Yukon Gear Seal Housing For Dana 30 / Model 35 Zip Locker
If the Yukon Zip Locker in your Jeep Cherokee XJ, Wrangler YJ or TJ, Grand Cherokee ZJ or Comanche has started leaking air, will not lock, or your compressor keeps cycling with the switch on, the seal housing is the first part to suspect. Yukon YZLASH-02 is the replacement seal housing, supplied with its O-rings, for Zip Lockers in the Dana 30 front axle and the Model 35 rear. It is a service part for a locker that is already installed, not a locker on its own.
A Zip Locker runs open until you send it air. Pressure from the compressor travels through a line to a bulkhead fitting in the axle housing, and from there into the seal housing inside the center section. The seal housing does not turn; the locker carrier spins inside it. O-rings seal the gap between the stationary housing and the rotating carrier so that air can pass into the carrier and push the locking piston, which ties the side gear to the case and locks both axle shafts together. Let off the air and a spring returns the locker to open. Every time you lock up, those O-rings are sealing against a moving surface, so they wear, and the housing itself can be scored by dirt or metal in the gear oil.
For the other wear points in these axles, see our Dana 30 front axle problems guide and the Dana 35 rear axle guide.
Start outside the axle. Disconnect the line at the bulkhead, cap it, and pressurize the system: if pressure holds, the compressor, solenoid and line are fine. Then reconnect and spray soapy water on every fitting. If nothing bubbles outside but the system still loses pressure with the locker engaged, the leak is at the seal housing O-rings. Pull the cover and look for a cracked or scored housing, or a carrier bearing that has worn enough to let the carrier wobble, which chews O-rings fast. Our open vs limited slip vs locker guide explains how selectable lockers like this one work. If the side bearings are rough, plan on a Dana 30 front master bearing kit during the same teardown.
YZLASH-02 is cataloged for the Yukon Zip Locker in the Dana Spicer 30 and the Model 35. Vehicle listings for this part include the 1984-2001 Jeep Cherokee, 1986-1992 Comanche, 1987-1995 and 1997-2006 Wrangler, 1993-1998 Grand Cherokee, 1974-1983 CJ5, and a range of AMC cars including the Eagle, Hornet, Javelin, AMX and Pacer. Those are vehicle-level listings: it only fits if that axle has a Yukon Zip Locker in it, not an ARB, an Eaton E-Locker or an open carrier. Dana 44 and Dana 60 Zip Lockers use different seal housings (YZLASH-03 and YZLASH-04), so check which locker and axle you have, or send us the locker part number, year and VIN before ordering. More axle service parts are in our hard parts section.
| Brand | Yukon Gear & Axle |
| Part number | YZLASH-02 |
| Fits | Yukon Gear Seal Housing For Dana 30 / Model 35 Zip Locker |
| Type | Differential Seal Kits |
| Condition | New |
| Ships | Same business day (in stock), from the USA |
| Warranty | 1-year |
Doing this repair right usually means replacing these at the same time. Same transmission, ships together.
No. YZLASH-02 is only the seal housing and its O-rings. It replaces a worn or damaged housing on a Yukon Zip Locker that is already in a Dana 30 or Model 35 axle.
No. ARB and Yukon use different seal housing designs. This housing is for the Yukon Zip Locker only.
No. Yukon lists separate seal housings for those axles, YZLASH-03 for the Dana 44 and YZLASH-04 for the Dana 60. YZLASH-02 is the Dana 30 and Model 35 version.
Cap the line at the bulkhead and pressurize the system. If it holds, the outside parts are good. If it only loses pressure when connected to the axle and no fitting bubbles with soapy water, the leak is inside at the seal housing.
Keep the original shims on the same sides and you will normally end up where you started, but always check backlash and the contact pattern before refilling, especially if a side bearing was replaced.
