Overview
The G2 Axle and Gear NP231 slip yoke eliminator kit, part G/237-231SYE, replaces the standard slip yoke on a Jeep NP231 transfer case with a fixed yoke output. The fixed output accepts a longer drive shaft.
This G2 version is a heavy-duty replacement for that job.
Key features
- Replaces the slip yoke with a fixed output on the NP231
- Uses a 1310 CV style replacement yoke
- Includes a new output shaft (tail shaft)
- Includes a new extension housing
- Built as a heavy-duty replacement for the standard slip yoke
Driveline angles and balance
A fixed yoke changes how the drive shaft works at the transfer case. Without a sliding joint, the shaft length and the driveline angles must stay within tolerance as the suspension moves, so the setup needs more care than a stock slip yoke layout. Checking the angle with the vehicle at ride height helps catch problems early.
The shaft balance matters when the length changes. A shaft that is cut or modified should be balanced again, since even a small imbalance can cause vibration at highway speed. Keep the new output seal clean and check for leaks at each oil change, because the extension housing is an area where fluid can seep.
- Measure driveline angles at ride height
- Balance any modified drive shaft after the change
- Check transfer case fluid level after install
Specifications
| Brand | G2 Axle and Gear |
|---|---|
| Part number | G/237-231SYE |
| Transfer case model | NP231 |
| Replacement yoke type | 1310 CV style yoke |
| Included shaft | New output shaft (tail shaft) |
| Included housing | New extension housing |
Vehicle fitment
The kit is written for the NP231 transfer case. Confirm the transfer case model and your vehicle’s year, model and trim before ordering.
Installation notes
Fitting a fixed output means the drive shaft length has to be matched to the new yoke, and the driveline angles should be checked afterward. Support the transfer case while the old housing is removed.
What’s included
A new output shaft and extension housing for the NP231 transfer case, with a 1310 CV style yoke.
Not included: the drive shaft, which is sold separately.
