If you've started hearing a nasty clicking sound while turning or noticed grease sprayed all over your suspension, it's probably time for a Polaris Ranger 900 XP rear axle replacement. It's one of those repairs that sounds way more intimidating than it actually is. Most of the time, these axles give up the ghost because a CV boot tore and let a bunch of grit into the joint, or maybe you're just running a big lift and 30-inch tires that put a lot of extra stress on the drivetrain. Whatever the reason, you don't need to drop a few hundred bucks at the dealership to get it fixed. You can honestly knock this out in an afternoon with some basic tools and a bit of patience.
How do you know the axle is actually shot?
Before you go tearing everything apart, you want to be sure it's the axle and not something else like a wheel bearing or a blown-out bushing. Usually, the first sign is that rhythmic click-click-click when you're moving at low speeds, especially if you're under load. If you crawl under the machine and see a torn rubber boot, that's your smoking gun. Once that rubber rips, the high-temperature grease flies out and mud gets in. At that point, the internal bearings are basically grinding themselves into dust.
Another thing to check is "play" in the axle. Grab the shaft and give it a good shake. A little bit of in-and-out movement is normal—the axle needs to plunge as the suspension moves—but if it's wobbling up and down or feels "crunchy" when you rotate the wheel by hand, you're definitely looking at a replacement.
Getting your tools and workspace ready
You don't need a professional shop for this, but having the right stuff on hand makes the job go a lot smoother. You're going to want a solid floor jack and some jack stands. Never work on a machine held up only by a jack; these Rangers are heavy, and it's just not worth the risk.
For the actual work, you'll need: * A 27mm socket (for that big axle nut) * A socket set (15mm is common for the suspension bolts) * A pair of needle-nose pliers for the cotter pin * A torque wrench (if you want to be precise) * A pry bar or a large flathead screwdriver * Maybe a rubber mallet or a dead-blow hammer
It also helps to have some rags and maybe some brake cleaner to tidy things up once you get the old, greasy mess out of there.
Step 1: Getting the wheel off and the nut loose
First thing's first: get your Ranger up on stands. I like to loosen the lug nuts while the tires are still touching the ground so they don't spin on me. Once it's up and the wheel is off, you'll see the cotter pin sitting in the middle of the hub. Straighten that thing out with your pliers and pull it out. Don't worry if it breaks; you should probably use a new one anyway when you put it back together.
Now comes the fun part: the 27mm axle nut. These things are usually on there pretty tight. If you have an impact wrench, this is its time to shine. If you're doing it by hand, you might need a long breaker bar. Once that nut is off, you should see the washer behind it—keep track of which way it's facing so you can put it back exactly how it was.
Step 2: Clearing the path
To get the axle out, you need to move the hub assembly out of the way. On the Polaris Ranger 900 XP, you usually only need to remove the long bolt that holds the upper or lower A-arm to the bearing carrier (the knuckle). I usually go for the upper one.
Once you pull that long bolt out, the whole knuckle assembly should tilt outward. You might have to give it a little nudge with your mallet. Be careful not to put too much tension on your brake lines here. You don't necessarily have to take the brakes off, but just make sure you aren't hanging the whole weight of the hub on that rubber hose. I usually use a piece of wire or a bungee cord to tie the hub to the frame so it stays out of my way.
Step 3: Pulling the old axle
With the hub tilted out, you should be able to slide the outer end of the axle (the "stub") right out of the wheel bearing. If it's stuck, a light tap with a hammer on the end of the shaft usually does the trick—just don't mushroom the threads if you're planning on keeping the axle as a spare.
Now for the part that frustrates people: getting the inner CV joint out of the transmission. There's a little C-clip (a "circlip") inside there holding it in place. You can't see it, but it's there. The trick isn't to pull slow and steady; you need a sharp, quick "jerk" motion. Grab the axle shaft, make sure it's as straight as possible, and give it a hard pull away from the machine.
If it's being stubborn, this is where the pry bar comes in. Slide it behind the inner CV housing (the green or black "cup" near the engine) and give it a quick pop against the transmission case. Just be careful not to gouge the aluminum or mess up the oil seal. It should "pop" and slide right out.
Step 4: Installing the new axle
Before you slide the new one in, take a second to look at the hole in the transmission. Make sure the old oil seal isn't torn and that there isn't a bunch of dirt in there. I always like to put a little bit of clean grease on the splines of the new axle to help it slide in easier and prevent it from seizing up later on.
Make sure the C-clip on the new axle is centered. Slide the axle into the transmission and give it a firm push. You should feel (and sometimes hear) it click into place. Give it a little tug to make sure it's locked in. If it slides right back out, you haven't seated it far enough yet.
Step 5: Putting it all back together
From here, it's basically the reverse of what you just did. Slide the outer end of the axle into the hub. Tilt the knuckle back up and slide that long A-arm bolt back through. It can be a little tricky to line up the holes, so using a screwdriver as an alignment punch helps.
Put your washer and that big 27mm nut back on. You'll want to get this pretty tight—usually around 80-110 foot-pounds depending on the specific year, but "good and tight" with a long bar is how most trail-side repairs go. Don't forget the cotter pin! If the hole doesn't line up, tighten the nut a tiny bit more until it does. Never loosen it to make the hole line up.
Throw the wheel back on, torque your lug nuts, and let the machine down.
A few tips for the road
While you're doing your Polaris Ranger 900 XP rear axle replacement, it's a great time to check your other components. How do the bushings look? Are the wheel bearings smooth, or do they feel gritty? It's much easier to fix that stuff now while you already have the tools out and the wheel off.
Also, think about why the axle broke. If you have a lift kit, the angles might be too steep for the stock axles to handle. In that case, you might want to look into "heavy-duty" aftermarket axles like Rhinos or Demons. They have a higher range of motion and can handle those steep angles without binding up and snapping.
Once you're done, take it for a slow spin around the yard. Listen for any weird noises. If everything sounds quiet, you're good to go. It feels pretty good to save a few hundred bucks in labor and know that the job was done right. Plus, now that you've done it once, you'll be the person everyone asks for help when their axle snaps on the trail!