If you're hearing a clicking sound when you turn, you probably need to know how to rebuild cv joint components before they fail completely and leave you stranded. It's one of those jobs that sounds intimidating because it involves "axles" and "drivetrains," but honestly, it's mostly just a messy, straightforward afternoon project. If you have some basic tools and don't mind getting grease up to your elbows, you can save a ton of money by rebuilding the joint instead of buying a whole new CV axle assembly.
Is your CV joint actually saveable?
Before you tear your car apart, you need to figure out if a rebuild is even worth it. Usually, CV joints fail because the rubber boot tears, the grease leaks out, and dirt gets in. If you caught the tear early and the joint is only making a tiny bit of noise—or none at all—you're a prime candidate for a rebuild. However, if your car sounds like a bag of hammers every time you turn the wheel, the metal surfaces inside the joint are likely pitted and toast. In that case, a rebuild won't help much, and you're better off just swapping the whole axle. But for those small tears and early clicks, let's get into the nitty-gritty.
Gathering your gear
You don't need a professional shop for this, but you do need a few specific things. Besides your standard socket set and a sturdy jack, you'll definitely want a big-ass breaker bar. Axle nuts are notoriously stubborn. You'll also need a CV boot kit, which usually comes with the rubber boot, two clamps, and a tube of that special high-moly grease.
Oh, and get a box of disposable gloves. Seriously. CV grease is a special kind of nightmare that stays on your skin for days. It's thick, black, and somehow ends up on your forehead even if you never touched your face.
Getting the axle out
First things first, you've got to get the axle out of the car. Pro tip: break the axle nut loose while the car is still on the ground. Use that breaker bar I mentioned. Once that's loose, jack up the car, take the wheel off, and start disconnecting the bits that are in your way. Usually, this means popping the lower ball joint or removing a few strut bolts so you can pull the steering knuckle toward you.
Once the knuckle is out of the way, you can slide the splined end of the axle out of the hub. Now, you just have to pop the inner end out of the transmission. A pry bar usually does the trick here, but be gentle—you don't want to butcher the transmission seal.
The messy part: Disassembly
Now that you've got the axle on your workbench, it's time to see how to rebuild cv joint internals properly. Cut those old boot clamps off with some side cutters and slide the old, torn boot down the shaft. You'll see a giant glob of black goo. Wipe away enough grease so you can actually see what's going on.
Most outer CV joints are held on by a hidden snap ring or a circlip. You might need to give the inner race of the joint a solid whack with a brass drift or a rubber mallet to pop it off the shaft. Don't hit the cage or the balls directly, or you'll dent them. Once it's off, the joint will usually come apart. Be careful not to let the steel balls roll across the floor and disappear under your toolbox.
Cleaning and inspecting
This is where most people get lazy, but it's the most important part. You have to get every single speck of old grease and grit out of there. Dunk the parts in a parts washer or use a bunch of brake cleaner and rags. You want that metal shining like a new dime.
Once it's clean, look at the "races"—the grooves where the balls ride. If you see deep grooves, heat discoloration (blue/purple metal), or actual chunks missing, the joint is dead. If it looks smooth and clean, you're good to go. This thorough cleaning is the secret to a successful rebuild because even a tiny bit of leftover sand will act like sandpaper and ruin your new grease in a week.
Reassembling the joint
Slide your new boot onto the axle shaft first. Don't forget this, or you'll be taking everything apart again in ten minutes, feeling very frustrated. Now, put the joint back together. If you took the balls out, pop them back into the cage.
Take that tube of grease that came in your kit. Snip the corner and squeeze about half of it directly into the center of the joint. Use your thumb to pack it down in there, making sure it works its way behind the balls and into the crevices. It's exactly like packing a wheel bearing. Put the rest of the grease inside the boot itself.
Putting it all back together
Slide the joint back onto the axle splines until you hear or feel that snap ring click into place. Give it a good tug to make sure it's not going anywhere. Now, slide the boot over the joint. You might need to use a small screwdriver to help the lip of the boot seat into the groove on the joint housing, but be careful not to poke a hole in your brand-new rubber.
The clamps can be a bit of a pain. Some kits come with "pinch" style clamps that require a specific tool, while others use a "wrap-around" style. Whatever you have, make sure they are tight. If grease can leak out, water can get in, and you'll be doing this whole job over again by next month.
Sliding the axle back in
Getting the axle back into the transmission can be a little finicky. You have to line up the splines perfectly. Sometimes a little wiggle and a firm push are all it takes. Once the inner end is seated, swing your steering knuckle back into place and slide the outer splines into the hub.
Reattach your ball joint or strut bolts, put the axle nut on, and torque it down to the manufacturer's specs. Don't just "guess" here—the axle nut tension is what keeps your wheel bearing from falling apart. Usually, it's a pretty high torque value, so you'll need that big torque wrench.
Final checks
Before you put the wheel back on and head out, give everything a once-over. Are the boot clamps secure? Did you tighten the ball joint? Once you're satisfied, put the car back on the ground and take it for a slow test drive. Find a parking lot and do some tight circles in both directions. If the clicking is gone and everything feels smooth, you've successfully figured out how to rebuild cv joint parts without spending a fortune at the mechanic.
It's a dirty job, and your driveway might have a few black grease stains on it now, but there's a certain satisfaction in fixing a drivetrain component yourself. Plus, you probably saved yourself about $200-$400 in labor and parts markup. Just remember to keep an eye on those boots during your regular oil changes; catching a small tear early is the difference between a cheap 30-minute boot swap and a full afternoon rebuild!