Irs Cv Boot, for 934 Cv Joint, Over The CV Style, Each

OVERVIEW

When you are pushing the limits of your off-road machine, the last thing you want to worry about is a catastrophic failure in your drivetrain. The EMPI IRS CV Boot for 934 CV joints is the professional choice for enthusiasts who demand maximum protection for their high-performance Independent Rear Suspension setups. Designed specifically for the massive 128mm 934 CV joint, this boot is a critical component in safeguarding your expensive internal components from the brutal elements of the trail. Whether you are navigating deep silt beds in a Baja Bug or carving dunes in a high-horsepower sand rail, this boot provides a resilient barrier against sand, dirt, water, and abrasive grit that can turn your CV grease into a grinding paste and lead to premature joint failure.

What sets this particular model apart is the specialized "Over-The-CV" design. Unlike standard boots that may struggle with the extreme angles and rapid articulation found in long-travel off-road suspensions, this style stretches over the outer diameter of the CV joint itself to ensure a secure, airtight seal. This design is particularly favored by builders of heavy-duty rail buggies and custom off-road vehicles because it reduces the risk of the boot pulling off or tearing during full suspension droop. Manufactured from a high-grade, flexible neoprene compound, this boot is engineered to withstand the intense heat generated by high-speed CV rotation while maintaining the elasticity needed for 934-style travel. It''s not just a replacement part; it''s an insurance policy for your drivetrain that ensures your power reaches the dirt without interruption.

FITMENT

This high-performance CV boot is designed for custom and high-travel VW-based applications using the 934 series drivetrain. Specifically, it fits:

• Custom Sand Rails and Dune Buggies: Equipped with 934 (128mm) CV joint conversions.
• Baja Bugs: Utilizing high-travel long-arm IRS suspension systems.
• Off-Road Racing Vehicles: Class 1, Class 5, and Class 10 cars running 934 drivetrain components.
• Manx-Style Buggies: With upgraded heavy-duty transaxles and 934 drive flanges.
• Universal Off-Road Applications: Any vehicle utilizing a standard 934 CV joint requiring an over-the-joint style boot.

SPECS

• Manufacturer: EMPI
• Part Number: 86-9311-0
• CV Joint Compatibility: 934 Series (128mm / 5.04 inch Outside Diameter)
• Design Style: Over-The-CV (Fits over the outer housing of the joint)
• Material: Heavy-duty, high-flexibility Neoprene rubber
• Color: Black
• Inside Diameter (Small End): Optimized for standard off-road axle diameters
• Inside Diameter (Large End): Sized for a snug fit over 934 CV joint housings
• Quantity: Sold individually (Each)

PRO TIPS

1. Cleanliness is Key to Longevity

Before installing your new EMPI 934 boot, it is absolutely vital to thoroughly clean the outer surface of the CV joint housing. Since this is an "Over-The-CV" style boot, any leftover grease or oil on the outside of the joint can cause the boot to slip or spin under high torque, even with a clamp in place. Use a high-quality brake cleaner or degreaser to ensure the mounting surface is bone-dry. This creates the necessary friction for the boot to "bite" onto the joint, preventing it from sliding off during extreme suspension articulation or high-speed runs.

2. Don''t Over-Pack the Grease

While it is tempting to fill the entire boot with CV grease, this is a common mistake that can lead to premature failure. You only need to pack the CV joint itself and add a moderate amount inside the boot. If you over-fill the boot, the centrifugal force at high RPMs will cause the grease to expand and "balloon" the boot. This excess pressure can cause the boot to rub against nearby suspension components or even pop the boot off the flange. Always use a high-temperature Moly-based grease specifically formulated for the high-friction environment of a 934 joint.

3. Use Proper CV Boot Clamps

To ensure a professional-grade seal, avoid using standard worm-gear hose clamps or plastic zip ties. Standard hose clamps are often out of balance and can cause vibrations at high speeds, while zip ties lack the clamping force required to keep the boot secure under the heavy loads of an off-road drivetrain. We highly recommend using stainless steel Oetiker-style or keystone-style ear clamps. These provide a consistent, 360-degree seal that won''t loosen over time, ensuring your grease stays in and the trail debris stays out.