USA Standard Master Overhaul Kit For The Dana 44 Disconnect Front

If your 1994 to 2001 Dodge Ram 1500 4x4 hums from the front end, leaks gear oil at the pinion or out of the axle tube, or makes noise only when four-wheel drive is engaged, the Dana 44 front axle with the center axle disconnect is the place to look. The USA Standard Gear ZK D44-DIS is the master overhaul kit for that axle. It is new, uses Koyo bearings and races, and carries every bearing, seal and shim needed to rebuild the front differential or set up a new ring and pinion.

What the master overhaul kit does in a Dana 44 disconnect front

Dodge did not use locking hubs on these trucks. Instead the front Dana 44 has a split right side axle: an inner shaft that comes out of the carrier and an outer shaft that goes to the wheel, joined by a sliding collar. In 2WD the collar is pulled back and the passenger side is cut loose, so the carrier and ring gear sit nearly still while the truck rolls. In 4WD a shift fork slides the collar over both shafts and locks the axle together. The differential itself is a standard Dana 44: the pinion turns on two tapered bearings held at preload by a crush sleeve, and the carrier rides on two side bearings whose shims set carrier preload and ring gear backlash.

USA Standard lists the kit contents as carrier bearings and races, pinion bearings and races, a pinion seal, axle seals, a complete shim kit, ring gear bolts, a pinion nut, a crush sleeve, oil baffles and slingers, thread locker, marking compound with a brush, and a cover gasket. The disconnect collar, shift fork and the support bushing for the inner shaft are not part of this kit.

Symptoms this kit addresses

• Whine or howl from the front that appears or gets louder in 4WD
• Growl from the front even in 2WD, which points to bearings turning with play in them
• Gear oil leaking from the pinion seal or from the inner axle tube seals
• Clunk in 4WD when you go on and off the throttle
• Metal flakes on the cover magnet or milky oil after deep water
• A ratio change to match larger tires

How to confirm before ordering

Pull the cover and look at the oil and the gear teeth. Pitted teeth or flaked bearing races mean the gears may need replacing too. Rock the front driveshaft yoke up and down; vertical play means worn pinion bearings. A grinding noise or no front engagement in 4WD is usually a disconnect problem, such as a worn collar or a vacuum leak, not the bearings, so check that system separately. Unit bearings and U-joints also make noise. Raise the front and check each wheel for play before you open the differential. If you keep the old gears, measure backlash with a dial indicator before you tear it down.

Fitment

The manufacturer lists ZK D44-DIS for the Dana Spicer 44 Dodge disconnect front. Parts catalogs show this axle under the 1994 to 2001 Ram 1500 4x4 and Ram 2500 light duty trucks, with the disconnect on the passenger side. Heavier 2500 and 3500 trucks from those years used a Dana 60 front, which takes a different kit. Earlier Dodge W-series pickups also had a disconnect Dana 44, so compare your bearing and race numbers to be sure, or send us the year, model and VIN. Dana 44 front axles from other makers need their own kits, for example the Yukon Dana 44 standard rotation front kit or the Dana 44 IFS kit for Ford trucks. See more in our rebuild kits collection.

Install notes

• Remove the front driveshaft and pull both outer axle shafts before you take out the carrier, and note how the inner right shaft and collar come apart.
• Mark the bearing caps; they are matched to the housing.
• Use a side bearing puller to remove the old carrier bearings and keep the old shims as a starting point.
• Install the oil baffle and slinger behind the pinion races; they feed oil to the pinion bearings.
• Crush the new sleeve in small steps and check turning torque often. If you go past the target, replace the sleeve.
• Install the new axle tube seals with care so the inner shafts do not cut them, then torque the ring gear bolts with thread locker and read the pattern with the marking compound.
• Fill with the gear oil grade in your owner manual and test the 4WD engagement before road testing.

Will this kit fit my 2001 Ram 2500 with a Cummins?

Usually not. Diesel and V10 Ram 2500 and 3500 trucks from that era used a Dana 60 front axle. This kit is for the Dana 44 disconnect front used on the Ram 1500 and light duty 2500. Check the axle tag or send us your VIN.

Does the kit include the disconnect collar or shift fork?

No. It covers the differential: carrier and pinion bearings and races, pinion seal, axle seals, shims, ring gear bolts, pinion nut, crush sleeve, oil baffles and slingers, thread locker, marking compound and a gasket. Disconnect parts are sold separately.

Why does my front axle whine in 4WD only?

In 2WD the disconnect lets the carrier sit nearly still, so worn gears and bearings are quiet. In 4WD they carry load and turn at road speed, which brings out bearing and gear noise. That pattern points to the differential this kit rebuilds.

What bearings does it use?

USA Standard lists Koyo bearings and races for this kit.

Can I install it without special tools?

You need a bearing puller, race drivers, an inch-pound torque wrench for pinion preload, and a dial indicator for backlash. Without them, have a shop set up the gears.