Yukon Gear Master Rebuild Kit for Jeep Wrangler JL Dana 44 / 210mm Front
A whine that rises and falls with throttle, a growl from the front of a Wrangler JL Rubicon with four-wheel drive engaged, or a pinion seal that keeps leaking gear oil onto the skid plate all point to the same job: new bearings and seals in the front Dana 44. This is the Yukon Gear & Axle Master Overhaul Kit, part number YK D44JL-FRONT, built for the 210mm Dana 44 front axle used on the JL. Yukon packs it with Timken bearings and races, seals, small parts and setup shims, so the whole center section can be rebuilt in one pass instead of piecing it together.
The JL Rubicon front is a new-design Dana 44 with an 8.5 inch ring gear, and like the JK it runs a reverse-cut ring and pinion. The pinion rides on two tapered bearings that must hold an exact preload, and the carrier sits on two side bearings that set backlash and hold the ring gear against the pinion under load. When any of those bearings wear, the gear contact pattern moves, and the gears start to sing long before they break. A master overhaul kit replaces every one of those bearings and races together, along with the seals, so the gear set runs on fresh bearings at the correct preload. Yukon includes shim stacks and its super shims so pinion depth and carrier position can be set accurately during the rebuild.
Separate the front axle from everything else that hums. With the vehicle in two-wheel drive the front differential is barely loaded, so a noise that only appears or gets worse in four-wheel drive leans toward the front center section. Wheel bearings usually change with steering input, and tire noise changes with road surface. Drain the gear oil and look at it: a fine gray haze is normal wear, but flakes or chips mean a bearing or gear is coming apart. Grab the pinion yoke and check for in-and-out or up-and-down play, which means the pinion bearings have lost preload. Fluid on the pinion area is often only the seal, but on a high-mileage axle it is worth doing the full kit while the yoke is off anyway. Our Wrangler JK and JL service guide covers the rest of the driveline service you can do at the same time.
This kit is listed for the Jeep Wrangler JL Dana 44 210mm front axle. On the JL, that axle comes on the Rubicon; Sport and Sahara models use a Dana 30 front, which this kit does not fit. Gladiator JT models also run a new-design Dana 44 front. Confirm what you have from the axle tag or the build sheet before ordering, and if you are unsure, send your year and VIN and we will check it for you. The matching Yukon master kit for the JL Dana 44 220mm rear covers the other end, and more parts are in our rebuild kit category.
This is a precision job. Mark and measure before you take anything apart: record the existing backlash and the gear contact pattern so you know whether the old setup was right. Press the old races out and the new Timken races in fully seated, then set pinion depth with the shims, set pinion bearing preload, install the carrier and set backlash and carrier bearing preload with the side shims. A Dana 44 carrier shim driver lets you tap the side shims in without damaging them, and a clamshell carrier bearing puller gets the old side bearings off the carrier cleanly. Check the contact pattern with marking compound before you button it up, and remember the JL front uses a reverse-cut gear, so read the pattern accordingly.
If the gears themselves are pitted or you want a different ratio for bigger tires, this is the time to swap them; a JL Rubicon 4.56 gear set drops in during the same setup. Fill with the gear oil grade your owner's manual calls for, generally a 75W-90 or 75W-140, and break new gears in gently for the first few hundred miles with no towing or hard off-road use.
| Brand | Yukon Gear & Axle |
| Part number | YK D44JL-FRONT |
| Fits | Yukon Gear Master Rebuild Kit for Jeep Wrangler JL Dana 44 / 210mm Front |
| Type | Differential Overhaul 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. On the JL, the Dana 44 210mm front comes on the Rubicon. Sport and Sahara models use a Dana 30 front. Check the axle tag or build sheet, or send your VIN and we will confirm.
Yukon builds this master overhaul kit with Timken bearings and races, plus seals, small parts and setup shims.
Yes, if the gears are not pitted, chipped or scored. Record the original backlash and pattern before teardown so you can set the old gears back up where they were wearing.
You need a press or bearing drivers, a dial indicator for backlash, an inch-pound torque wrench for pinion preload, and marking compound. A carrier bearing puller and shim driver make the job much easier.
Use the grade your owner's manual specifies, generally a 75W-90 or 75W-140. If your axle has a clutch-type limited slip, add friction modifier as directed. Change it again after the break-in period.
