Restore the designed control and handling of your heavy-duty truck with the KYB Excel-G Suspension Shock Absorber 346603, a nitrogen gas-charged rear shock that installs as a direct-fit replacement on the 2003-2009 Chevrolet C4500 Kodiak and C5500 Kodiak and the 2003-2009 GMC C4500 Topkick and C5500 Topkick (see the Buyer's Guide tab for engine details). Classified OEA (Original Equipment for the Aftermarket), the Excel-G is calibrated to help return the vehicle's original ride control, stability, stopping, lane-change response and handling — not to change it.
- Twin-tube, nitrogen gas-charged design: built with the same OE-quality components KYB supplies to new-vehicle manufacturers.
- Triple-lip fluid seal: reduces the chance of oil and gas leaking out.
- Vehicle-specific damping valves: hand-assembled in-house to manage tire contact, steering response and body movement.
- Supports electronic safety systems: helps keep them performing as designed by maintaining suspension behavior the manufacturer intended.
KYB's strong, thick strut bodies and brackets minimize flex to help maintain correct alignment. Made in USA. This is a rear-position shock; replacing both sides as a matched pair is recommended for balanced ride control.
Interchange: 12100534 · 15185643 · 15185644 · 15782915 · 65172
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
Which vehicles does this KYB 346603 shock fit?
It's a direct-fit replacement for the 2003-2009 Chevrolet C4500 Kodiak and C5500 Kodiak and the 2003-2009 GMC C4500 Topkick and C5500 Topkick. See the Buyer's Guide tab for engine details.
What position is this shock?
This is a rear-position shock absorber. Replacing both rear sides as a matched pair is recommended for balanced, even ride control.
What type of shock is the KYB Excel-G?
It's a nitrogen gas-charged, twin-tube design built with the same OE-quality components KYB supplies to new-vehicle manufacturers, calibrated to help restore original designed performance.
What does the triple-lip fluid seal do?
The triple-lip fluid seal is designed to reduce the chance of oil and gas leaking out of the shock, helping it maintain consistent damping performance.
What are signs my shocks may need replacing?
Common signs include excessive body movement, reduced stability during lane changes, longer stopping, uneven tire wear, or fluid leakage. Diagnose the cause before replacing.
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