Type 2 091 To 930 Cv Drive Flanges, Sold As A Pair

OVERVIEW

When you''re pushing the limits of an air-cooled powerhouse, the weak link in the drivetrain is often the factory-spec CV joints, which were never intended to handle the massive torque of a modified engine or the vertical travel of a long-travel suspension. These EMPI Type 2 091 to 930 CV Drive Flanges are the ultimate solution for enthusiasts looking to adapt the legendary strength of 108mm Porsche 930 CV joints to the rugged 6-rib 091 transaxle. By upgrading to a 930-style CV joint, you significantly increase the maximum operating angle and the shear-strength capacity of your rear end. This makes these flanges an essential modification for high-performance sand rails, heavy-duty off-road racers, and extreme street-performance Volkswagens that require a bulletproof connection between the transaxle and the wheels. Whether you''re carving through deep dunes or launching at the drag strip, these flanges provide the structural integrity needed to ensure your power actually makes it to the ground without catastrophic failure.

Crafted from high-strength forged 4340 chromoly, these drive flanges are engineered to withstand the brutal radial loads and shock torque associated with high-horsepower air-cooled engines and oversized off-road tires. Unlike standard cast components that can fatigue and crack under stress, these heavy-duty units are precision-machined to ensure a perfect, slop-free fit onto your 091 output shafts. They come pre-tapped for 3/8-inch fine thread CV bolts, which is a preferred choice for many high-torque applications because the fine threads offer superior clamping force and resistance to vibration-induced loosening compared to standard coarse hardware. Sold as a pair, these flanges are a direct conversion component for your stock 091 transaxle, allowing for a seamless transition to a 930-style setup while maintaining the professional-grade reliability that Appletree Automotive customers demand for their custom builds.

FITMENT

• VW Type 2 Bus: 1976-1979 (Models equipped with the 091 6-Rib Transaxle).
• Custom Off-Road: Fits any custom Sand Rail, Dune Buggy, or Baja Bug utilizing a VW 091 6-Rib Transaxle.
• CV Joint Compatibility: Specifically designed for 108mm Porsche 930 Style CV Joints.
• Axle Requirements: Requires 930-style axles to match the flange and CV joint configuration.

SPECS

• Material: Forged 4340 Chromoly Steel for maximum torsional strength.
• Transmission Application: VW 091 (6-Rib) Bus Transaxle.
• CV Joint Pattern: 930 Porsche (108mm diameter).
• Bolt Hole Thread: 3/8"-24 Fine Thread (High-strength tapping).
• Quantity: Sold as a pair (2 pieces).
• Finish: Machined steel surface.
• Compatible Part Numbers: Uses 98-5140-B flange plugs (sold separately).
• Weight: Approximately 3.3 lbs per pair.

PRO TIPS

1. Use High-Quality 12-Point Hardware

Since these flanges are tapped for 3/8-inch fine thread bolts rather than the standard metric M10 hardware, it is critical to use high-grade (Grade 8 or equivalent) 12-point CV bolts. The 12-point head allows for a more secure grip and higher torque application in the tight confines of the 930 CV joint cage. Always check the bolt length to ensure that the threads fully engage the flange without protruding so far through the back that they interfere with the transaxle case or the internal seals. Using a high-quality thread-locking compound is also highly recommended to prevent the bolts from backing out during the extreme vibrations of off-road use.

2. Don''t Forget the Flange Plugs and Seals

When installing these 091 to 930 conversion flanges, you must use the correct flange plugs (Part Number 98-5140-B) to prevent transaxle fluid from leaking out through the center of the flange and contaminating your CV grease. A leak here can lead to premature CV joint failure due to grease thinning, as well as potential transaxle damage from low fluid levels. Before sliding the flanges onto the splined output shafts, inspect your transaxle output seals for any signs of wear or weeping. It is much easier to replace those seals now while the flanges are off than to have to tear the entire drivetrain down again later.

3. Proper Greasing and Heat Management

The 930 CV joint is capable of handling much higher angles than a standard Type 1 or Type 2 joint, but high angles generate significant heat. Always use a high-moly content CV grease designed specifically for high-performance applications. When assembling your CV joints to these new flanges, ensure the mating surfaces are clean and free of old grease to allow for a proper seal with the CV boot flange.