driveline angles 91 wrangler SOA

With the factory driveshaft, the transfer case output shaft angle and rear axle's pinion shaft angle must be exactly the same, +/1 a degree or so. In other words, they must be parallel to each other. They must be the same or they will accelerate in and out of position at different speeds from each other which is what causes driveshaft vibration which ultimately causes failed seals and bearings in the drivetrain.

Only when the driveshaft is an aftermarket CV driveshaft can the rear pinion shaft be raised up... it needs to be pointed directly up and in line with the driveshaft. Technically, with a leaf-spring vehicle, the rear pinion angle should be 2-3 degrees under that of the driveshaft to counteract the effects of axlewrap. :)

Jerry

With the factory driveshaft, the transfer case output shaft angle and rear axle's pinion shaft angle must be exactly the same, +/- a degree or so. In other words, they must be parallel to each other. They must be the same or they will accelerate in and out of position at different speeds from each other which is what causes driveshaft vibration which ultimately causes failed seals and bearings in the drivetrain.

Only when the driveshaft is an aftermarket CV driveshaft can the rear pinion shaft be raised up... it needs to be pointed directly up and in line with the driveshaft. Technically, with a leaf-spring vehicle, the rear pinion angle should be 2-3 degrees under that of the driveshaft to counteract the effects of axlewrap. :)

Jerry

If you intend to WHEEL this Jeep you will need the CV and slip Yoke eliminator, save yourself some time and money and do it right. The SYE is available from many sources including Advance Adapters, Rubicon Express to name a few. I have used Tom Woods driveshaft for several years and they are great to work with, they also sell a good SYE. All of these places can be found with simple internet searches. Shoot me an e-mail off list if you need help locating them.