Yukon Gear Master Overhaul Kit For 07 & Down Ford 10.5in Diff

If your 1999-2007 F-250 or F-350 Super Duty, E-350 van or 2000-2005 Excursion now howls at highway speed, growls when you lift off the throttle, or has gear oil running down the pinion yoke, the bearings in the 10.5 in. rear axle are usually the reason. The Yukon Gear & Axle YK F10.5-A is a new master overhaul kit for the Ford 10.5 in. differential from 2007 and older. It replaces every bearing, race, seal and setup part in the axle so you can rebuild it with your existing ring and pinion or with a new gear set.

What the overhaul kit does in a Ford 10.5 rear axle

A ring and pinion only stays quiet when four tapered roller bearings hold it in one exact position. Two bearings carry the pinion and set its depth and preload; two more carry the differential carrier and set ring gear backlash and side load. When those bearings pit or a race spalls, the pinion walks and the ring gear runs out, the tooth contact pattern moves toward the edge of the teeth, and the axle starts to whine. Left alone, the gear teeth wear to the bad pattern and the gears become noisy for good. This kit includes carrier bearings and races, pinion bearings and races, a pinion seal, a complete shim kit, ring gear bolts, a pinion nut, a crush sleeve, oil baffles and slingers where your housing uses them, thread locker, marking compound with a brush, and a cover gasket. Yukon uses Timken bearings in its master kits.

Symptoms that call for an overhaul

• A whine that rises and falls with road speed and changes between acceleration and coast.
• A low rumble or growl under load, a sign of worn carrier or pinion bearings.
• Gear oil leaking at the pinion seal, often slung onto the frame or crossmember.
• Clunk on take-off or play you can feel by rocking the pinion yoke, from lost pinion preload.
• Bright metal flakes or a gritty paste on the drain plug or cover when you change the gear oil.
• Noise that started after the axle ran low on oil or was overheated while towing.

How to confirm before you buy

Drive the truck at the speed where the noise is loudest, then note whether it changes on throttle, on a steady cruise and on coast. Gear and bearing noise changes with load; a tire or wheel bearing noise usually changes with steering and does not care about throttle. Pull the cover, look at the oil and the tooth contact pattern, and grab the pinion yoke to check for end play. Rule out a slipping transmission or a worn driveline before you tear into the axle; our rebuild versus replacement cost guide helps when the drivetrain has more than one problem.

Fitment

Yukon lists the YK F10.5-A for the 1999-2007 F-250 and F-350 Super Duty, the 1999-2007 E-250 and E-350, the 2000-2007 E-450, the 2002-2003 E-550, and the 2000-2005 Excursion with the 10.5 in. rear axle. Factory options vary, so physically confirm the axle before ordering by checking the axle code on the door sticker or the tag on the cover bolts. Housings from 2008 and later use different parts; for a 2011-up 10.5 with the 37-spline pinion, use the Yukon YK F10.5-D kit instead. If you are unsure, send us your year and VIN before you order. Browse all of our axle and transmission rebuild kits.

Install notes

• Mark the carrier caps and record the original backlash and pattern before teardown, especially if you are reusing the gears.
• Yukon's setup chart for the Ford 10.25 and 10.5 lists 20-35 in-lb pinion bearing preload with new bearings, 95 ft-lb ring gear bolts and 80 ft-lb cap bolts. Use a new crush sleeve every time and crush it slowly; over-crushing means starting over with another sleeve.
• Set pinion depth first, then backlash and carrier preload, and confirm the final pattern with the marking compound before closing the cover.
• If the axle has a Trac-Lok limited slip, worn clutches chatter in turns; the Yukon Trac-Lok clutch set or a 3-pinion spider gear kit can go in while the carrier is out.
• Fill with the gear oil grade on your owner's manual or axle tag, and add friction modifier if your limited slip calls for it.
• With new gears, follow Yukon's break-in: drive lightly for the first 15-20 miles and let the axle cool, avoid hard acceleration for 100 miles, wait 500 miles before towing, and change the oil at 500 miles.

Every part ships new from the USA, so a truck that has been down for a noisy axle can be back on the road in one rebuild instead of a string of partial repairs.

Which trucks does the YK F10.5-A fit?

It is listed for the Ford 10.5 in. rear axle in 1999-2007 F-250 and F-350 Super Duty pickups, 1999-2007 E-250 and E-350 vans, 2000-2007 E-450, 2002-2003 E-550 and 2000-2005 Excursion. Factory axle options vary, so confirm the 10.5 in. axle before ordering, or send us your year and VIN.

Can I reuse my ring and pinion with this kit?

Yes. The kit has no gears, only the bearings, races, seals, shims and hardware, so you can rebuild around your original ring and pinion if the teeth are not damaged. Record the original backlash and contact pattern before teardown so you can put used gears back where they wore in.

Does this kit fit a 2008 or newer Super Duty?

No. This kit is for 2007 and older Ford 10.5 axles. Later housings use different parts, and for 2011-up trucks with the 37-spline pinion the matching kit is the Yukon YK F10.5-D.

What noise does a worn 10.5 differential make?

Usually a whine that changes with road speed and between acceleration and coast, or a deeper growl under load from worn bearings. Noise that changes when you steer, rather than with throttle, points more toward wheel bearings or tires.

What pinion bearing preload does Yukon list for this axle?

Yukon's setup chart for the Ford 10.25 and 10.5 lists 20-35 in-lb with new pinion bearings, 6-8 in-lb on used bearings, 95 ft-lb on the ring gear bolts and 80 ft-lb on the cap bolts. Always confirm against the instructions packed with your kit.

Is a break-in needed after the rebuild?

If you install new gears, yes. Yukon recommends light driving for the first 15-20 miles with a cool-down, no hard acceleration for 100 miles, no towing for 500 miles, and a gear oil change at 500 miles.