What You're Actually Buying
This is a wheel end output seal, not the whole hub assembly. It rides in the axle housing where the axle shaft comes through, sealing gear lube on one side and keeping road dirt and water out on the other. On an RT-34-145 rear, that seal takes a beating from heat cycling and constant rotation, so it's a normal wear item on any truck with real miles.
Volvo spec'd Meritor axles across a lot of their day cab and sleeper lineups, so this seal shows up whether you're running a VNL, VHD, or older VN-series truck. Application isn't really about the truck badge though - it's about which axle carrier is bolted underneath.
Comes 4 to a pack because if you're pulling one output seal for a leak, the other three are usually not far behind on time and mileage. Cheaper to do them together than pay labor twice.
How the Cross Numbers Line Up
A1-1205Y2729 cross-references to Stemco 72905 and the aftermarket numbers 30008 and 100495. These aren't coincidence - Meritor's seal spec for the RT-34-145 output bore has stayed consistent for decades, so multiple seal manufacturers built to that same bore diameter, shaft diameter, and lip configuration.
Where guys get burned is assuming any Meritor-badge seal number means it fits every RT-series axle. It doesn't. Bore size and shaft diameter change across the RT-34, RT-40, and RT-46 families, and even within the -145 designation there were running changes over the years. A seal that's a hair off on ID or OD will still go in with a little persuasion and then leak in six months.
Rule of thumb: pull the old seal and read the number off it, or better yet get the axle tag data or full VIN and check the Meritor parts lookup before you order. If the old seal's numbers matches or lines up with what's in the cross-reference table, you're good.
Ordering From Us
We're in Tacoma and keep this seal in stock for same-day pickup or will has it on your counter that afternoon if you call ahead. Fleet accounts running multiple trucks through here know we don't jerk them around on availability.
Ship nationwide too, so if you're not local this still gets to you fast - most orders move next-day or two-day depending on where you're at.
Comes with the standard 6+ month warranty. If it turns out the fitment's wrong after you've confirmed by VIN or part number, call us before you install it - once it's greased up and in the housing we can't take it back.
A1-1205Y2729 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to A1-1205Y2729. 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 |
|---|---|
| Stemco | 72905 |
| Aftermarket | 30008, 100495 |
Frequently asked questions
Does A1-1205Y2729 fit my 2015 Volvo VNL with a Meritor rear?
Probably, if it's actually running an RT-34-145 axle - that's the common spec on a lot of VNLs from that era, but Volvo did offer other axle options depending on spec. Check the axle tag on the carrier housing or run the VIN before you order, cheaper than guessing.
Is this the same as Stemco 72905?
Same physical seal, different label - Stemco 72905 crosses directly to A1-1205Y2729 for the RT-34-145 application. Confirm by comparing the old seal's numbers or bore/shaft dimensions if you don't have a number to go off of.
Why does this come in a 4-pack instead of single seals?
Most guys doing a tandem rear end up needing seals on both axles, both sides. Buying the 4-pack usually works out cheaper than ordering singles twice, and if you've got a leak on one you're probably not far off on the others anyway.
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.