Front Differential - Moaning Noise In 2WD Mode

Article No.
99-14-3

07/12/99

^ NOISE - "MOANING" FROM FRONT DIFFERENTIAL
WHILE IN 2-WHEEL DRIVE - VEHICLES BUILT
THROUGH 4/15/1999

^ AXLE - "MOANING" NOISE FROM FRONT
DIFFERENTIAL WHILE IN 2-WHEEL DRIVE -
VEHICLES BUILT THROUGH 4/15/1999

FORD:
1997-1999 EXPEDITION, F-150, F-250 LD

LINCOLN:
1998-1999 NAVIGATOR

ISSUE
Some 4X4 vehicles built with center disconnect front axles may exhibit a "moaning" noise from the front differential while operating in 4X2 mode. The noise goes away when operating in 4X4 mode. This may be caused by the front differential side gears.

ACTION
Replace the front differential side gears with revised gears and replace the front differential pinion gears with revised gears. Refer to the following text for details.

For vehicles that exhibit a front differential moan in 4X2 mode that goes away in 4X4 mode, replace both front axle side gears and both front axle pinion gears. Replace any worn or damaged pinion thrust washers and side gear washers. Refer to Section 205-03 of the appropriate model/year Workshop Manual for removal and installation procedures.

PART NUMBER PART NAME

XL3Z-4236-M Side Gears (2 Per Box)
XL3Z-4215-M Pinion Gears (2 Per Box)
DOAZ-4230-B Pinion Thrust washer
C90Z-4228-B Side Gear washer

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage

OPERATION DESCRIPTION TIME

991403A Replace Axle Side Gears 1.4 Hrs.
And Pinion Gears

DEALER CODING
CONDITION
BASIC PART NO. CODE
4235 42

OASIS CODES: 509000, 597997, 702100