U-Joint Series Numbers Explained: Matching 1310/1330/1350 to Your Driveshaft

A “1310,” “1330,” or “1350” series number tells you the bearing cap diameter and overall cross size of a universal joint — not the vehicle it fits. Two joints with the same series number can still differ in cap-to-cap width, retention style (snap ring vs. U-bolt), and greasability. Before you order a replacement, confirm the series number against your existing joint’s dimensions, not just the application it’s listed for.

Why U-Joint Series Numbers Exist

Universal joints are built around a cross-shaped center piece (the “spider” or “cross”) with four trunnions, each seated in a bearing cap. The industry groups these crosses into standardized series — 1310, 1330, 1350, and larger — originally set by Spicer/Dana and now used as a common reference across most manufacturers, including Neapco, GMB, Moog, and Weasler. The series number increases with torque capacity and physical size: a 1350 series joint is larger and rated for more torque than a 1310, and a 1310 is larger again than the lighter-duty 1210/1100 series used on smaller driveshafts and farm PTO shafts.

The number itself doesn’t encode a single dimension — it’s a catalog designation. That’s why two joints both marked “1310” can still differ slightly in bearing cap OD or cap-to-cap width depending on the yoke style they were designed for. Series numbers get you to the right family fast, but they don’t replace measuring your actual joint.

1310 vs 1330 vs 1350: What Actually Changes

The table below gives typical dimensions published across the major aftermarket catalogs for each series. Treat these as a starting reference, not a guarantee — always cross-check against your own joint or your vehicle’s OEM part number before ordering.

Notice that 1330 and 1350 can share the same overall width while differing in bearing cap diameter — this is exactly why “looks about the same size” isn’t a safe way to match a joint. A 1330 cap will not seat correctly in a yoke machined for a 1350, even though the joints look similar from across the shop.

What to Check Before You Buy

Match the series number to your driveshaft first, but don’t stop there. Check cap-to-cap width and cap diameter against your yoke directly — two joints of the same series can still differ in these dimensions across vehicle applications, especially once you’re cross-shopping between OEM, Spicer/Dana, Neapco, and GMB part numbers. Confirm whether your application needs a greasable joint (with a zerk fitting for periodic lubrication) or a non-greasable, sealed-for-life joint, since swapping joint types on the same shaft can change your maintenance schedule. If you’re replacing a joint on a specific vehicle or PTO shaft, match against the OEM part number or confirm fitment by year/make/model rather than by series number alone — the same physical joint size shows up across many different applications, and series number alone won’t tell you which yoke bolt pattern or retention style you need.

If you’re not sure which series you currently have, the most reliable method is direct measurement: measure cap-to-cap width (outside edge to outside edge across two opposite caps) and bearing cap diameter with calipers, then compare against published series dimensions or the OEM part number stamped on the joint itself. Guessing from a parts-counter chart alone is how the wrong joint ends up back in a box.

Combination and Conversion Joints

When a driveshaft has a different series on each end — common on trucks that have been upgraded for towing or on shafts paired with a mismatched transmission or axle — a combination (or “combo”) U-joint bridges the two series in a single cross, for example a 1310-to-1330 or 1330-to-1350 combination joint. These aren’t a universal fix: they’re built for a specific pairing, so you still need to confirm both series numbers (and both cap diameters) before ordering a combo joint rather than two matched standard joints.

Common Symptoms of a Worn or Mismatched Joint

A worn U-joint typically shows up as clunking on acceleration or deceleration, a clicking or popping noise in tight turns, visible play when you try to rock the yoke by hand, or vibration that increases with speed. A mismatched joint — one that’s technically installed but not quite the right series or dimension — can mimic these same symptoms even when brand new, because the cap isn’t seating fully in the yoke. If a freshly installed joint still clunks or feels loose, the first thing to re-check is fitment, not the part’s quality.

Shopping by Series vs. Shopping by Vehicle

If you already know your series number and cap dimensions, shopping by series is faster and lower-risk. Our Spicer 5-153X U-Joint Kit (1310 Series) is a good example of a part listed by series designation first, with vehicle fitment as secondary confirmation. If you’re starting from a vehicle rather than a known series, our Automotive universal joint replacement guide walks through sourcing by application and cross-referencing against GMB, Spicer, and Moog part numbers.

FAQ

Can I use a 1350 joint where a 1330 is specified? Not without checking the yoke. Even where cross widths overlap, the bearing cap diameter usually doesn’t, so a 1350 cap won’t seat in a 1330-machined yoke without modification.

Do all 1310 series joints use the same retention method? No — some use internal or external snap rings, others use U-bolt or strap retention. Confirm retention style along with series number, since it changes the yoke hardware required.

Is a higher series number always “better”? It means higher torque capacity and larger physical size, not inherently better — it has to match what your driveshaft and yokes were designed for. Oversizing a joint doesn’t improve reliability if the yokes aren’t rated for it.

Browse our full coupling and U-joint selection to compare series, brands, and retention styles side by side.