearing cannot set these, so treat any EGR fault separately

The failure chain on 2026 calibrations

The chain runs C0035 or C0040 first, then U1041, then the ABS, Stabilitrak, and Service 4WD lamps together. Updated 2026 GM EBCM flash calibrations (P/N 19244850 and superseding) log freeze-frame data with the sensor's voltage deviation at the moment the code sets, which speeds up diagnosis.

How failure progresses

The GMT325/330 platform degrades in a predictable order. Match your symptoms to a stage:

• Stage 1: humming or growling at 25-45 MPH, loudest on gentle steering sweeps. Noise in a right turn points to the left bearing, and the reverse holds.
• Stage 2: steering wheel vibration at 55-70 MPH, often misread as tire imbalance. It survives a tire rotation.
• Stage 3: ABS activation below 10 MPH during light braking; the erratic signal convinces the EBCM a wheel is locking, and C0035/C0040 turn persistent.
• Stage 4: clicking or popping in parking maneuvers from cage fracture or ball spalling. Replace the hub immediately; continued driving risks spindle damage.

Installation torque values

Per the 2026 revision of GM Service Information (Document ID 3360339), torque the three flange bolts to 77 ft-lbs (105 N·m) in a star/cross pattern with medium-strength threadlocker (Loctite 242 or equivalent) on the first 3-4 threads. The axle nut takes a 36 mm socket and 185 ft-lbs (250 N·m) on 1997-2005 4WD trucks.

Service life, warranty, and cross-references

Under normal on-road duty the assembly is rated for 100,000-130,000 miles. Mixed on/off-road use calls for inspection at 70,000-mile intervals under updated 2026 GM TSB guidance. Koeep SKU: ECCPP-1P-GM-FHUB-4WD.

An estimated 1.2 million GMT325/330 trucks remain on North American roads as of 2026, and the WA513124 is projected for active supply through 2030. Cross-references include:

• GM 13542340
• GM 13546940
• GM 13535653
• Timken HA590392
• SKF BR930244
• MOOG 513124
• Detroit Axle 513124

All subcomponents are IMDS-reported under the EU ELV Directive 2000/53/EC 2026 Amendment and are free of hexavalent chromium, lead, mercury, and cadmium.

Rolling resistance and EV conversions

The SAE J2530_202604 addenda caps parasitic drag at 0.0025 for light-truck hub assemblies. The double-row angular-contact design measures 0.0018-0.0021, well inside the limit.

The hub is sealed and shares no lubricant with the differential or CV joints, so low-viscosity EV gear oils never touch it. On converted S10s turning 3,500+ RPM at the wheel flange, the PA66-GF25 cage (30 to 40 ppm/K thermal expansion against 12 for steel) tightens internal clearances slightly as heat builds, limiting ball skidding when regenerative braking reverses torque at high frequency.

Ordering and fitment help

Frequently asked questions