Best CV Axles & Boot Kits
New and remanufactured CV axles from OE suppliers to budget lines.
CV Axle Fundamentals
Constant velocity (CV) axles transfer power from the transmission or transfer case to the front wheels on front-wheel-drive and all-wheel-drive vehicles, and to the rear wheels on independent-rear-suspension vehicles. Each axle has two CV joints — an inner joint that accommodates plunge (in-and-out movement as the suspension travels) and an outer joint that accommodates the steering angle. Both joints are packed with grease and sealed by a rubber or thermoplastic boot. When a boot tears, the grease escapes and road contamination enters the joint, destroying the precision-machined bearing surfaces within weeks to months.
The classic symptom of a worn outer CV joint is a clicking or popping noise during tight turns — the noise is most apparent during slow-speed parking-lot maneuvers at full lock. Inner CV joint wear produces a vibration or shudder during acceleration, particularly noticeable when accelerating from a stop. These symptoms are distinct and diagnostic — hearing one of these patterns on your vehicle means the corresponding joint has developed enough play to produce the noise, and replacement is the correct repair. CV joints are not serviceable once they have developed play — the bearing surfaces are damaged and cannot be restored by repacking with fresh grease.
Top Picks
GKN/Löbro (OE Supplier)
GKN is the world's largest CV joint manufacturer and supplies OE axles for the majority of European, Japanese, and Korean vehicles. Their aftermarket line uses the same joint designs and boot materials as the OE units. Premium pricing but the closest match to factory specifications available.
Cardone 66-Series (New, Not Reman)
Cardone's new-manufacture CV axle line — not their remanufactured line — provides a mid-tier option with new joints, new boots, and new ABS tone rings. The distinction matters: Cardone also sells remanufactured axles under different part number series that reuse the original housing and re-machine the bearing surfaces.
TRQ (Online Direct)
TRQ manufactures new CV axles and sells direct through online retailers. Their pricing is typically 30 to 50 percent below name-brand equivalents. Build quality has improved significantly in recent years — customer satisfaction data shows acceptable longevity for daily-driver applications. Includes new boots, joints, and ABS rings.
New vs Remanufactured Axles
Remanufactured CV axles reuse the original shaft and housing — the joints are disassembled, inspected, re-machined if necessary, packed with fresh grease, and fitted with new boots. The quality of the remanufactured product depends entirely on the rebuilder's standards. Name-brand remanufactured axles from suppliers like Cardone's reman line are inspected and tested to published standards. Off-brand remanufactured axles from unknown sources may use worn joints that are merely cleaned and repacked — not actually rebuilt. These economy-reman axles have the highest failure rate of any CV axle category.
New-manufacture aftermarket axles use entirely new components — new shafts, new joints, new boots, new circlips. The joint precision may not match OE specifications on the least expensive new axles, but even a modest-quality new axle starts its service life with fresh, unworn bearing surfaces. For most applications, a new aftermarket axle in the mid-price range provides better long-term value than a remanufactured axle at a slightly lower price point. The exception is vehicles where the OE axle uses a unique joint design that aftermarket manufacturers have not replicated accurately — on these applications, an OE-spec remanufactured axle from a quality rebuilder may outperform a new aftermarket axle with a generic joint design.
Boot Replacement vs Full Axle
If a CV boot has recently torn but the joint is still quiet and shows no play, boot replacement alone can save the joint. This requires removing the axle, disassembling the joint, cleaning out the old contaminated grease, inspecting the bearing surfaces for scoring, repacking with fresh grease, and installing a new boot. The labor for this procedure is comparable to replacing the entire axle — which is why most repair shops recommend a complete axle replacement rather than a boot-only repair. The labor savings of a boot-only repair are minimal, and the risk of the joint failing shortly after the boot repair (because contamination has already initiated damage that was not visible during inspection) makes the full axle replacement the more reliable choice.
Split boots — clamshell boots that wrap around the shaft without requiring joint disassembly — are available for emergency repairs. They keep contamination out and grease in, but they do not allow joint inspection or repacking. A split boot is a temporary fix that buys time until a proper repair can be scheduled. They are not a permanent repair solution.
ABS Tone Ring Compatibility
Most replacement CV axles include an ABS tone ring — the toothed ring that the wheel speed sensor reads to provide data to the antilock braking and traction control systems. The tone ring must have the correct number of teeth, the correct diameter, and the correct mounting position for the ABS system to function. An aftermarket axle with a mismatched tone ring can trigger ABS and traction control warning lights, disable stability control, and cause erratic braking behavior. Verify the tone ring specification before installation — count the teeth on the old axle and compare to the new one. This is the single most common source of post-installation ABS faults on aftermarket CV axles.
Some vehicles use an integral tone ring — the teeth are machined directly into the axle shaft or the outer CV joint housing. Others use a press-fit tone ring that can be transferred from the old axle to the new one if the replacement axle does not include the correct ring. Transferring a press-fit ring requires care — the ring must be pressed off the old axle without deforming the teeth and pressed onto the new axle at the correct position. A deformed or misaligned ring produces erratic ABS sensor readings that are difficult to diagnose.
Torque Specifications
The axle nut — the large nut at the hub center that retains the outer CV joint in the wheel bearing — is a critical fastener. Under-torqued axle nuts allow the axle to move in and out of the bearing, causing clicking noises, bearing damage, and eventual axle separation. Over-torqued axle nuts preload the wheel bearing and shorten its life. The correct torque specification varies by vehicle — typically 150 to 250 ft-lbs — and must be applied with a torque wrench, not an impact gun. Many axle nuts are single-use — they deform during torquing to provide a locking function, and reusing them risks the nut loosening during driving. Check whether your application requires a new axle nut with each axle replacement.
CV axle removal and installation requires removing the wheel, brake caliper (and hanging it with wire — never let it hang by the brake hose), and disconnecting the lower ball joint or strut bolts to swing the knuckle outward enough to pull the axle from the hub bearing. The inner end of the axle is retained in the transmission by a circlip — a spring clip that snaps into a groove inside the differential. Pulling the axle from the transmission requires a sharp outward tug to pop the circlip past the retention groove. If the axle will not pull free, a pry bar against the inner CV joint housing (not the shaft) provides the leverage needed. On some vehicles, the inner axle is retained by a bracket bolted to the transmission — remove the bracket bolts before attempting to pull the axle.
Transmission fluid will drain from the seal when the inner axle is pulled. Place a drain pan under the transmission before removal. After installing the new axle, check and top off the transmission fluid level — the amount lost varies from a few ounces to nearly a quart depending on the vehicle's axle seal location and the angle at which the vehicle is supported. Forgetting to check fluid level after a CV axle replacement risks running the transmission low on fluid, which causes wear and overheating that may not become apparent for thousands of miles.
Frequently Asked Questions
How long do CV axles last?
OE CV axles last 100,000 to 200,000 miles with intact boots. Aftermarket replacements vary — quality new-manufacture axles last 60,000 to 100,000 miles; economy remanufactured axles may last as little as 20,000 to 40,000 miles.
Can a bad CV axle cause vibration at highway speed?
Yes. A worn inner CV joint causes a vibration during acceleration that is often mistaken for tire or wheel balance issues. The vibration is speed-dependent and increases under load.
Do I need to replace CV axles in pairs?
Not necessarily. CV axles fail individually based on boot condition and driving patterns. Replace the axle that is clicking or has a torn boot. Replace both if both boots are torn or both joints are noisy.