ISUZU NKR NPR Center Bearing Assembly 5-37510008-0 32mm OEM Fit

The Center Bearing Support Assembly with OEM numbers 5-37510008-0 and 5375100080 is a verified direct-fit replacement for ISUZU NKR / NPR / 100P / 600P / ELF series light trucks equipped with 4JB1 / 4JG2 / 4HE1 diesel engines. This assembly is the core support element of the propeller shaft system, mounted on the chassis frame or cab floor. It supports the intermediate section of a long propeller shaft, absorbs rotation-induced vibration and angular variation, and prevents shaft bending, resonance, or premature fatigue failure caused by excessive span.

The center bearing support assembly consists of a bearing body, a rubber cushion, and a metal bracket. The bearing inner race is pressed onto the propeller shaft journal, the outer race is secured in the rubber cushion, and the cushion is bolted to the frame via the metal bracket. When the shaft rotates at high speed, the bearing carries radial loads and allows free rotation; the rubber cushion isolates vibration and noise transmitted to the frame while compensating for minor angular misalignment caused by suspension movement. The 32 mm inner diameter is specific to ISUZU light truck shaft journals with 4JB1 / 4JG2 / 4HE1 configurations. Once the bearing wears or the rubber cushion degrades, the shaft loses its intermediate support, causing severe vibration and noise, and potentially shaft fracture.

Replace the center bearing support assembly when any of these symptoms appear:

• Low-frequency "hum" or "rumble" vibration/noise from the mid-chassis while driving — worn bearing races or degraded grease; the most typical center bearing fault signal.
• Metallic knock or "clunk" from the propeller shaft area during launch, acceleration, or gear shifts — excessive bearing clearance or torn rubber cushion, causing impact at the support point.
• Vibration intensifies with vehicle speed, with resonance at specific speeds — seized bearing or rubber cushion losing elasticity, unable to dampen shaft vibration.
• Visible propeller shaft runout or whipping — severely worn bearing or loose bracket; the shaft loses centered support.
• Visible cracks, tears, or separation of the rubber cushion from the metal bracket — structural failure of the cushioning element requiring immediate replacement.
• Binding, grinding, or excessive axial play when rotating the bearing — internal bearing damage with seizure risk.

1. 1Preparation: Raise and support the vehicle. Mark the alignment of the propeller shaft and differential flange. Remove the propeller shaft.
2. 2Removal: Remove the center bearing bracket-to-frame bolts. Extract the old bearing from the shaft using a dedicated puller or press. Clean the shaft journal.
3. 3Inspection: Inspect the shaft journal for wear, scoring, or out-of-round. Check the universal joints for looseness or binding. Verify the new bearing's inner diameter fits the journal.
4. 4Installation: Press the new bearing onto the shaft journal using a dedicated press tool until fully seated. Never hammer. Install the bracket onto the frame and torque the bolts to specification (do not over-tighten the rubber cushion bolts).
5. 5Propeller Shaft Reinstallation: Reinstall the shaft according to the alignment marks, connecting the universal joints and flanges. Torque the bolts to specification.
6. 6Final Check: Check propeller shaft alignment and universal joint phasing. Rotate the shaft by hand to confirm no binding or abnormal clearance.
7. 7Road Test: Perform a road test to confirm no abnormal vibration or noise from the mid-chassis across all speed ranges.

• Every 10,000 km: Check the center support area for abnormal noise or vibration; inspect the rubber cushion for cracks.
• Every 40,000–50,000 km: Check bearing rotation smoothness and play; check bracket bolt tightness.
• When mid-chassis noise, vibration, or shaft runout is detected: Inspect the center bearing support assembly immediately.
• When replacing the propeller shaft or universal joints: The center bearing should also be inspected.

• Standard Packaging: Anti-rust oil + VCI film + neutral carton.
• Custom Packaging: Neutral box, color box, or customer-branded packaging.
• Suitable For: Drivetrain repair shops, ISUZU parts distributors, fleet maintenance centers.
• Supply Capacity: Stable batch supply with batch-level quality reports available.
• MOQ: Small quantities accepted (quantity discounts available).