USA Standard Master Overhaul Kit For 11+ Ford 9.75in Diff

If your 2011-or-newer F-150 has started to whine at highway speed, hums louder with a trailer behind it, or shows play at the rear pinion yoke, the bearings in the Ford 9.75 in. rear axle are the usual suspect. The USA Standard Gear ZK F9.75-D master overhaul kit is made for the redesigned 2011-and-up Ford 9.75 with the 12-bolt cover. USA Standard Gear is the value line from Yukon Gear & Axle, and this kit puts every bearing, race, seal and setup part for that axle in one box.

What the overhaul kit does in a 2011-up Ford 9.75

The 9.75 is a semi-float, C-clip rear axle. The pinion is carried by two tapered roller bearings with preload held by a crush sleeve and pinion nut, and the carrier turns on two tapered side bearings. Pinion depth is set with a shim behind the inner pinion bearing race. Ford reworked the 9.75 for 2011, and the gear design and setup numbers changed with it: Yukon's setup chart lists the 2010-and-older and 2011-up versions as separate rows. That is why this kit is year specific.

The 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, thread locker, marking compound with a brush, and a gasket. USA Standard Gear lists Koyo bearings and races for it. The Yukon-branded YK F9.75-D kit covers the same axle with Timken bearings, but Yukon's contents list for that one leaves out ring gear bolts, which this kit includes.

Symptoms of a worn 2011-up 9.75

• Whine between about 40 and 70 mph that changes pitch from throttle to coast: pinion bearings or a pinion that has lost preload.
• Low rumble that grows with load or towing: carrier bearings.
• A clunk on take-off, or in-and-out movement when you push and pull the yoke.
• Pinion seal leaking at the front of the housing, or a low oil level at the fill plug.
• Metal paste on the cover or the old oil when you drain it.

How to confirm before you buy

Road test at the speed where the noise is loudest, on throttle, cruise and coast. Gear and pinion bearing noise shifts with load; carrier bearing noise is steadier; a wheel bearing changes when you load one side in a sweeper. Our acceleration vs deceleration whine guide lays out that test, and our carrier bearing noise guide covers the steady growl. Then check the yoke for play and look at the oil. The Ford 9.75 problems page covers the leaks and bearing failures specific to this axle.

Fitment

USA Standard Gear lists ZK F9.75-D for the 2011-and-up Ford 9.75 in. rear axle, which is the solid rear axle used on many F-150s from 2011 on. It will not fit a 1997-2010 9.75; those use the 2000-2010 9.75 master overhaul kit. Yukon also sells separate kits for the independent 9.75 rear under the Expedition and for older housings converted to 2011-up gears, so a 9.75 that is not a stock 2011-up F-150 solid axle needs a check first. Many F-150s use an 8.8 instead of a 9.75; count the cover bolts (12 on both), then read the axle code on the door sticker or the tag on the cover bolt. Our 8.8 vs 9.75 guide shows how to tell them apart, or send us your year and VIN.

Install notes

• Yukon's setup chart for the 2011-up 9.75 calls for 17-25 in-lb of pinion bearing preload with new bearings (8-12 in-lb on used), 0.006-0.011 in. backlash on 5-cut gears (0.008-0.012 in. on 2-cut), 95 ft-lb on the ring gear bolts and 70 ft-lb on the bearing caps.
• Crush the new sleeve gradually and check rotating torque often. If you overshoot, replace the sleeve rather than backing the nut off.
• Carrier position and bearing preload are set with shims, and the Yukon 9.75 super carrier shim kit helps when a regear moves the carrier. Pull the side bearings with a proper puller such as the OTC 4520 set.
• A pitted or bent cover is a common leak source, so replace it with the 9.75 rear cover if the flange is rough. Refill with the gear oil and friction modifier your owner guide calls for, and check the pattern against our backlash and pinion depth guide.

Will this kit fit my 2009 F-150 with a 9.75 rear?

No. The 1997-2010 9.75 uses different bearings and setup parts. Use the 2000-2010 9.75 master overhaul kit, or send us the VIN if you are not sure of the axle.

How do I know my F-150 has a 9.75 and not an 8.8?

Both have 12-bolt covers. Read the axle code on the door sticker or the tag under a cover bolt, or measure the ring gear. Send us the VIN and we will check it.

What is the difference between this kit and the Yukon YK F9.75-D?

Both are for the 2011-up 9.75. This USA Standard Gear kit lists Koyo bearings and includes ring gear bolts; the Yukon kit lists Timken bearings and its contents list has no ring gear bolts.

Can I reuse my original ring and pinion?

Yes, if the teeth are not pitted or chipped. Note the original pinion shim, install the new bearings, then reset depth, preload and backlash and check the pattern before final torque.

Does the 9.75 need friction modifier after the rebuild?

If the axle has a limited slip, follow the friction modifier note in your owner guide when you refill. An open differential does not need it.