Overview
The Crown Automotive J8134490 is a rear mainshaft bushing for NP231 and NP242 transfer cases. It supports the rear end of the transfer case mainshaft, so the transfer case model is the main fitment check for this part.
Crown Automotive is a Jeep replacement parts maker and distributor with more than 8,000 part numbers, including many factory-discontinued items. This bushing is one of those replacement parts for the NP231 and NP242.
Key features
- Rear mainshaft bushing design
- Named for NP231 and NP242 transfer cases
- It is a Direct Fit replacement.
- Identified by part number J8134490 and UPC 848399072402
Checking the mainshaft bushing
A rear mainshaft bushing supports the back end of the mainshaft as it turns inside the transfer case. When it wears, the shaft can move off its centerline, which shows up as whining, gear noise under load or play at the shaft end. Because the bushing sits between moving parts, small wear can spread to nearby gears if it is left in service.
Before buying a replacement, inspect the mainshaft journal where the bushing rides. A worn journal can wear a new bushing quickly, so measure the surface or have it checked while the case is open. Use a transfer case fluid that suits your unit and keep the case at the correct level, since low fluid speeds up wear on bushings and gears alike.
- Check the mainshaft journal for grooves or scoring
- Inspect nearby gears and bearings when the case is open
- Keep fluid at the correct level after the repair
Specifications
| Brand | Crown Automotive |
|---|---|
| Part number | J8134490 |
| UPC | 848399072402 |
| Component | Rear mainshaft bushing |
| Transfer case compatibility | NP231 and NP242 |
| Fitment type | Direct Fit |
Vehicle fitment
It is made for NP231 and NP242 transfer cases. Confirm fit for your vehicle’s year, model and trim before ordering.
Confirm your vehicle’s year, model and trim before ordering.
What’s included
The rear mainshaft bushing, part number J8134490. Check the package contents against your installation before starting.
