Hey guys, I’m putting the newly released 5” Rough Country lift kit on my 1999 Ford Ranger.

There’s a whole page about vacuum operating hub locks and apparently I’m going to need to replace the o-rings in them because it’s a new knuckle.

The instructions say:
“There are two each, of these Ford part numbers, per vehicle:
#F87Z-1177-AA; O-ring for wheel bearing hub-to-knuckle
#F87Z-1177-BA; O-ring for locking hub-to-wheel bearing hub
#F87Z-1190-AA; axle half shaft main seal”

I can’t definitively find any of these parts and was hoping someone might be able to point me in the right direction here...

I understand there I’d a lift section but because I actually like my vacuum operating hubs and would like to keep them I thought I’d post this here since I’m just looking for OEM replacement parts anyway.

Any and all help would be appreciated!

EDIT: Here’s the entirety of the vacuum hub instructions, I really can’t find any information on this.

Vacuum Operated Hub Instructions
If your vehicle is equipped with vacuum operated hubs, several other specialty tools are needed.
Ford suggests that these factory front axle components be replaced. If the parts are in good condition and carefully re- moved, they can be reused.
There are two each, of these Ford part numbers, per vehicle:
#F87Z-1177-AA; O-ring for wheel bearing hub-to-knuckle
#F87Z-1177-BA; O-ring for locking hub-to-wheel bearing hub
#F87Z-1190-AA; axle half shaft main seal

Use a hub puller tool or carefully use a flat screwdriver to remove the locking hub assembly from the hub. Remove the metal/plastic retainer ring on the CV axle stub shaft.

Remove the three bolts that attach the wheel bearing hub-to-knuckle. Take care not to damage the hub O-ring if you plan to reuse it.

The axle half shaft main seal is located on the inboard side of the stock knuckle. Use a puller tool to remove the seal if you want to reuse it instead of purchasing a new one.

Install the components removed above onto the Rough Country lifted knuckle.

Use a seating tool to install the axle half shaft main seal into the knuckle. Generously fill the sealing surface with Ford High Temperature Wheel Bearing Grease #E8TZ-19590-A or its equivalent.
NOTE: Some hubs have a needle bearing in the wheel bearing assembly. If so equipped, lube the needle bearing gener- ously with #E8TZ-19590-A grease or its equivalent.

Attach the wheel bearing hub to the knuckle with the three factory bolts. Take care not to damage the O-ring

Install the metal/plastic retaining ring, with the flat side facing inboard, onto the CV stub axle using snap ring pliers. Be sure the snap ring is fully seated in the snub axle groove.

Locking Hub - Be sure the rubber O-ring around the hub is not damaged. If O-ring damage is present, obtain replace- ments from the dealer before continuing. Position the hub onto the wheel hub and tap into place with a rubber ham- mer. Inspect the locking arms to ensure that they are fully seated in the hub groove.

NOTICE: To aid installation, the locking hub should be in the engaged position while mating it to the wheel hub.

Standby...

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Try Motorcraft BRS109 for outer hub oring. F8TZ1S177BB

For much less expensive O-rings you can actually find:

NAPA # BK 727-2153 <-- bigger O-ring for wheel bearing hub-to-knuckle (backside)
NAPA # BK 727-2140 <-- smaller O-ring for locking hub-to-wheel bearing hub (frontside)

as for the Axle Half-Shaft Main Seal, that's a beefy piece of rubber that lasts a while, but if it needs replaced, see if the NAPA guys can look it up!

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1999 Ranger XL Sport 4x4 (PVHubs, lol), 2-dr. "Supa" Cab, Vulcan(FLEX-fuel)+M5OD, LSDiff(7.5)... Aluminum "GT Racing" hood (lol), rubber flooring, hand-crank windows... bone stock, but gettin' ready to add some "thaaangs"...