When upgrading your Jeep YJ or XJ from the factory two piece vacuum disconnect axle to an RCV Ultimate Dana 30 CV Axle Set, this block-off kit is required to complete the conversion. It eliminates the OEM disconnect housing, allowing the use of a stronger one piece inner axle shaft for better durability, smoother power delivery, and improved reliability on and off the trail.

The kit includes everything needed to properly seal the axle housing and remove the weak factory disconnect system.

Includes:

• Block-off plate
• Required seals
• Installation hardware
• Designed specifically for RCV 27 spline Dana 30 CV Axle conversions

Specifications

• Axle Model: Dana 30
• Spline Compatibility: 27 spline
• Application: Converts factory two-piece vacuum-disconnect to one-piece axle configuration
• Components Included: Seals + block-off plate
• Required For: RCV Ultimate Dana 30 CV Axle Set installation on YJ/XJ vacuum-disconnect axles

Fitment

• This kit is required when installing an RCV Ultimate Dana 30 CV Axle Set into:
• Jeep Wrangler YJ 19871995 (vacuum-disconnect Dana 30)
• Jeep Cherokee XJ 19841991 (vacuum-disconnect Dana 30)
• Only needed for Dana 30 axles originally equipped with the factory vacuum-disconnect system.

Tech Insight

Jeeps early Dana 30 vacuum disconnect axles use a weak two piece passenger side inner shaft. Converting to RCVs one piece CV axle dramatically improves strength, eliminates disconnect related failures, and delivers smoother engagement. The block-off kit seals the original disconnect housing and allows the updated one piece shaft to operate correctly.

Without this kit, the housing cannot be properly sealed and the RCV axle cannot be installed.