What This Shock Does
A shock absorber on a Class 8 chassis is not there to hold the truck up. The springs or air bags carry the load. The shock controls how fast that suspension moves, damping the up-and-down travel so the axle stays planted and the cab stops oscillating after a bump instead of continuing to float.
Part 21462380 is an aftermarket direct replacement damper for Mack and Volvo heavy-duty suspension positions. It is a hydraulic telescopic unit with mounting ends sized to the original hardware, so it drops into the existing brackets and bushings without modification when the application matches.
Shocks are wear items and they wear in pairs. Replacing one side and leaving a tired unit on the other gives you uneven damping across the axle, which shows up as pull under braking and as uneven tire wear within a few thousand miles. Do both sides on the axle.
Why These Numbers Cross
21462380 and F02353S235 refer to the same physical damper. One is the number carried on the truck-side parts list, the other is the reference number used in aftermarket and supplier catalogs. Different cataloging systems, same extended length, same collapsed length, same mount configuration, same damping range. That is what makes them interchangeable in a listing.
This matters because the number stamped on a shock body often has nothing to do with the number in your parts system. A shock that was replaced once before may carry a supplier reference like F02353S235 while your maintenance record still shows 21462380. Both point at the same part.
These numbers are listed here for identification only. PartStop is not affiliated with, endorsed by, or authorised by Mack or Volvo, and the manufacturer numbers are shown so you can match what you are holding against what we sell.
Checking Before You Order
Pull the old shock and read it. The number on the body, or on a band around the tube, is the most reliable thing you have. Paperwork lies, previous repairs get logged wrong, and trucks in the same fleet spec differently depending on build date and suspension package.
If the old unit is unreadable, measure. Get extended length eye-to-eye, collapsed length eye-to-eye, and note the mount type at each end — eye, stud, or bar pin. Then confirm against the VIN build sheet. Cross-reference is a starting point, not a fitment guarantee, and the VIN or the number on the old part settles it.
21462380 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 21462380. 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 | F02353S235 |
Frequently asked questions
How do I know when a heavy truck shock is actually worn out?
Look for oil weeping down the tube — a light film is normal on some units, but running wet means the seal is gone. Check for loose or collapsed bushings at the mounts, a bent body, and cupped tire wear on the axle. If the truck keeps bouncing after crossing a bump, the damping is done.
Does 21462380 replace F02353S235 directly?
Yes, those two numbers reference the same damper in different catalog systems. Either number gets you the same part. Still confirm against the number on the shock you are removing, or against the VIN build sheet, before you order a set.
Do I have to replace shocks in pairs?
Replace both sides of an axle at the same time. A new shock on one side and a worn one on the other means the axle damps unevenly, which causes pull under braking and uneven tire wear. The cost of the second unit is far less than a scrubbed tire.
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.