What You're Looking At
This is an 11.25-inch brake drum, 10-bolt hub, made for the outboard position on heavy-duty axles — think dump trucks, dry vans, tankers, anything running that 6.5x7 pattern with a drum brake setup instead of discs.
These aren't small-truck drums. They're thick-wall castings meant to handle repeated heavy stops without cracking or going out-of-round on you after a few thousand miles. Cheap thin-wall drums will bite you here — you want the mass to soak up heat.
Outboard means it mounts on the outside position of a tandem or tag axle setup — check your old drum before you order so you're not putting an inboard drum where an outboard one goes.
Why These Numbers Cross
3807X, 3811X, and CV71005 all show up together because they're the same casting spec — same bolt circle, same drum diameter, same brake face width. Different suppliers, same physical part, which is why they interchange clean.
Where guys get burned on drums is bolt hole diameter and offset — two drums can look identical from across the shop but have a different hub pilot bore or a slightly different offset that throws your wheel bearing preload off. Also check inboard vs outboard — they're not interchangeable even if the bolt pattern matches.
Pull the number off your old drum, or better yet pull your VIN and axle tag if the drum's too worn to read. A drum that's the wrong offset by even a little will chew up your brake shoes unevenly or throw your wheel out of true.
Ordering From Us
We keep this one in stock in Tacoma, so if you're local you can grab it same day and get the truck back on the road instead of waiting on a special order. Ship it nationwide too if you're not close by.
At $10 this isn't a part you agonize over, but don't skip the fit check — a wrong drum on an HD truck is a bigger headache than the ten bucks you saved skipping the VIN check.
Comes with our standard 6+ month warranty. If it shows up cracked or doesn't match your old part's spec, call the counter and we'll sort it.
3811X Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 3811X. 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 | 3807X, CV71005 |
| Aftermarket | R930222, 64126B, 78500B |
Frequently asked questions
Does 3811X fit my International dump truck?
Probably, if it's running an 11.25" outboard drum on a 10-bolt hub — but pull the number off your old drum or check your axle tag against your VIN before ordering. Drum specs vary enough between axle builds that guessing costs you a return shipment.
Is this the same as the CV71005?
Yes, CV71005 cross-references to the same casting — same bolt pattern, same 11.25" diameter, same outboard offset. Different label, same drum. Still worth comparing your worn drum side by side if you've got it.
How do I know if I need inboard or outboard?
Outboard mounts on the outside wheel position of a tandem axle, inboard on the inside. They look similar but aren't interchangeable — check which one came off the truck, don't just go by axle position guesswork.
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.