Built through GM's joint venture with Isuzu, the W-Series (W3500/W4500/W5500) was a rebadged Isuzu N-Series whose 45-degree tilting cab let mechanics reach the entire engine in seconds — a maintenance trick still beloved by fleet shops today.
Trouble with your W4500?
Describe the symptom and Mike — the free AI truck consultant — will help you figure out what's wrong, which part is involved, and whether it's safe to drive. Free, no account.
Common replacement parts
Real products from the PartsNow catalog. Confirm fitment with Mike before ordering.
3030HNTRX
3030HNTRX - 3030 SPEC LONG SHAFT HNTRX BRAKE CHAMBER
OTR10143
OTR10143 - AUTO SLACK ADJUSTER, 11/2-10DRIVE 5.5,6.5
5-808330
5-808330 - BRAKE KIT FOR 4709DEN SHOES
370036A
370036A - OIL BATH SEAL
348-4195
348-4195 - HUB CAP (SENTINAL LARGE DIAM)
5008414PGBXW
5008414PGBXW - AIR DRYER CARTRIDGE, PURAGUARD
11444
11444 - GLADHAND BRACKET MOUNT
15W40 OIL
15W40 OIL - 15W40 OIL (ROTELLA) GAL JUG
