Yukon Gear 4340CM Right Hand Rplcmnt Inner Axle For Dana 30 / 84-90 XJ / 97+ TJ / Uses 5-760X

The passenger-side inner shaft is the piece that gives up first in a lot of Dana 30 front axles, especially on a Jeep Cherokee XJ or Wrangler TJ with 33 inch or larger tires and a front locker. If you broke a shaft at the U-joint ears, twisted the splines, or just want to stop worrying about it before the next trail run, Yukon YA W38875 is a 4340 chromoly replacement for that one piece: the right-hand inner axle, 27 spline at the carrier end, 32.36 inches long, built to take the larger 5-760X series U-joint.

What the right-hand inner shaft does in a Dana 30

A Dana 30 front axle drives each wheel through two shafts joined by a U-joint. The inner shaft slides through the axle tube and engages the side gear in the carrier; the outer stub runs through the steering knuckle and hub. The joint between them lets the wheel turn while it is being driven. Left and right inners are different lengths, so they are not interchangeable. When a locker sends equal torque to both front tires and one is wedged against a rock, it is often this shaft or its yoke ears that fail.

Yukon makes this shaft from 4340 chromoly with cold rolled splines and induction heat treating. Measured from the end of the splines to the center of the U-joint bore it is 32.36 inches, which is how you should compare it with your old shaft.

Symptoms of a failing passenger inner shaft

• A crack or bang in 4WD followed by no drive to the passenger front wheel.
• Clicking or a dry squeak while turning in 4WD, often a U-joint that has run dry or a yoke ear that is spreading.
• A shaft that comes out with twisted, rounded or chipped splines.
• Gear oil seeping out at the passenger knuckle, pointing to a worn inner tube seal that should be replaced with the shaft.

How to confirm before buying

With the front end on stands and the transfer case in 4WD, turn the passenger wheel and watch the U-joint through the knuckle. Play in the cross, a cocked or cracked yoke ear, or a stub that turns while the inner does not tells you where the break is. Our Dana 30 front axle problems guide covers the related ball joint and bearing failures, and U-joint replacement symptoms helps separate a bad joint from a bad shaft.

Fitment

The listing title names the 1984-1990 XJ and 1997-up TJ Dana 30 front. Yukon's matching complete assembly is cataloged for 1984-2001 XJ, 1987-1995 YJ and 1997-2006 TJ Dana 30 fronts, so the 27 spline, 32.36 inch inner covers the same family, but there are important exceptions. Jeeps that use a vacuum disconnect on the passenger tube have a two-piece factory inner, so a one-piece shaft like this needs a disconnect delete. The TJ Rubicon used a Dana 44 front and does not take this part. Yukon also notes that older axles built with the smaller 260X joint need a matching 760X outer stub, such as the Yukon 4340 chromoly Dana 30 outer stub. Measure your old shaft, count its splines, or send us your year and VIN and we will confirm. More driveline parts are in our hard parts category.

Install notes

• Remove the hub and unit bearing, pull the stub and inner out together, and press the U-joint out on the bench.
• Install a new 5-760X series U-joint; do not reuse the old cross on a new chromoly shaft.
• Replace the inner tube seal before sliding the shaft in, and keep the splines centered so they do not tear it.
• Upgrading both sides? The matching Yukon left-hand Dana 30 inner completes the pair, and a complete 1541H right-hand assembly is an option if your outer stub is also damaged.
• If the carrier bearings are noisy, the Dana 30 master overhaul kit is the time to do them. Refill the front with 75W-90 gear oil to the bottom of the fill hole.

Is YA W38875 the passenger or driver side?

It is the right-hand (passenger side) inner front shaft for a Dana 30, 27 spline and 32.36 inches long. The left-hand inner is a separate part with a different length.

Does it include the U-joint or outer stub?

No. This is the inner shaft only. It is built for a 5-760X series U-joint, and you reuse or replace your outer stub. If your axle has the older 260X size joint, you also need a 760X outer stub.

Will it fit an XJ with the vacuum disconnect front axle?

Not as a direct swap. A disconnect axle uses a two-piece factory passenger inner, so a one-piece shaft like this requires a disconnect delete. Send us your year and VIN if you are unsure which axle you have.

Does it fit a TJ Rubicon?

No. The TJ Rubicon has a Dana 44 front axle with different shafts. This part is for Dana 30 equipped TJ models.

How do I measure my old shaft to compare?

Measure from the end of the splines to the center of the U-joint bore. This shaft is 32.36 inches by that measurement, and it should have 27 splines.