Yukon Gear Yoke For GM 10.5in 14 Bolt Truck / 1410 / Strap Style

A pinion seal on a 3/4-ton or 1-ton GM truck that keeps weeping after you replace it, a clunk from the rear when you go from drive to reverse, or a driveshaft that has been built up to 1410 joints for towing all point back to the pinion yoke. This is the Yukon Gear and Axle YY GM14T-1410-30S, a 30-spline, strap-style pinion yoke for the GM 10.5 inch 14-bolt rear used under Chevrolet and GMC C20, C30, K20, 2500 and 3500 pickups, Suburbans, G-vans and Express vans. It is sized for a 1410 series U-joint.

What the pinion yoke does in a GM 14-bolt

The yoke slides onto the 30 pinion splines and is clamped in place by the pinion nut. The rear U-joint of the driveshaft sits in its ears and is held by two straps and four bolts, so every pound of torque from the transmission passes through it into the ring and pinion. The machined neck of the yoke is also the running surface for the pinion seal, which is why a worn yoke shows up as a leak as often as a noise. On this part the ears are machined for a 1410 joint: 1.188 inch bearing caps with a 4.188 inch span between outside snap rings. The 1350 version, the YY GM14T-1350-30S, uses the same 1.188 inch cap but a shorter 3.625 inch span, so the two are not interchangeable without changing the joint.

Symptoms of a worn yoke

• Gear oil on the inside of the yoke and the driveshaft, coming back weeks after a new pinion seal because the seal lip rides in a groove worn into the neck
• A clunk on takeoff or on and off the throttle from wallowed yoke splines
• Vibration that rises with road speed from damaged cap seats or a yoke that no longer runs true
• Strap bolts that keep backing out, or stripped threads in the ears
• Pinion or carrier bearing growl at the same time, a common 14-bolt failure, which means the yoke should be replaced during a bearing job rather than reused

How to confirm before ordering

Unbolt the driveshaft at the rear and look at the joint. Measure across the bearing caps from snap ring to snap ring: about 4-3/16 inches is a 1410, about 3-5/8 inches is a 1350. Then grab the yoke and try to rotate it back and forth independent of the pinion; any free play means worn splines or a loose nut. Wipe the seal neck and drag a fingernail across it. A groove you can catch will leak with any new seal. If you also feel play in the pinion itself, the bearings are worn and the job becomes a rebuild with a 14-bolt master overhaul kit (that kit is for 1988-and-older axles; check yours before ordering).

Fitment

Yukon lists this yoke across several generations of the GM 10.5 inch 14-bolt: 1973-1986 C20 and C30, K20 4WD trucks, 1988-2000 C2500 and C3500, 1991-2002 C3500HD, 1992-1999 C2500 Suburban, 2002-2006 Avalanche 2500, 1975-1996 G20 and G30 vans and 1996-2015 Express 2500 and 3500, plus GMC versions of the same trucks. Yukon's chart groups those axles as 1988-and-older, 1984-1985, 1989-1998 and 1999-up 14-bolts, and this one yoke is listed for all of them. Many of these trucks left the factory with a 1350 rear joint, and many have had driveshafts changed since, so what matters is the joint on your shaft, not the model year. Count 30 pinion splines, confirm a strap-style rear, and measure the joint, or send us your year and VIN to check. More 14-bolt parts are in our hard parts collection.

Install notes

• Mark the driveshaft to the yoke before removal so it goes back in the same phase, and count threads or mark the pinion nut position before you pull the old yoke
• Use a puller such as the Lisle heavy-duty yoke puller; hammering the yoke off can damage the pinion bearings
• Fit a new pinion seal every time the yoke comes off, and lube the seal lip
• The 14-bolt uses a crush sleeve for pinion preload. Do not just crank the nut down; set preload by measuring turning torque. Many builders switch to a 14-bolt crush sleeve eliminator kit during this job
• If your driveshaft has a 1350 joint and you want to keep it, a 1350 to 1410 conversion U-joint bridges the two sizes; while the shaft is down, check the axle shaft seals and bearings too, and the 14-bolt axle bearing and seal kit covers the wheel ends
• Torque the strap bolts to spec, top off with 75W-90 or 75W-140 gear oil, and check the driveline angle if the truck has been lifted

What U-joint size does this yoke take?

A 1410 series joint with 1.188 inch caps and a 4.188 inch span between outside snap rings. It is a strap-style yoke, so it uses straps and bolts, not U-bolts.

Does it fit both the early and the 1999-up 14-bolt?

Yukon's fitment chart lists this yoke for 1988-and-older, 1984-1985, 1989-1998 and 1999-up GM 10.5 inch 14-bolt rears. All use a 30-spline pinion. Confirm the joint size on your driveshaft before ordering.

My truck has a 1350 rear joint. Can I use this yoke?

Only with a 1350 to 1410 conversion U-joint, or by rebuilding the driveshaft end to 1410. If you want to keep the 1350 joint, order the 1350 version of this yoke instead.

Will a new yoke stop my pinion seal leak?

If the leak comes from a groove worn into the old yoke neck, yes, as long as you also fit a new seal. If the pinion has bearing play, the seal will keep failing until the bearings are replaced.

What gear oil does the 14-bolt use?

75W-90 or 75W-140 gear oil is typical for the 10.5 inch 14-bolt. Add friction modifier if the axle has a limited slip, and refill after the job since some oil is lost when the yoke comes off.