Sub Spring Rubber Auxiliary Bumper for Isuzu NPR with Shore A 65-75 Hardness High-grade Natural Rubber Direct OEM Replacement

The Sub Spring Rubber (OEM Numbers: 8-97254387-0 / 8972543870) is a premium-quality, direct replacement suspension component designed for Isuzu NPR series medium-duty trucks. This component functions as an auxiliary spring bumper that absorbs impact during full suspension compression, preventing metal-to-metal contact between the axle and chassis frame while providing progressive overload protection.

• OE Quality: Manufactured to Isuzu dimensional and material specifications for perfect fit and reliable overload protection
• Progressive Cushioning: Absorbs impact progressively as suspension compresses, preventing harsh bottoming out
• Heavy-Duty Rubber Compound: Resists permanent compression set, tearing, and aging under heavy loads
• Weather Resistant: Formulated to withstand UV, ozone, road salts, and temperature extremes
• Protects Suspension Components: Prevents metal-to-metal contact, reducing fatigue on main springs, frame, and axle
• Restores Ride Quality: Eliminates harsh clunks and improves comfort when carrying heavy loads
• Direct Replacement: Matches OE mounting hole pattern and height - simple bolt-on installation
• Cost-Effective: Affordable alternative to genuine OEM without compromising durability

This sub spring rubber is specifically designed for Isuzu NPR trucks with rear leaf spring suspension.

• ISUZU NPR (NPR59, NPR66, NPR70, NPR71, NPR75, etc.)
• May also fit other Isuzu medium trucks with similar rear suspension - verify

• 4HE1 (4.8L / 5.2L diesel)
• 4HF1 (3.9L diesel)
• 4HG1 (4.3L diesel)
• 4HK1 (5.2L diesel)

Installation Steps:

1. Safely lift and support the rear of the vehicle - raise the rear and support the frame on jack stands. The rear axle should hang freely.
2. Locate the sub spring rubber - usually mounted on the chassis frame above the rear axle or on the spring plate.
3. Remove the old rubber - if bolt-on, remove the mounting bolt/nut. If press-fit, pry out with a screwdriver.
4. Clean the mounting surface - remove rust and debris.
5. Inspect the mounting bracket - check for cracks or damage.
6. Install the new rubber - position onto mounting stud or bolt hole. If bolt-on, insert bolt and tighten to specification (typically 30-50 Nm). Do not overtighten (rubber may deform).
7. Repeat for the other side - replace both left and right bumpers simultaneously for balanced performance.
8. Lower the vehicle - test drive over bumps to ensure no abnormal noise.

• Material Verification: Rubber compound tested for hardness (Shore A), tensile strength, and elongation per ASTM D2000
• Dimensional Inspection: Overall height, outer diameter, mounting hole diameter/thread, and shape verified against OE blueprints
• Compression Set Test: Sample compressed to 50% of original height at 70°C for 22 hours; permanent deformation measured
• Tear Resistance Test: ASTM D624 die C tear strength verified
• Aging Test: Accelerated heat aging (70°C for 70 hours) to confirm retained properties
• Visual Inspection: 100% checked for voids, cracks, flash, or surface defects
• Packaged Safely: Rubber bumper wrapped in plastic, boxed individually or in pairs

• Neutral export packing or customized packaging available
• Carton or wooden case for safe transportation
• Fast delivery for stock items
• Shipping by Express Air or Sea