If you've spent any time driving an AP1 or AP2 hard, you probably already know that s2000 axles can be a bit of a weak point in an otherwise bulletproof car. Honda did a lot of things right with the S2000—the high-revving F-series engine and that crisp-shifting transmission are legendary—but the rear driveline has some quirks that every owner eventually has to face. Whether you're dealing with a weird vibration during acceleration or you're worried about snapping a shaft at the drag strip, understanding how these axles work is pretty essential.
That Annoying Rear-End Vibration
We've all been there. You're merging onto the highway, you give it some gas in third or fourth gear, and suddenly the whole car feels like it's trying to shake itself apart. It's not a steering wheel shake like you'd get from an unbalanced tire; it's a distinct side-to-side shimmy coming from the rear. Most of the time, this "S2000 shake" is caused by the inner CV joints on your s2000 axles getting worn down.
Inside those inner CV "buckets," there's a tripod bearing that slides back and forth as the suspension moves. Over tens of thousands of miles, those bearings start to wear tiny little pits into the metal surface of the bucket. Once those pits are deep enough, the bearing gets "caught" during acceleration, and that's where the vibration comes from. It's a classic Honda problem, but on the S2000, it feels way more pronounced because you're sitting right on top of the rear subframe.
Why Lowering Your Car Makes it Worse
If you just installed a shiny new set of coilovers and suddenly your vibration got ten times worse, don't panic—you didn't necessarily break anything. When you lower an S2000, you're changing the resting angle of the s2000 axles. This forces the tripod bearing to sit in a different spot inside the CV bucket.
If your car was at stock height for 80,000 miles, the bearings already wore a "groove" into one spot. When you drop the car two inches, those bearings are now constantly trying to climb in and out of that old groove. This is why a car that felt perfectly smooth yesterday can suddenly feel like a vibrating mess the second it's lowered. It's a total headache, but luckily, there are a few ways to fix it without spending a fortune.
The Magic of Axle Spacers
One of the most popular "hacks" in the S2000 community is the use of axle spacers. These are basically just two-piece metal blocks that sit between the inner CV joint and the differential flange. By adding about 10mm to 15mm of thickness, you're essentially "pulling" the axle further out of the transmission.
This moves the tripod bearing to a fresh, un-pitted surface inside the bucket. It's a clever, relatively cheap fix that can buy you another few years of life out of your stock s2000 axles. Most people go with the two-piece designs because you don't even have to take the whole axle out to install them; you just unbolt the flange, slip them in, and bolt them back down with longer hardware. It's a weekend project that actually works.
Swapping the Inner Buckets
If you're a bit more of a "DIY on a budget" type of person, there's another trick called the "bucket swap." Since the wear inside the CV bucket only happens on one side (the side that handles forward acceleration), the other side of the bucket is usually brand new.
By taking your s2000 axles off the car, opening up the boots, and swapping the left inner bucket to the right side (and vice versa), you're exposing the bearings to a completely fresh, smooth surface. It's a messy job—expect to be covered in stinky, gray CV grease for a few hours—but it effectively resets the clock on your axles for the price of some new grease and a few zip ties or clamps. Just make sure you use high-quality, high-temp CV grease, or you'll be doing the job all over again in six months.
When It's Time to Go Aftermarket
At some point, the "fixes" aren't going to cut it anymore. Maybe the boots are torn, the splines are looking rough, or you're just tired of dealing with 20-year-old parts. When looking for replacement s2000 axles, you've got a few tiers to choose from.
OEM Replacements
If you can find them and afford them, brand-new OEM Honda axles are usually the best for a daily driver. They're balanced perfectly and built to last another 100k miles. The problem? They're getting harder to find and they aren't exactly cheap.
Budget Store Brands
You might be tempted to grab a pair of $80 axles from the local auto parts store. Honestly? Be careful. While they'll get you back on the road, many S2000 owners find that budget aftermarket axles can actually cause vibrations right out of the box because they aren't balanced as precisely as the factory units. They're fine in a pinch, but they aren't a performance upgrade.
Heavy-Duty Performance Axles
If you're running a turbocharger or a supercharger and pushing 400+ horsepower, you're in a different league. Stock s2000 axles are pretty tough, but they aren't indestructible, especially if you like to do hard launches on sticky tires. Companies like The Driveshaft Shop (DSS) make heavy-duty axles that can handle 500, 600, or even 1000 horsepower. These usually feature better alloys, beefier cages, and high-strength CV joints that won't snap the second you drop the clutch at 7,000 RPM.
Maintenance and Keeping Them Healthy
The best way to avoid buying new s2000 axles is to keep an eye on those rubber boots. As soon as a boot tears, grease starts flying out and road grit starts getting in. Once dirt gets into those bearings, it acts like sandpaper, and the axle is basically on a fast track to the garbage can.
Every time you change your oil, take a quick peek under the rear of the car. If you see a "ring" of grease splattered all over the inside of your wheels or the subframe, you've got a torn boot. Replacing a boot is annoying, but it's way cheaper than replacing a whole axle.
A quick tip: If you're tracking your car, the heat from the exhaust can sometimes cook the grease in the inner CV joint on the passenger side because it sits so close to the piping. Some guys run a small heat shield there just to keep the temperatures down and prevent the grease from breaking down prematurely.
The Bottom Line
Dealing with s2000 axles is just part of the "S2000 experience." It's a small price to pay for driving one of the best-handling cars ever made. Whether you choose to do the bucket swap, throw on some spacers, or go full-blown heavy-duty aftermarket, just remember that the vibration isn't going to fix itself.
If you start feeling that shimmy, address it sooner rather than later. Not only will the car feel a million times better, but you'll also be saving your differential and wheel bearings from unnecessary stress. Keep those boots intact, keep the grease fresh, and your S2000 will keep putting a smile on your face every time you hit VTEC.