Dana 60/61 Rear Differential Master Overhaul Kit (ZK D60-R)

When a three-quarter or one-ton truck with a rear Dana 60 starts droning on the highway, growls only when the trailer is hooked up, or leaves a gear oil stain under the pinion, the fix that holds up is new bearings and a careful setup. The USA Standard Gear ZK D60-R is the master overhaul kit for rear Dana 60 and Dana 61 differentials. It is the box you open for a bearing job on worn factory gears, a regear, or a carrier or locker swap, and it uses Koyo carrier and pinion bearings.

What a master overhaul kit does in a rear Dana 60

The Dana 60 carries a 9.75-inch ring gear and a 1.625-inch pinion, which is why it lives under heavy-duty pickups and vans. The pinion is supported by an inner and an outer tapered roller bearing, with a shim behind the inner race that sets pinion depth. The carrier rides on two side bearings, and on the 60 the carrier is located and preloaded by shims behind those bearings rather than by threaded adjusters, so changing shims is how backlash gets set. The case has to be spread slightly to get the carrier in and out with that preload. When any of the four bearings wears, the gears lose their position under load, the contact pattern shifts toward the tooth edges and the noise starts, usually long before anything breaks.

USA Standard Gear lists the ZK D60-R contents as carrier bearings and races, pinion bearings and races, pinion seal, complete shim kit, ring gear bolts, pinion nut, crush sleeve, oil baffles and slingers, thread locker, marking compound with brush and a cover gasket. Gears, a carrier, axle shafts and wheel bearings are not included.

Symptoms of worn rear Dana 60 bearings or gears

• A howl at cruise that changes when you go from pulling to coasting
• A low rumble under heavy load or towing that a tire change does not cure
• Clunk or delay as slack is taken up when you engage drive or reverse
• Seepage at the pinion seal or cover, or a wet driveshaft and yoke
• Metal fragments in the drained oil, or a pinion yoke with up-and-down play

How to confirm before you order

With the rear wheels off the ground and the truck in neutral, rotate the driveshaft and listen and feel for roughness, then rock the pinion yoke to check for play. Pull the cover over a clean pan and look at the oil: a fine gray paste is normal wear, but chips or flakes point at a bearing or a tooth. Read the contact pattern with marking compound and measure backlash with a dial indicator before you take anything apart. If the teeth are damaged, add a gear set such as the Yukon Dana 60 4.56 ring and pinion to the order.

Fitment

The ZK D60-R fits standard-rotation rear Dana 60 and Dana 61 axles. A Dana 60 is identified by its 10-bolt asymmetrical cover and the 60 cast into the center section, and the axle tag on the tube shows the build date and the bill of materials number. Rear axles from different truck makers and years used different bearing and yoke combinations, so match the old bearing numbers, read that tag, or send us your year, VIN and the tag number before you order. A steer axle takes the ZK D60-F front Dana 60 kit, not this one. If you would rather run Timken bearings, compare the Yukon YK D60-R rear kit. Other axle and transmission kits are in rebuild kits and hard parts.

Install notes

• Mark the bearing caps before removal; they are matched to the housing and must go back on the same side and in the same direction.
• Spread the housing with a Dana 60 housing spreader to remove and install the carrier, and never spread it past the specified limit.
• Set pinion depth to the marking on the new or original pinion, then shim the carrier for backlash and preload and verify with the marking compound before buttoning up.
• Install the oil baffles and slingers from the kit in the positions the old ones came from; they control oil flow to the pinion bearings.
• Use thread locker on the ring gear bolts and torque them in a crossing pattern.
• Refill with 75W-90 or 75W-140 gear oil, following the axle and towing spec for your truck, and recheck the level after a short drive.

The kit ships fast from the USA as a single part number, so the job is not held up by one missing shim or seal.

Does the ZK D60-R fit a front Dana 60?

No. It is for standard-rotation rear Dana 60 and Dana 61 axles. Front Dana 60 steer axles use a different kit, the ZK D60-F.

Are ring and pinion gears included?

No. The kit has the bearings, races, shims, seal, crush sleeve, baffles, slingers, ring gear bolts, pinion nut and setup supplies. Buy a gear set separately if your teeth are damaged or you are changing ratio.

Do I need a case spreader?

Yes. The Dana 60 carrier is preloaded with shims, so the housing must be spread slightly with a spreader to remove and install the carrier without damaging the bearings or the case.

How do I confirm my rear axle is a Dana 60?

Look for the 10-bolt asymmetrical cover and a 60 cast into the center section, then read the axle tag on the tube. Send us the tag number or your year and VIN if you want us to check.

What gear oil should I use after the rebuild?

Use 75W-90 or 75W-140 gear oil as specified for your truck and towing use, filled to the bottom of the fill plug hole. Add friction modifier only if your limited slip calls for it.

Can I keep my original gears?

Yes, if the teeth are smooth and the pattern was good. Record backlash and the pattern before teardown and set the new bearings up to match.