What The 5-281X Is
The 5-281X is a four-cap universal joint cross measuring 49.2 mm across the bearing cap diameter and 191.9 mm across the outside span of the caps. Those two dimensions are what define the joint. Everything else — grease routing, cap retention, seal design — varies between suppliers, but the cross body and cap geometry have to land on those numbers or the joint will not seat in the yoke.
This size sits in the heavy-duty driveline range, the sort of cross used in main and auxiliary driveshafts on Class 7 and 8 trucks and in off-highway driveline sections. It is a wing-style and round-bearing family size depending on how the yoke is built, so the yoke style on your shaft matters as much as the cross dimensions when you are ordering.
PartStop supplies this as a premium quality aftermarket u-joint under the 5-281X headline number. It is a direct replacement for the same dimensional joint. We are not affiliated with or authorised by any original equipment manufacturer, and every other brand number on this page is listed for identification only.
Why These Numbers Cross
Universal joints are catalogued by dimension, not by vehicle. Once a 49.2 x 191.9 mm cross exists, every driveline supplier assigns it their own code and the numbers stack up fast. That is why M281X, CP281X, US281X, D5281X, DS5281X, E5281X, SB5281X and ZJU5281X all carry the same 281 root — they are different houses describing the same physical cross.
The suffixed variants describe build features, not a different size. 5-281X-1, P5-281X, 5-281XMSI, 5-281XRM, SP5281X, SP5281XHP, 2104-5281X, 5-281-4X and 15-281X all sit on the same bearing dimensions. Suffixes typically flag greaseable versus sealed-for-life construction, cap retention style, or a heavy-duty bearing upgrade. Check which style came out of your shaft before you pick.
The 6-0281 group — 6-0281, 6-0281PQ, 6-0281Q, 6-0281GXL — and the DT281 and DT0601001-001 references follow the same pattern from different catalogues. Vehicle-side numbers such as Navistar 422910C91, Daimler 02-7074363, Euclid E4025348, AGCO AG711121, ACDelco 45U2375, Newstar S-2627 and moog-381 are the OE and fleet-supply codes that point back to this same dimensional joint.
Check Before You Order
Measure the old cross. Caliper the bearing cap outside diameter and the overall span cap-to-cap. You want 49.2 mm and 191.9 mm. A joint that is close but not exact will either refuse to seat in the yoke ears or go in loose, and a loose cap walks out under load. Measure the removed part, not a picture in a catalogue.
Then look at how the joint is retained — inside snap ring, outside snap ring, bearing plate, or wing style with cap bolts. Also note whether the original had a grease zerk and where it was aimed, because a zerk that fouls the yoke on reassembly means the joint goes back in the box. Confirm fitment by VIN or by the number stamped on the part you pulled.
U-joints usually fail from lack of grease or from a brinelled cap after running out of balance. Rust-coloured dust at the seal lips, a clunk on throttle transition, and vibration that changes with driveshaft speed all point the same way. Replace in pairs on the same shaft and inspect the centre bearing and yoke ears for elongation while the shaft is out.
5-281X Cross-Reference & Interchange Numbers
These manufacturer and aftermarket numbers commonly cross-reference to 5-281X. 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 | M281X, CP281X, US281X, 5-281X-1, P5-281X, 5-281XMSI, 5-281XRM, SP5281X, SP5281XHP, 2104-5281X, DT281, DT0601001-001, D5281X, DS5281X, E5281X, SB5281X, ZJU5281X, 6-0281, 6-0281PQ, 6-0281Q, 6-0281GXL, 15-281X, 5-281-4X, ACDelco 45U2375, AGCO AG711121, Daimler 02-7074363, Euclid E4025348, Navistar 422910C91, Newstar S-2627, moog-381 |
Frequently asked questions
Is 5-281X the same joint as 6-0281?
They are catalogued as the same 49.2 x 191.9 mm cross under different supplier numbering. The 6-0281 suffix variants — 6-0281PQ, 6-0281Q, 6-0281GXL — describe build level rather than a change in bearing dimensions. Confirm by measuring the cap diameter and cap-to-cap span on the joint you removed.
Does this u-joint come greaseable or sealed?
Both styles exist within this dimensional family, which is part of why the number carries so many suffixes. Check whether your original had a grease fitting and which direction it pointed, since a zerk in the wrong position can foul the yoke or the shaft tube. Specify the style you need when ordering rather than assuming.
Will a 5-281X fit my truck if the parts book lists Navistar 422910C91?
That number cross-references to the same dimensional joint, and it is listed here for identification only. A cross-reference is a starting point, not a fitment guarantee. Confirm by VIN or by matching the dimensions and retention style of the joint you pulled out of the driveshaft before you install.
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
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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.