NP231-SYE : New Process 231J Fixed Yoke Kit (50-7906 , 50-7907) (#NP231-SYE)

Starting at: $219.88

Advance Adapter

This Heavy Duty Slip Yoke eliminator kit fits Jeep NP231 transfer cases. This kit features a new 1 3/8" spline rear output shaft, 356-T6 heat treated aluminum alloy tailhousing, 1310 c.v. yoke 1310CV Yoke AA compaired to Stock (other styles of yokes available), bearings, fastening hardware, and detailed instructions.

Beware of Imitations

Use the photos below to determine if your kit is manufactured by Advance Adapters or not.

Note: We have designed our heavy duty fixed yoke output shaft with the most current design shaft found in the New Process Gear NP231. This current design shaft was introduced in 1997. Jeep vehicles using the early NP231 can still use our kit, providing that the needle bearings are removed from the stock drive sprockets.

Transfer Case

Introduced in 1988, the Jeep NP231 is a part-time transfer case became the standard for XJ and YJ models. It was also used in six cylinder ZJ models through 1995. Chain driven with a 2.72:1 low range, it's reliable even with more than stock horsepower applied.


We are proud to offer Tom Wood's Drive Shaft's with our fixed yoke kit. Tom Wood's is one of a few companies that truly specialize in 4x4 drive shafts. Four Wheel Drive is all they do, they do it better.

* Free Shipping within the continental United States when you Combo Sye Kit with new Drive Shaft.

*This package was designed with the YJ, TJ, & XJ in mind. Other applications may incur addition costs due to cost of production.

Top Reviews


by john guio, from campbell, CA

awesome kit

After installing this kit my, vibrations went away.
I had a hack-b-tap with cv shaft driveline. Was fine on first trip
But then developed roam vibration.
I purchased AA sye kit and installed in a breeze. Drove on
The hwy and was so happy my vibrations were gone.
Thanks again.

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