Yukon Gear Hardcore Drive Flange Kit For Dana 44 / 30 Spline Outer Stubs. Yukon Engraved Caps
If you have built a Dana 44 front axle with aftermarket 30-spline outer stubs and you are still running locking hubs, the hubs are now the weakest link between the axle and the tire. Yukon Gear & Axle part YHC50001 is a Hardcore drive flange kit made for exactly that axle: two drive flanges cut for 30-spline outer stubs, two Yukon engraved caps and the hardware to mount them. It is aimed at rock crawlers and trail rigs with bigger tires and a front locker, where hub internals that slip, strip or pop out of engagement end the day.
A locking hub has a sliding clutch inside that couples the outer axle stub to the wheel hub when you turn the dial. A drive flange removes that clutch. It is a single steel piece splined to the stub on the inside and locked to the wheel hub on the outside, so the stub and the wheel are always tied together. Yukon describes these kits as everything needed to replace internal manual locking hubs. The trade-off is that the front axle shafts, front differential and front driveshaft turn any time the vehicle rolls, even in 2WD. You still choose 2WD or 4WD at the transfer case, but you give up free-wheeling.
The 30-spline detail matters. A stock front Dana 44 uses a 1.175 in, 19-spline outer shaft. Thirty-spline outers are an upgrade that usually goes in with chromoly shafts and stronger U-joints, and this flange kit only fits those upgraded stubs. On a stock 19-spline front, the correct kits are the 19-spline engraved-cap flange kit or the 19-spline plain-cap version.
Jack up both front tires, put the transfer case in 4WD and lock the hubs. Turn one tire by hand: the front driveshaft should move. If a hub spins without turning the stub, the hub has failed. Then pull the hub cap and check the stub itself. Grab it and feel for up-and-down and in-and-out play, which points to the spindle bearing or the inner seal and outer U-joint rather than the hub. Count the stub splines and confirm 30 before ordering. If a stub has twisted splines, replace the shaft first; a new flange on a damaged stub will not seat correctly.
YHC50001 fits Dana Spicer 44 front axles with 30-spline outer axle stubs. That makes it a build-specific part rather than a year-and-model part: what decides fitment is your stub spline count and the hub style on your knuckle, not the truck badge. If you are unsure what was installed during a previous axle build, count the splines on the stub or send us your year, VIN and a photo of the stub and hub, and we will check it before it ships. More axle parts are in our rebuild and install kits collection, and the same design for one-ton axles is the Dana 60 30-spline flange kit.
If the axle is apart for 30-spline shafts, many builders add a selectable locker such as the Eaton ELocker4 for 30-spline Dana 44 fronts or a Dura Grip limited slip, and fit fresh inner seals with an inner axle seal installer so gear oil stays out of the knuckles.
| Brand | Yukon Gear & Axle |
| Part number | YHC50001 |
| Fits | Yukon Gear Hardcore Drive Flange Kit For Dana 44 / 30 Spline Outer Stubs. Yukon Engraved Caps |
| Type | Differential Install 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.
Usually not. A factory front Dana 44 has 19-spline outer stubs. YHC50001 is cut for 30-spline outer stubs, which come with aftermarket shaft upgrades. Count the stub splines first; a stock axle needs the 19-spline YHC50007 or YHC50008 kit.
Yes. With flanges in place the stubs are permanently tied to the wheel hubs, so the axle shafts, front differential and front driveshaft spin whenever the vehicle moves. You still pick 2WD or 4WD at the transfer case.
Two drive flanges, two Yukon engraved caps and the hardware needed to mount them, enough to convert both sides of the axle.
Repack the wheel bearings with wheel bearing grease during the swap. The front differential uses 75W-90 or 75W-140 gear oil, plus friction modifier if it has a clutch-type limited slip.
Yes, the flanges bolt on where the hubs were. You would need hubs built for 30-spline stubs, since stock-spline hubs will not fit the upgraded shafts.
