What The 85989 Is
The 85989 is an aftermarket heavy-duty shock absorber built for semi-truck suspension service. It is a damper, not a spring — it controls the motion the springs and bushings allow. On a tractor it works constantly, cycling every time the axle moves under load, over expansion joints, and across dock aprons.
This is a direct replacement unit from World Truck Parts. It is sold to replace a worn or leaking shock in the same mounting position, using the same mounting style and travel as the unit you removed. It is not a lift or ride-height component and it does not change how the suspension sits.
Shocks are a wear item on a schedule, not a fail-once item. Most fleets replace them in axle pairs so damping stays even side to side. Replacing one side only leaves the truck with mismatched control, and that shows up as a pull or a shimmy at highway speed.
Why These Numbers Cross
The number 85989 and the cross-reference F02740S235 describe the same physical shock: same mounting style at each end, same extended and collapsed length, same damping range. Different catalogues carry different numbering schemes for identical hardware, which is why one shock ends up under two part numbers depending on who printed the box.
That is what a cross-reference is for. If the tag on your old shock reads F02740S235, or the paperwork from the last service lists it, the 85989 is the aftermarket number that maps to it. Other manufacturers' numbers appear here for identification only — we are not affiliated with or authorised by any OEM.
A cross-reference is a starting point, not a fitment promise. Confirm by VIN through your dealer, or by reading the number cast or stamped on the shock you just pulled. Also measure: extended length, collapsed length, and the mount type at both ends. If any of the three differ, stop and re-check before you order.
Checks Before You Order
Pull the old shock and look at it. Oil wet down the body means the seal is gone and damping is finished. A dented or bent body, a scored piston rod, or a bushing you can rock by hand all mean replacement. Some units weep slightly at the seal and still work — heavy oil film running to the bottom mount does not.
Check the mounts while the shock is out. Blown eye bushings, elongated pin holes, and cracked brackets kill a new shock fast. Torn bushings let the shock hammer instead of damp, and the new unit will be knocking again inside a few thousand miles. Replace hardware and bushings at the same time.
85989 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 85989. 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 | F02740S235 |
Frequently asked questions
Is 85989 the same shock as F02740S235?
They cross to the same physical part — same mounting style, same length range, same damping duty. The two numbers come from different catalogue systems. Verify against the number on your old shock or by VIN before ordering, since cross-reference data identifies a part but does not guarantee it fits your specific chassis build.
How do I know my shocks are worn out?
Look for oil running down the body, which means the seal has failed. Bounce test each corner and watch how fast it settles. Cupped or feathered tire wear, a floaty front end, and axle hop under braking all point at dead dampers. Also check the eye bushings for cracks and play.
Do I need to replace both sides?
Replace in axle pairs. A new shock on one side and a worn one on the other gives you uneven damping, which shows up as pull, shimmy, or uneven tire wear. Most shops replace both sides on the axle, and many do all positions at once so the whole truck is on the same service interval.
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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Every part below is a Premium Quality aftermarket Direct Replacement with published OEM cross-reference numbers, a 6+ month warranty and same-business-day shipping from Tacoma, WA. Not sure it fits? Run your VIN — or call and a person who knows trucks will verify fitment before you pay.