Ford 7.5 Differential Bearing Install Kit, ExCel XL-1045-1

A Ford 7.5 rear that hums at highway speed, changes pitch when you lift off the throttle, or weeps gear oil from the pinion seal is almost always a bearing job waiting to happen. The ExCel XL-1045-1 is a Koyo-bearing install kit built for that axle, the 10-bolt-cover rear found under Rangers, Bronco IIs, Aerostars, Fox-body and later V6 Mustangs, Thunderbirds, Cougars and a long list of Ford and Mercury cars. ExCel is the value line from Richmond Gear, and this kit is aimed at the shop or owner who wants fresh bearings and hardware in one box without paying for a premium bearing brand.

What the install kit does in a Ford 7.5

The 7.5 is a C-clip, integral-carrier axle. The pinion is held by two tapered roller bearings, and a collapsible crush sleeve between them sets how hard those bearings are loaded. The carrier turns on two side bearings in caps bolted to the housing. Everything about how quiet the axle runs depends on those four bearings holding the pinion and ring gear at the exact distance they were set up at. When a pinion bearing pits or loosens, the pinion walks forward and back under load and the gear contact moves off its sweet spot. That is the whine you hear, and it gets worse until the gears themselves start to wear. This kit replaces all four bearings and races plus the wear items you disturb to get to them.

What comes in the box

• Koyo tapered bearings and races for both carrier sides and the inner and outer pinion positions
• New pinion seal, pinion nut and crush sleeve
• Ring gear bolts
• Gear marking compound with brush and thread locker
• Cover gasket or RTV, depending on the kit run

A pinion depth shim pack is not called out in this kit's contents, so keep your original pinion and carrier shims labeled and on the bench. Axle shaft bearings and axle seals are separate parts.

Symptoms that point to worn 7.5 bearings

• Whine or howl tied to road speed that changes between drive and coast
• Low growl from the center of the car that builds above 40 to 50 mph
• Clunk or slack when you shift into drive or reverse, from pinion bearing play
• Wet pinion seal and a film of oil on the driveshaft yoke
• Bright metal paste on the cover magnet area or glitter in the drained oil
• Chatter in tight turns on Traction-Lok axles, which calls for the clutch packs as well as bearings

How to confirm before you order

Separate axle noise from wheel bearing and tire noise first. A wheel bearing usually changes when you sway the car left and right; pinion bearings change with throttle; carrier bearings hum steadily. Lift the rear, pull the driveshaft and rock the pinion yoke by hand: any free play is a failed pinion bearing or a backed-off nut. Then drain the oil and look for metal. Our Ford 7.5 rear axle problems and rebuild cost guide walks through what to expect. If the ring gear teeth are flaked, buy gears too, such as the Ford 7.5 3.73 ring and pinion package.

Fitment

The kit is cataloged for the Ford 7.5 inch 10-bolt rear. Listed vehicles include the 1983-2011 Ranger, 1984-1990 Bronco II, 1986-1997 Aerostar, 1979-2010 Mustang, 1980-1997 Thunderbird and Cougar, 1978-1983 Fairmont and Zephyr, 1979-1986 LTD, Marquis and Capri, 1982-1987 Continental, 1984-1987 Mark VII, Mercury Grand Marquis and the 1994-2001 Mazda B-Series pickups. Many of these vehicles were also built with the 8.8 axle, and both use a 10-bolt cover, so check the axle tag or measure the ring gear before you buy. Send us the year and VIN if you want us to check it. You can compare the Motive R7.5FRMK master kit, which adds shims, and browse more kits under rebuild kits.

Install notes

• Mark the bearing caps left and right before removal. A side bearing puller set removes the carrier cones without damaging the case.
• Drive in the new pinion races fully seated, check pinion depth with the marking compound, and adjust with your original shims if the pattern calls for it.
• Tighten the pinion nut in small steps against the new crush sleeve while checking rotating torque with an inch-pound wrench. Overshoot it and the sleeve must be replaced. A crush sleeve eliminator for the 7.5 and 8.8 is an alternative.
• Set backlash and carrier preload, read the pattern again, then seal the cover and refill with the gear oil grade on your axle label or owner's manual. Traction-Lok axles need the friction modifier Ford specifies.

Is the ExCel XL-1045-1 a full master kit?

It covers carrier and pinion bearings with races, pinion seal, crush sleeve, pinion nut, ring gear bolts, marking compound, thread locker and a cover gasket or RTV. A shim pack is not listed in its contents, so plan to reuse your shims or buy a shim kit if pinion depth must change.

Will it fit my Ranger?

It fits Rangers built with the 7.5 inch rear, which was common on four-cylinder and many V6 trucks from 1983 to 2011. Some Rangers came with the 8.8 instead. Check the axle tag or count the ring gear size, or send us your year and VIN.

My Mustang has a 10-bolt cover. Is it a 7.5?

Not necessarily. The Ford 7.5 and 8.8 both use 10 cover bolts. The 8.8 has a larger, more rounded cover and a bigger ring gear. The axle tag under a cover bolt is the surest check.

Can I reuse my ring and pinion with this kit?

Yes, if the teeth are smooth with no pitting or chipping. Keep the original shims, set the bearings up to the same depth, and confirm the pattern with the marking compound before closing the cover.

Do I need to replace axle bearings at the same time?

They are not in this kit, but the C-clips and shafts come out during the job anyway, so it is the cheapest time to replace worn axle bearings and seals.