Overview
The Omix-ADA Rear Extension Housing, part number 18676.25, is a rear extension housing for NP231 and NP242 transfer cases. Omix-ADA builds it as a direct OE replacement, to the original specifications, for Jeep applications.
Rear extension housings sit at the back of the transfer case, around the output shaft. Match the NP231 or NP242 case in your Jeep before ordering.
Key features
- Rear extension housing for NP231 and NP242 transfer cases
- Direct OE replacement design, built to original specifications
- Covered by a limited five year warranty from Omix-ADA.
- Part of Omix-ADA’s line of Jeep parts and accessories
Output shaft and housing care
The rear extension housing carries the transfer case output shaft and its seal, so it is exposed to fluid pressure and road debris. Look for seepage around the mating surfaces and the output seal, and for play in the output shaft. Leaks at the housing often start as slow weeps that get worse over time.
When the housing is off, check the output bearing and the front case mating face as well. Clean old sealant from the surfaces before fitting a new gasket, and use a sealant type that suits your case. Driveline vibration that increases with speed can point to bearing or output problems, so check them before reinstalling. Keep the bolts tightened to the case’s required values after the first few drives.
- Check for oil seepage at the housing face
- Feel for play in the output shaft
- Inspect the output seal before reinstalling
Specifications
| Brand | Omix-ADA |
|---|---|
| Part number | 18676.25 |
| UPC | 804314061944 |
| Part type | Rear extension housing |
| Transfer cases | NP231 and NP242 |
| Warranty | Limited five year warranty from Omix-ADA. |
Vehicle fitment
Confirm fit for your transfer case and your vehicle’s year, model and trim before ordering. It is matched to the NP231 and NP242 transfer cases only.
Confirm your vehicle’s year, model and trim before ordering.
Installation notes
Removing the housing means opening the back of the transfer case, so work with the vehicle supported on jack stands and use a shop familiar with NP231 and NP242 cases if needed.
What’s included
Check the package contents against your installation before starting.
Not included: Nothing beyond the housing is described, so gaskets, seals and hardware should be confirmed before installing.
