What This Shock Does
A shock absorber does not hold the vehicle up. The springs or air bags do that. The shock controls how fast the suspension moves through its travel, damping the spring so the axle settles instead of oscillating. On a heavy truck that means tire contact stays consistent and the load stops rocking after every expansion joint.
F02730S235 is a direct replacement unit built to the same mounting pattern and travel as the 85066 it supersedes. Hydraulic damping, sealed body, with the eye or stud ends matched to the original application so the existing hardware goes back in without modification.
Shocks are a wear item on a service schedule, not a fail-and-fix part. Damping fades gradually and the driver adapts to it, which is why worn shocks usually get caught at inspection or by tire wear rather than by a complaint.
Why 85066 Crosses To F02730S235
These two numbers describe the same physical shock in different catalogs. 85066 is the reference number stamped or tagged on the unit you are replacing. F02730S235 is the World Truck Parts number for the aftermarket equivalent, built to the same extended and collapsed lengths, the same end-mount configuration, and the same damping range.
A shock crosses on four things: collapsed length, extended length, upper mount type, and lower mount type. Get those four right and the part physically installs and works. Bore and valving determine how it feels, which is why we match the damping characteristics rather than just the dimensions.
The 85066 number is listed here for identification only. We are not affiliated with, endorsed by, or authorised by any original equipment manufacturer, and listing their number does not imply any relationship. It is there so you can confirm you are looking at the right part.
Check Before You Order
Pull the old shock and read the number on the body or the tag before you commit. Trucks get re-shocked over their lifetime and what is bolted on now may not be what the build sheet says. If the tag is unreadable, measure collapsed and extended length and photograph both mounting ends.
Cross-reference is a starting point, not a fitment guarantee. Confirm against your VIN or the number on the part coming off the vehicle. Suspension configurations vary by axle position, ride height, and spec options even within the same model line, and a shock that fits the drive axle may not fit the steer.
F02730S235 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to F02730S235. 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 |
|---|---|
| Cross-Reference | 85066 |
Frequently asked questions
Do I have to replace shocks in pairs?
Replace per axle end, both sides, at the same time. A new shock on one side and a worn one on the other gives you uneven damping and the axle will walk under braking. The old side will fail soon anyway, so you are only buying yourself a second labour charge.
How do I know the old shock is actually bad?
Look for oil film running down the body from the seal, which means it has lost fluid and damping. Check the bushings at both mounts for cracking, play, or a worn-oval eye. Cupped or scalloped tire wear on that axle is another strong indicator. A shock that is cool to the touch after a road run is not working.
Will F02730S235 fit my truck if my old shock says 85066?
That cross is the right starting point, but verify before installing. Confirm the number on the part you removed and check collapsed length, extended length, and both mount types against the replacement. Fitment should be confirmed by VIN or by the number on the old part, not by the cross-reference alone.
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
Need the part, not just the reading?
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.