Kenworth Airglide 400 vs. 460: Which Suspension is Right for Your Truck?

ByThe Answerlode Editorial Team

Kenworth Airglide 400 vs. 460: What Sets Them Apart

The core difference is weight capacity and what the suspension is built to handle. The Airglide 400 maxes out at 40,000 lbs for highway work. The 460 goes to 46,000 lbs for rougher, vocational duty.

Weight Capacity

AG400: 40,000 lbs. AG460: 46,000 lbs. That extra 6,000 pounds shapes the entire design philosophy of each suspension.

Intended Duty

The AG400 is built for over-the-road linehaul, dry van operations, refrigerated transport, and highway cruising. Think dedicated routes and predictable road conditions. Fleets choose it when a smooth ride and low maintenance matter.

The AG460 is made for vocational work: dump trucks, heavy-haul operations, bulk tankers, and refuse hauling. It handles the extreme vertical and torsional stress of construction sites, grain loading, and equipment transport.

How the Suspensions Differ Mechanically

Both use air springs. The AG400 is a four-bag system tuned for isolation. It absorbs highway bumps and expansion joints with a car-like ride. The AG460 trades some smoothness for durability. Its stiffer design handles rough work without giving up.

The air bag pedestals are different heights between the two models. This means they use different part numbers. You cannot swap AG400 air bags onto an AG460 or vice versa.

Maintenance Needs

The AG400 has a zero-maintenance design. Fewer moving parts and premium bushings mean less downtime. It’s built to stay road-worthy between major services.

The AG460 needs more attention. Inspect at 60,000-mile intervals for air leaks, fastener condition, and damage to clamps and suspension links.

Which Model Is Right?

Run linehaul, dedicated dry van, or refrigerated work? The AG400 is your choice. You get the smoothest ride and the least maintenance overhead.

Running dump trucks, construction hauling, or bulk transport? The AG460 is built for it. The extra capacity and rugged design justify the weight you’re carrying.

When you’re evaluating a truck, your inspection should identify which suspension is installed. The air bag part numbers and suspension geometry are distinct. Your Kenworth dealer or a suspension specialist can confirm the model in minutes.

Frequently Asked Questions

Can I upgrade from an AG400 to an AG460?

Not easily. The pedestals, air bag part numbers, and suspension geometry differ. A full replacement would be needed, not a simple upgrade. It’s typically more economical to choose the right model upfront.

What’s the real-world difference in ride quality between the two?

The AG400 feels smoother on highways. It isolates bumps and expansion joints better. The AG460 feels stiffer because it’s built for rougher terrain. Linehaul drivers usually prefer the 400; vocational drivers expect the 460’s firmer ride.

How do I know which suspension my truck has?

Check your Kenworth documentation or service records. The air bag part numbers are different. A shop can also visually inspect the pedestal height and air bag configuration to confirm which model is installed.

Is the AG460 overkill for occasional heavy loads?

If you’re mostly running linehaul with occasional heavy loads, the AG400 is sufficient. The system is designed to handle 40,000 lbs consistently. If heavy loads are regular (multiple times per week), the AG460 makes sense.

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