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 Fixed Yoke Kit / Slip yoke Eliminator |
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Slip yoke eliminator
New Process 231 & 241 cases almost always come from the factory with a slip-yoke rear output. As the suspension in the vehicle moves up and down, the driveline needs to become shorter and longer to accommodate this. The low cost way to do this is to use a "slip yoke" on the rear of the transfer case. This slip yoke can "slip" or slide in and out of the rear of the case allowing for changein in driveline position. A slip yoke works fine when driveline angles are minimal: The pressure on the slip yoke is more or less straight in and out. However, when driveline angles exceed stock, the slip yoke then tries to operate at an angle: When the rear axle bumps up going over a bump, the force pushing on the slip yoke is at an angle, and tends to bind. This angular stress can cause the transfer case housing to crack. Any time a driveline gets much of any angle on it, you want to get rid of that slip yoke. It saved the factory a few bucks, but is no good for lifted 4x4s. (you will also need to modify or change the driveshaft to a unit that has a slip joint in it: That length change when the axle goes up and down has gotta go somewhere!)
Note: Many of these cases come with a 27 spline output shaft. It is also better to upgrade to a 32 spline output shaft when doing slip yoke conversion. The factory 27 spline shaft will work, but is marginal in strength. High Impact always uses 32 spline mainshaft when doing this conversion.