4X4 Posi-Lok PSL900 Kit:
4X4 Posi-Lok PSL900 Kit. Here's the kit you need to replace the failure prone original Jeep vacuum shift motor! Fits: 1986-91 MJ Comanche, 1984-91 XJ Cherokee, and 1987-95 YJ Wrangler. This 4x4 Posi-Lok replaces the vacuum or electric front axle engagement systems with a simple and easy to install driver-operated manual cable system. Now you can have 4WD when you want it - not just "sometimes it works"! Installation is moderate effort with common hand tools.