Yukon Gear Hardcore Locking Hub For Dana 60 / 35 Spline. 99-04 Ford / 1 Side Only

Only one front hub on your 1999-2004 Ford F-250 or F-350 Super Duty is acting up? You do not have to buy a pair. Yukon Gear & Axle part YHC71002 is a single Hardcore locking hub, sold one side only, for a Dana 60 front axle running 35-spline outer stub shafts. It is the answer when one hub ratchets, slips out of LOCK or has a broken dial, and the hub on the other side is a Hardcore unit or another manual hub that still works fine.

What a locking hub does on the Super Duty Dana 60

On these trucks the wheel turns on a bolt-in unit bearing, and the outer axle stub passes through the middle of it. The lockout bolts to the face of that bearing and is the only connection between stub and wheel. Twist the bezel a third of a turn to LOCK and a spring drives an internally splined coupler across the stub splines and into the hub, so the front axle can pull that tire. Turn it back to FREE and the coupler is held out, so the wheel freewheels and the front driveline stays still in two-wheel drive. Yukon builds the Hardcore with chromoly internals, steel housing and bezel, a coating on the locking gears to cut friction, and a design that rests in the locked position and stays engaged under heavy torque. There is no AUTO setting and no vacuum line on this hub.

Symptoms that point at one bad hub

• Clicking or ratcheting from one front corner when 4WD is engaged
• The truck pulls with one front tire only, or the hub pops out of LOCK on a hard climb
• A cracked dial or a bezel that will not turn or will not stay in position
• A hub that stays engaged in FREE, so the front driveshaft keeps spinning in 2WD
• Water or rust inside the hub after a deep crossing

How to confirm before ordering

Jack up the suspect side, set the dial to LOCK and the transfer case in 4WD with the engine off, then turn the tire by hand. If the tire spins without moving the front driveshaft, the hub is not coupling. Next check the stub: a worn spindle-to-axle bearing or a chewed stub spline can keep any hub from engaging, and a new hub will not cure that. Our locking hubs not engaging guide walks through the checks, and the 1999-2004 Super Duty hub guide explains why the factory AUTO hubs on these trucks fail.

Fitment

YHC71002 is the one-side version of Yukon's 99-04 Ford Super Duty 35-spline set. Yukon's install chart lists the 35-spline Super Duty hubs for trucks with aftermarket unit bearings, because the factory 1999-2004 Super Duty stub is 30-spline. Pop the cap and count the stub splines before you order. If you have both sides to do, the YHC70002 35-spline Super Duty pair covers it, and a stock 30-spline truck takes the YHC70004 30-spline set. Yukon also sells a single 30-spline Dana 60 Hardcore hub. Some early Super Duty trucks have a Dana 50 front rather than a Dana 60, so read the axle tag as well. Send us your year, VIN and spline count and we will check it.

Install notes

• Set the transfer case to 2WD, park on level ground and remove the old hub bolts and hub.
• Behind the hub you should find the stub, the inner face of the unit bearing, a washer and a snap ring. Yukon requires the factory washer and snap ring on every unit bearing install, so replace them if they are gone.
• There is no spring retainer to fit on a unit bearing truck; the coil spring rides in the outer hub.
• Clean the splines, grease every internal part with high pressure grease, check that driver float is under 0.200 in, and torque the bezel bolts to 22 in-lbs with Loctite 242.
• Lift the wheel and test both positions: LOCK should turn the driveshaft, FREE should not.

While the hub is off, a Super Duty front hub seal kit keeps water out of the new hub. If the front differential also needs gears or bearings, the 99-16 Super Duty Dana 60 front master install kit is the matching job. Compare hub designs in our manual locking hub buyers guide.

Is YHC71002 one hub or a pair?

One hub for one side. For both front wheels buy two, or order the YHC70002 pair.

Will it fit my stock 2001 F-250 Super Duty?

Only if the outer stubs have been changed to 35-spline. The factory 1999-2004 Super Duty stub is 30-spline, which takes the YHC70004 set. Count the splines before ordering.

Can I run one Hardcore hub with a different hub on the other side?

Each hub works on its own side, so a single replacement is common. Both hubs must be set to LOCK for four-wheel drive, so make sure the other side engages and releases properly.

Does the hub need the old washer and snap ring?

Yes. Yukon says the factory washer and snap ring are required on all unit bearing installs.

Does it have an automatic mode?

No. It is a manual FREE/LOCK hub that engages with a one-third turn of the bezel and uses no vacuum.

How do I look after it?

Yukon recommends taking the hub apart, cleaning and re-greasing it after it has been under water or mud.