Cushion every bump and steady the ride with the KYB shock absorber P/N 346603, a nitrogen gas-charged, twin-tube Excel-G rear shock. It's a direct-fit replacement for the 2003-2009 Chevrolet C4500 Kodiak and C5500 Kodiak, plus the 2003-2009 GMC C4500 Topkick and C5500 Topkick.
Built on the same KYB OE assembly lines using OE-quality components, the Excel-G is calibrated to restore a vehicle's original, designed damping rather than change it — the classification KYB calls OEA (Original Equipment for the Aftermarket). KYB recommends it as an OEM replacement for heavy-duty trucks and commercial vehicles.
- Nitrogen gas-charged twin-tube design: helps restore the designed control and handling of your vehicle.
- 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 intended suspension behavior.
Made in USA. Worn shocks often show up as excessive bounce, nose dive under braking, or reduced stability, so if the original rear shock is the cause, this KYB gas shock absorber replaces it. Sold individually; replacing both rear shocks together is recommended for balanced handling.
Interchange: 12100534 · 15185643 · 15185644 · 15782915 · 65172
This part cross-references / interchanges with the following part numbers:
Frequently Asked Questions
What vehicles does the KYB 346603 shock fit?
It's a direct-fit rear shock for the 2003-2009 Chevrolet C4500 and C5500 Kodiak, plus the 2003-2009 GMC C4500 and C5500 Topkick. See the Buyer's Guide tab to confirm your vehicle.
Is this a gas shock absorber?
Yes. This KYB gas shock absorber Excel-G uses a nitrogen gas-charged, twin-tube design and is built on the same KYB OE assembly lines with OE-quality components.
Which position is this shock for?
It is a rear shock absorber for the listed applications.
Do I need to replace shocks in pairs?
They're sold individually, so this listing is for one. Replacing both rear shocks together is recommended for even, balanced handling.
What are signs my shock needs replacing?
Excessive bounce, nose dive under braking, or reduced stability can signal a worn shock. Diagnose the cause first; if the original rear shock is at fault, this replaces it.
Write a Review