What This Drum Fits
This is a brake drum, plain and simple — the part your shoes clamp down on when the driver hits the pedal. The 3807X size and bolt pattern got used across a bunch of trailer axles and some straight truck applications going back through Dayton, Dura, and FleetPride house-brand lines.
Because it's a common size, you'll see it under different part numbers depending on who's selling it — Gunite cast the original, Meritor sold it under their own number for axles they built, and outfits like ConMet and Alliance Truck Parts repackaged the same casting for their customers. Same drum, different sticker.
Don't guess off the truck year or axle brand alone. Pull the number off the drum you're replacing or run the VIN — drum sizing didn't always change with model year, and axle suppliers swapped mid-production more than once.
Why These Numbers Cross and What to Check
The interchange list here is long because this drum size/bolt circle got OE'd out to several axle builders. Meritor's 85123570002 and 53123544002, Mack's 2335-66854B, Navistar's 4115969C1 — those aren't coincidence, they're the same casting spec sold under each truck maker's own part number for warranty and dealer network reasons.
Where guys get burned is drum diameter and width — a 3807X-sized drum can look right and still be a hair off on brake diameter or the register bore, especially if someone's mixed a trailer drum in with a straight truck spec. Check the number cast into the drum itself, not just what's on the invoice from the last guy who worked on it.
Also worth a look: some of these cross numbers (like the Aftermarket 600026 or 38BD07AB) are reman or aftermarket-cast versions, not the original OE casting. Functionally they interchange, but if your fleet spec calls for OE-cast only, flag that before you order.
Ordering From PartStop
We stock this out of Tacoma and it usually goes out same-day if you order before cutoff — handy if you've got a trailer sitting on jack stands and a driver waiting. We ship nationwide too, so this isn't just a Pacific Northwest counter part.
Comes with our standard 6+ month warranty. If it's wrong for your application, we'll sort it, but the fastest way to avoid a return trip is confirming your old part number or VIN before it ships, not after.
3807X Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 3807X. 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 |
|---|---|
| Automann | 151.68607 |
| Alltrux | ATX3807 |
| Alliance Truck Parts | ABP N42A1658625B |
| ConMet | 10037830, 107638, 10012097 |
| Eaton | 973929 |
| Fleetrite | FLT4407B |
| Gunite (via Freightliner) | GUN 3807AX |
| Gunite | 3807AX |
| Meritor | 85123570002, 53123544002 |
| Mack Trucks | 2335-66854B |
| Midwest Wheel | WW 96854B |
| Navistar International | 4115969C1 |
| Volvo / Mack | 61120778 |
| Alliance | N42A1658625B, N42A10012097, N42A107638 |
| Aftermarket | 600026, 38BD07AB, 66854B, 66854F, 66855B, 77854BW |
Frequently asked questions
Does 3807X fit my trailer axle?
Probably, if your old drum is stamped 3807AX, 10012097, or 90486B — those are the direct matches here. But confirm off the number stamped on your current drum or the axle VIN plate before ordering, since a few axle builders used similar-looking drums with different diameters.
Is this the same as the Meritor 85123570002?
Same drum spec, yes — Meritor sold this casting under their own part number for axles they supplied. It cross-references to 3807X, but check your drum size and bolt pattern match before assuming it's a straight swap.
What's the difference between the OE Gunite 3807AX and the aftermarket numbers like 600026?
The Gunite number is the original casting; numbers like 600026 or 38BD07AB are aftermarket-produced drums built to the same spec. They interchange for fit and function, but if your fleet requires OE-cast parts only, ask before ordering.
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.