What This Arm Is and Where It Goes
This is a torque arm off a trailer air-ride or spring suspension setup — the link that runs from the axle seat back to the hanger bracket, keeping the axle from rotating under braking and acceleration torque. The 15-1/2" measurement is center-to-center on the bushing bores, and that's the number that actually matters, not the brand name stamped on the old one.
You'll find this length on a lot of Fruehauf-built trailers and other rigs running Meritor-style suspension components, but Fruehauf wasn't the only one who bought this length from their suppliers, so don't assume trailer brand tells you the arm length. Pull the old arm and measure eye-to-eye before you order.
Bushings aren't included as a rule on most of these — check what's pressed in yours now, rubber or poly, and make sure the bore size matches what you're ordering. If the bushings are shot, that's a separate line item, not something this arm fixes on its own.
Why All These Numbers Point to the Same Part
R302514 is the Meritor/Automann-family number, FR4B is Bendix-Westinghouse's tag for it, and TR021 is Automann's own catalog number for the same 15-1/2" arm — same casting, same bore spacing, different box labels. The UXA and TDAR numbers you'll see are Automann's Fruehauf-specific application codes, which is why they show up together — same physical part, cataloged under the OE application it replaced.
Where guys get burned is grabbing an arm that's close in length but not exact, or one with the wrong bushing bore diameter for their hanger casting. A half inch off on length puts the axle out of alignment under load, and you won't notice until your tires are cupping or your ride height's off on one side.
Confirm by measuring your old arm end-to-end and checking the bushing ID, or pull the trailer's axle/suspension tag if it's still legible. If you've got a partial number off the old part, call it in — most of the time we can match it faster that way than guessing off a parts book.
Ordering From PartStop
We keep this length in stock at the Tacoma counter for guys who need it same-day — walk in, match it against your old arm right there, walk out. If you're not local we ship it nationwide, usually next-day once it's boxed.
Comes with the standard 6+ month warranty. If it's the wrong length or bore for your application, we'll get you swapped — just don't cut the old bushings out before you're sure the new one's a fit.
One more thing: if your trailer's had suspension work done before, don't trust the axle tag blindly — somebody may have swapped parts already. Measure what's actually bolted on there now.
R302514 Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to R302514. 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 |
|---|---|
| Cross-Reference | Automann TR021, ATMTR021, WA12-5037, TM68-11 |
| Bendix-Westinghouse | BWP FR4B |
| Automann (Fruehauf application) | E-2515, UXA-000026, UXA00261, UXA0026001, TDAR302514, UXA-0026 |
Frequently asked questions
Does R302514 fit my Fruehauf trailer?
Probably, if it's running the 15-1/2" torque arm length — that's the common length on a lot of Fruehauf air-ride and spring suspensions. But 'Fruehauf' isn't a guarantee of length, they used more than one arm length across their lineup. Measure your old arm center-to-center on the bushing bores before you order, or give us the number off the old part and we'll confirm.
Is this the same as the Automann TR021?
Yes — TR021 is Automann's number for this same 15-1/2" arm, it just crosses over to the Meritor-style R302514 and the BWP FR4B casting. Same physical part, different catalog tags. Confirm length and bushing bore against your old arm regardless of which number's stamped on it.
Do I need new bushings when I put this arm on?
Not necessarily, but check what's in there now. If the rubber's cracked or the poly's chewed up, replace them while you've got the arm off — it's a lot cheaper to do it now than to pull it apart again in six months because the bushing failed and let the arm walk.
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.