Complete Koyo bearing, race, shim and seal kit to rebuild a Dana 30 front differential and set pinion depth and backlash correctly.
If the front axle on your Jeep CJ, Cherokee or other Dana 30 equipped 4x4 howls on decel, growls in 4WD, or weeps oil around the pinion, the bearings and seals are usually the first thing to go. This USA Standard Gear ZK D30-F master overhaul kit carries everything needed to set a standard-rotation Dana 30 front differential back up from scratch: Koyo carrier and pinion bearings with their races, a full shim assortment, the pinion seal and both inner axle seals, ring gear bolts and a new pinion nut. It is the right kit whether you are reusing a healthy ring and pinion or installing a new ratio after bigger tires.
The Dana 30 front differential holds the ring gear and carrier on two tapered carrier bearings that are preloaded by shims between the bearing and the case. The pinion rides on an inner and an outer tapered bearing, and the shim behind the inner pinion race sets how deep the pinion teeth sit in the ring gear. When those bearings wear, preload drops, the gears walk apart under load and the contact pattern moves off the center of the tooth. That is where the noise comes from, and it is why a master kit includes new shims instead of making you reuse the old pack. Fresh races, fresh bearings and the correct shims are what let you put the pattern back where it belongs.
Raise the front, unlock the hubs or disconnect the axle, and rotate the driveshaft by hand. Rough or notchy rotation, or play when you rock the pinion yoke up and down, means the pinion bearings are done. Pull the cover and check backlash with a dial indicator against the ring gear, then paint a few teeth with marking compound and look at the pattern. A pattern pushed hard to the face or flank, or backlash well outside spec, confirms the setup has moved. If you are also weighing a new ratio, our Dana 30 4.56 ring and pinion with install kit shows what a complete regear package includes. Our general gasket and seal materials guide also explains why old seals harden and leak after years of heat cycles.
The ZK D30-F is built for the standard-rotation Dana Spicer 30 front axle. The manufacturer lists it for the 1976-1987 Jeep CJ7 with the 02820/02872 outer pinion bearing, and the same axle family appears under many older Jeep and light-truck front ends. Two Dana 30 variants need a different kit: the short-pinion version used in later TJ and XJ axles, which takes our ZK D30-TJ short pinion master kit, and the 2007-up JK reverse-rotation front. Before ordering, read the axle tag and, if the pinion is already out, the number on the outer pinion bearing. When in doubt, send us your year and VIN. You can browse other axle and rebuild parts under rebuild kits.
| Part Number | |
| OEM Part Number | |
| Brand | |
| Position | |
| Bearings | |
| Item Weight | |
| Package Dimensions | |
| Fitment |
No. The 2007-up JK front is a reverse-rotation Dana 30 with its own bearing sizes and needs the JK-specific master kit. The ZK D30-F is for the standard-rotation Dana 30 front.
No. This version is listed without the crush sleeve, so pick one up separately or use a solid spacer kit if you prefer a fixed preload setup.
Yes, if the teeth are not pitted, chipped or scored. The kit replaces the bearings, races, shims and seals around the gears. Mark the original pattern before teardown so you have a reference.
Use 75W-90 gear oil. Open carriers need nothing else; a limited slip carrier may need friction modifier, so check what your carrier requires.
The short-pinion axle uses a smaller outer pinion bearing. This kit is listed for the 02820/02872 outer pinion bearing; if yours is different, you likely need the ZK D30-TJ short pinion kit.
