USA Standard Master Overhaul Kit For 2010 F150 & 2010+ Mustang

If the 8.8 rear in your 2010-2014 Mustang or 2010 F-150 whines at cruise, drones on decel, weeps oil at the pinion, or is about to get a ratio swap, this USA Standard Gear ZK F8.8-B master overhaul kit replaces the bearings and setup parts the job depends on. It is the transitional 8.8 kit: newer than the 2009-and-older 8.8 kits, and different from the 2015-up Super 8.8, so the version matters before you order.

What the master overhaul kit does in a Ford 8.8

The Ford 8.8 is an integral-carrier, 10-bolt-cover rear. The pinion sits on two tapered roller bearings in the housing nose, held at a set preload by a crush sleeve and pinion nut. The carrier rides on two more tapered bearings, and the shims behind them set carrier preload and ring gear backlash at the same time. Wear in any of those four bearings lets the pinion move off its setting, and that is when the gear set starts to sing. USA Standard lists the ZK F8.8-B as including Koyo carrier bearings and races, Koyo 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. Gears, axle bearings and axle seals are not part of this kit.

Symptoms that point to this kit

• A whine that tracks road speed, worst at a steady highway cruise
• Noise that is loud on acceleration and quiet on coast, or the reverse, from pinion bearing wear
• A growl that changes when the car loads up in a turn, typical of a carrier bearing
• Gear oil on the pinion yoke or the front of the housing from a failed pinion seal
• Play you can feel by rocking the pinion yoke up and down
• A gear change planned, where reusing old bearings and the old crush sleeve is a false saving

How to confirm before you buy

Drive the car on a smooth road and note whether the noise comes on drive, coast or both, then rule out tires and the transmission. Our breakdown of Ford 8.8 rear axle problems and rebuild cost covers the common failure points, and bad transmission vs bad differential noise helps you separate the two. Pull the cover, check the oil for metal and bearing flakes, and set a dial indicator on the ring gear to see whether backlash has opened up.

Fitment

USA Standard describes the ZK F8.8-B as fitting the 2010 Ford F-150 8.8 and the 2010-and-up 8.8 in the Mustang. Its fitment chart lists the 2010-2014 Mustang (8.8 with 3.250 in OD pinion bearing, 31-spline) and the 2009-2010 F-150, both with the 10-bolt cover. Note that the 2010 Mustang V6 used the smaller 7.5 rear; the 8.8 went into V8 cars and then every Mustang from 2011 to 2014. For 2009-and-earlier 8.8 rears, use the USA Standard ZK F8.8 kit or Yukon YK F8.8-A kit. The 2015-up 12-bolt Super 8.8 takes the ZK F8.8-D kit. F-150 years overlap during these changes, so count the cover bolts, check the axle tag, and send us your year and VIN if you want us to confirm before it ships.

Install notes

• Pull the axle shafts (C-clip design) before the carrier comes out, and mark the bearing caps so each goes back on its own side.
• Set pinion depth first with the supplied shims and the marking compound, then install the new crush sleeve and creep up on pinion rotating torque in small steps. If you want to avoid crush sleeve guesswork, the Yukon 8.8 crush sleeve eliminator replaces it with a solid spacer.
• Shim the carrier for preload and backlash, torque the ring gear bolts with thread locker, and check the drive and coast pattern before the cover goes on.
• On a Traction-Lok car, this is the time to refresh the clutch packs with the Ford Performance M-4700-B clutch kit.
• Fill with the gear oil Ford lists for your vehicle, plus friction modifier if the axle has a limited slip, and recheck the level after a short drive.

Will the ZK F8.8-B fit a 2015 or newer Mustang or F-150?

No. 2015-up Mustangs and F-150s use the Super 8.8 with a 12-bolt cover, larger bearings and a longer pinion. That axle takes the ZK F8.8-D kit.

Does it fit my 2010 Mustang V6?

Only if the car has an 8.8 rear. The 2010 V6 Mustang came with the smaller 7.5 axle; the 8.8 was used in V8 cars and in all Mustangs from 2011 to 2014. Count the cover bolts and check the axle tag.

Which F-150 years does it cover?

USA Standard's description names the 2010 F-150 and its fitment chart lists 2009-2010 F-150 8.8 rears. Earlier 8.8 trucks use the 2009-and-older kit. Send us your VIN if you are not sure.

What bearings are in it?

Koyo carrier and pinion bearings and races, per USA Standard Gear.

Are axle bearings and axle seals included?

No. The kit covers the carrier and pinion side: bearings and races, pinion seal, shims, ring gear bolts, pinion nut, crush sleeve, thread locker, marking compound with brush and a gasket.

Do I need special tools?

Plan on a carrier bearing puller, a press or bearing driver for the races, an inch-pound torque wrench for pinion rotating torque, and a dial indicator for backlash.