What The 83911 Is
The 83911 is an aftermarket hydraulic shock absorber built for heavy-duty truck suspension service. It damps axle movement so the springs or air bags stop cycling after a bump. On a tractor, that means controlling axle hop under load, keeping tire contact steady, and taking stress off bushings, U-bolts and air bag pistons that would otherwise absorb the motion.
Physically it is a sealed tube shock with mounting eyes or pins at each end, depending on the position it was built for. The internal valving is set for loaded truck weights, not light-duty, so it will feel stiff by hand compared with a pickup shock. That is normal for this class of damper.
Shocks are always replaced in pairs across an axle. A new unit on one side and a worn unit on the other gives you uneven damping, which shows up as a pull on rough pavement and as uneven tire wear over the next few thousand miles.
Why These Numbers Cross
F03464S235 is the OE-style cross-reference for this shock. Numbers cross when the physical build matches: extended and collapsed length, mount style at each end, bushing or pin diameter, and damping range. If those five things line up, the shock does the same job in the same bracket regardless of whose number is stamped on the tube.
The 83911 is the World Truck Parts number for that same build. F03464S235 is listed here for identification only. PartStop is not affiliated with, endorsed by, or authorised by any original equipment manufacturer, and referencing their number does not imply otherwise.
A cross-reference is a starting point, not a fitment guarantee. Confirm against your VIN or against the number stamped on the shock you just pulled off. Fleet trucks get re-sprung, re-axled and mixed-and-matched over their lives, so the number on the truck beats the number in any catalog.
How Shocks Fail
The obvious failure is a blown seal. You will see oil streaking down the tube from the rod seal, usually collecting dust into a dark film. Once the oil is out, the shock is a strut, not a damper. Wet dust on the body is enough reason to replace both sides of the axle.
The quieter failure is internal valve wear with no visible leak. Symptoms are a floating or wallowing ride, cab shake at highway speed, cupped tire wear, and air bags or leaf spring bushings that keep failing early. Pull the shock, cycle it by hand, and compare resistance side to side. A dead one moves noticeably easier.
83911 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 83911. Use them to identify the part — then confirm the exact fit by VIN or the number stamped on your old unit before you order. An interchange is a starting point, not a fitment guarantee.
| Brand / Line | Cross-Reference Numbers |
|---|---|
| OE/Cross-Ref | F03464S235 |
Frequently asked questions
Is 83911 the same shock as F03464S235?
It is listed as a direct replacement cross-reference for that number. The 83911 is an aftermarket part built to the same mounting and length specification. F03464S235 is shown for identification only. Verify by measuring your old shock and checking the mount style before you order.
What should I measure before ordering?
Measure extended length eye-to-eye or pin-to-pin, then collapsed length, then note the mount type at each end and the bushing bore or pin diameter. Those four figures decide whether a shock bolts in. Compare them against the old unit, not against a spec sheet for a truck that may have been modified.
Do I have to replace both shocks on the axle?
Yes, replace in pairs. Mixing a new shock with a worn one gives uneven damping across the axle, which causes the truck to react differently side to side on rough road and accelerates tire cupping. Do the pair, and inspect the mounting bushings and brackets while you are under there.
Not sure it fits? We check before you pay.
Run your VIN and we’ll match parts to your exact truck, or call the counter — a person who knows trucks verifies fitment by OEM number before the order ships. No wrong-box returns.
More cross-reference guides
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