Dana 44 Rebuild: Master Install Kit vs Bearing Kit

You have the cover off your Dana 44, the gear oil is full of glitter, and the pinion has play or the rear end is howling. Now you are staring at three kinds of kits that all look about the same in a photo: a master install (or master overhaul) kit, a bearing install kit, and a pinion install kit. They share most of the same bearings, but they are not interchangeable. Buy the wrong one and you end up waiting on shims or a ring gear bolt set halfway through the job.

This guide breaks down what each Dana 44 kit actually contains, which one fits your job, and what else to have on the bench before you start pulling bearings.

The Short Answer

• Master install / master overhaul kit: everything to set up a Dana 44 from scratch, including a full shim kit, ring gear bolts and pinion nut. Buy this for a new ring and pinion, or any time you are replacing all bearings and do not already own shims.
• Bearing install kit: the same carrier and pinion bearings, races, pinion seal and crush sleeve, but no shims. Built for shops and builders who already have shims on the shelf.
• Pinion install kit: pinion bearings, races, seal and pinion shims only. Meant for lower-mileage axles where the carrier bearings are still good and can be reused.

What Comes in a Dana 44 Master Install Kit

A master kit is the "open the box and build the axle" option. Rigid Axle's listing for the Yukon Master Overhaul Kit (JK non-Rubicon rear Dana 44) lists Timken carrier bearings and races, pinion bearings and races, pinion seal, a complete shim kit, ring gear bolts, pinion nut, crush sleeve, oil baffles and slingers, thread locker, marking compound with brush, and a gasket.

Revolution Gear & Axle builds its 35-2033 master install kit the same way for most 2003-and-older Dana 44 rear axles: Timken pinion and carrier bearings, pinion seal, crush sleeve, carrier shims, pinion shims, cover gasket/silicone and ring gear bolts. One thing it does not include is axle seals, so order those separately if your axle shafts are coming out.

The reason the shims matter: pinion depth and carrier bearing preload/backlash on a Dana 44 are set with shims. Any time you change the ring and pinion, the pinion depth almost always changes, and you will be swapping shims until the marking compound shows a good contact pattern. A master kit puts that full assortment in your hand so you are not guessing at thickness or making a parts run mid-setup.

What Comes in a Dana 44 Bearing Install Kit

A bearing install kit is a master kit minus the shims and some small hardware. Yukon's BK D44HD bearing install kit includes carrier bearings and races, pinion bearings and races, a pinion seal, crush sleeve, and marking compound with brush. Yukon describes these kits as aimed at shops and builders who already have shims on the shelf and want to save cost over a master overhaul kit.

That is the key point for a first-time or once-a-decade rebuilder. If you do not have a shim assortment for your specific Dana 44, a bearing kit alone will not get the axle set up. You would be reusing your old shims, and if you are installing new gears, the old pinion shim stack is rarely the right thickness for the new pinion.

Where a bearing kit makes sense:

• You are re-bearing an axle with the original gear set, so you can measure and reuse the existing shim stacks.
• You run a shop or do multiple axles and already stock Dana 44 shims.
• You bought a gear package or installed gears recently and still have a spare shim kit.

What Comes in a Pinion Install Kit

The third option is narrower still. Yukon's PK D44 pinion install kit contains pinion bearings and races, pinion seal, a complete pinion shim kit and marking compound with brush. Yukon positions it for gear installs on lower-mileage vehicles where the carrier bearings and races can be reused.

If you are regearing a clean, low-mile axle and the carrier bearings spin smooth with no pitting on the rollers or races, a pinion kit can do the job. If you have any doubt about the carrier bearings, or the axle has been run low on oil, go with the master kit and replace everything.

Side-by-Side: Master Install Kit vs Bearing Kit vs Pinion Kit

Contents compiled from the Yukon and Revolution Gear kit listings in the Sources below. Exact contents vary by part number, so check the individual listing for your axle.

Which One Do You Need?

1. New ring and pinion (regear): master install kit. You need new bearings and a full shim assortment to hit pinion depth and backlash on the new gears. A pre-2003 Dana 44 rear master install kit or the Yukon Dana 44 rear master overhaul kit covers it.
2. Bearing noise, original gears, no shims on hand: still the master kit. It is the only one of the three with both carrier and pinion shims, which you will want if a measurement comes out off during reassembly.
3. Bearing noise, original gears, you have shims: a bearing install kit such as the Yukon Dana 44-HD bearing install kit.
4. Low-mile regear with good carrier bearings: a pinion install kit, like the Yukon pinion install kit for the JK non-Rubicon rear Dana 44.

Match the kit to the exact axle version. Dana 44 kits are split by front vs rear, standard vs reverse rotation, 44-HD, IFS, spline count, and Jeep generation (TJ, JK, JL), and they are not cross-compatible. Browse the bearings and install kits collection and filter by your axle before you order.

Tip: Set-Up Bearings Save Your New Bearings

Every shim change means pulling and re-pressing bearings, and that is hard on new parts. Set-up bearings solve that. East Coast Gear Supply explains that their Dana 44 set-up race is machined to slide in and out of the housing so you can change the pinion shim, and the set-up carrier bearings are honed to slide on and off the carrier while you adjust backlash. Once the pattern is right, you press on the new bearings from your kit. Note that their kit is listed for 30-spline Dana 44s only and not for Jeep JK axles.

Replace While You Are In There

• Axle seals: not in every kit. If the shafts come out, new seals are cheap insurance against gear oil on the brakes.
• Ring and pinion: if the teeth show pitting, chipping or a wear ridge, new bearings will not quiet it. See our guide on differential whine and worn ring and pinion gears, and shop Dana 44 ring and pinion sets.
• Carrier / locker: if you are already regearing, it is the cheapest time to add a limited slip or locker from our differentials collection.
• Gear oil: fresh fluid to the axle manufacturer's spec and capacity, plus friction modifier if your carrier calls for it.

Cost and Effort

The kit is the easy part. Setting up a Dana 44 means pressing bearings on and off, reading a gear pattern, and measuring backlash and preload with a dial indicator and an inch-pound torque wrench. Expect to press bearings on and off more than once while chasing the pattern, which is where most of the time goes. Many owners buy the parts and hand the setup to a local gear shop, which is a reasonable call if you do not own a bearing puller, press and dial indicator.

If you are unsure whether your axle is a Dana 44 or something heavier, our Dana 44 vs Dana 60 comparison covers how to tell them apart.

Frequently Asked Questions

Is a master overhaul kit the same as a master install kit?

Functionally, yes. Yukon calls theirs a Master Overhaul Kit and Revolution Gear calls theirs a Master Install Kit. Both include carrier and pinion bearings and races, pinion seal, crush sleeve, carrier and pinion shims, and ring gear bolts. Check each listing for axle seals, since not every kit includes them.

Can I use a bearing kit when installing new gears?

Only if you already own the correct shims. Yukon's bearing install kits do not include shims, and new gears almost always need a different pinion shim stack than the old set. Without shims on hand, buy the master kit.

When is a pinion install kit enough?

Yukon recommends pinion install kits for gear installs on lower-mileage vehicles where the carrier bearings and races can be reused. If the carrier bearings are rough, pitted or the axle ran low on oil, replace everything with a master kit.

Sources

• Yukon Gear & Axle - Bearing install kit for Dana 44-HD (BK D44HD)
• Yukon Gear & Axle - Pinion install kit for Dana 44 (PK D44)
• Revolution Gear & Axle - Dana 44 Rear Master Install Kit (35-2033)
• Rigid Axle - Yukon Master Overhaul Kit for Dana 44 Rear
• East Coast Gear Supply - Dana 44 Bearing Set-Up Kit