CV Joint, 128mm Lightened 934 Porsche

OVERVIEW

When you''re pushing the limits of an off-road beast, every ounce of rotating mass matters, and that''s where the EMPI 128mm Lightened 934 Porsche CV Joint truly shines. Engineered for high-performance applications like sand rails, long-travel Baja Bugs, and heavy-duty off-road racers, this CV joint provides the massive strength of the 934 series while shedding unnecessary weight. By lightening the outer race, EMPI has reduced the parasitic drag on your drivetrain, allowing your engine to rev faster and deliver power to the ground more efficiently. It''s the same principle as lightening a flywheelless mass to spin up means quicker acceleration out of the turns and over the dunes. Don''t settle for standard joints when you can have the competitive edge of a lightened, race-ready component that handles extreme angles without breaking a sweat.

Construction quality is paramount in a component that faces the brutal torque of a high-horsepower air-cooled engine or a modern water-cooled conversion. These 934 CV joints feature high-strength chromoly cages and hardened alloy inner and outer races that have been precision machined and ground to exacting tolerances. Each unit is hand-inspected to ensure that the 1.000-inch balls move through their tracks with zero binding, even at the steep operating angles common in long-travel suspension setups. Whether you are running a Mendeola, a built Bus box, or a custom Weddle transaxle, these joints offer the reliability you need to stay on the trail. Appletree Auto stocks these because we know that off-roaders demand parts that can withstand the heat, friction, and impact of the desert, and EMPI''s commitment to quality materials ensures these joints are up to the task.

FITMENT

• Custom Off-Road Sand Rails: Designed for high-performance chassis.
• Long-Travel Baja Bugs: Ideal for rear suspension setups requiring high angularity.
• Dune Buggies: Perfect for high-horsepower builds using 934-style drive flanges.
• Transaxles: Compatible with Mendeola (MD4-2D, S4, S5), Weddle, and Albins units with 934 flanges.
• Axles: Fits all standard 33-spline high-strength off-road axles.
• Porsche 934 Conversion: Direct replacement or upgrade for 128mm 934-style applications.

SPECS

• Outer Diameter: 128mm (934 Porsche Standard).
• Spline Count: 33-Spline Inner Race.
• Ball Bearing Size: 1.000-Inch Diameter.
• Cage Material: High-Strength Chromoly Steel.
• Race Material: Hardened Alloy Steel, Precision Ground.
• Design: Lightened Outer Race for reduced rotating mass.
• Part Number: 98-5096-B.
• Weight: Approximately 5.9 lbs.

PRO TIPS

1. Master the Grease Packing Technique

Proper grease packing is the single most important step for CV joint longevity. Use a high-quality molybdenum disulfide (moly) grease specifically designed for high-impact CV applications. You must "work" the grease into the cage and around every ball before installation. Don''t just put a glob in the boot; the joint itself must be fully saturated to prevent metal-on-metal contact during the first few rotations. A properly packed joint should have grease forced through the center until it oozes out of the ball tracks on the opposite side.

2. Check Your Suspension Geometry for Binding

Always check for "binding" at full suspension droop and full compression. While 934 joints allow for impressive angularity, if the axle is too long or too short, it can bottom out inside the joint or pull the cage too far, leading to catastrophic failure. Rotate the tires by hand while the vehicle is on jack stands to ensure smooth operation