Overview
The Trail Gear 144040-KIT is a billet aluminum seal housing kit for Trail Gear’s 9 in. axle housing, with three outer O-rings and a double seal on the inside.
The three outer O-rings seal the housing against the axle tube, so fluid cannot leak between the tube and the housing. The seals are built to hold during rock crawling and high-speed driving. The seal housing keeps differential fluid inside the differential, away from the brakes and tires.
Key features
- Machined from billet aluminum
- Three O-rings on the outer surface of the seal housing
- Double seal on the inside of the housing
- Tapered inner bore that lines up the axle shaft during installation
- Set screw holds the seal housing in place
Axle seal care and wear
Axle seals work hard on trails. Water crossings, mud and grit can push contaminants toward the seal lips, and a worn seal lets gear oil escape while dirt gets in. Inspect the seal area after heavy-use trips, looking for seepage around the axle tube, an oil film on the brake side, or dried residue near the housing.
Gear oil level matters too, since a low level makes the seals run hotter. If the housing seals are replaced, consider the axle bearings and the axle shaft seal at the same time, because they are exposed to the same fluid. Clean the axle tube surface before fitting the outer O-rings, since grit trapped under them can prevent a clean seal.
- Seepage around the axle tube
- Oil film on brake components
- Residue near the set screw
Specifications
| Brand | Trail Gear |
|---|---|
| Part number | 144040-KIT |
| UPC | 70000621348 |
| Material | Billet aluminum |
| Outer seals | Three O-rings |
| Inner seals | Double seal |
| Bore | Tapered on the inside |
| Retention | Set screw |
| Housing size | 9 in. (per the title) |
Vehicle fitment
It is a 9 in. seal housing kit. Confirm fit for your vehicle’s year, model and trim before ordering.
Measure your axle housing and confirm it matches the 9 in. size before installation.
Compare the housing size and bore with your axle before ordering.
Confirm your vehicle’s year, model and trim before ordering.
Installation notes
The tapered inside of the seal housing lines up the axle shaft during installation, which helps protect the seals and housing. Keep the set screw tight so the housing cannot move when the shafts go in.
What’s included
One seal housing with its three O-rings and double seal is included. Check the package contents against your installation before starting.
