Driveline/Extension Housing - Vibration/Leaks

Article No.
01-9-3

05/14/01

^ VIBRATION - FROM DRIVELINE - 4X2 VEHICLES
WITH 4R70W AND 139 INCH WHEELBASE

^ TRANSMISSION - 4R7OW - FLUID LEAK FROM
EXTENSION HOUSING SEAL - 4X2 VEHICLES WITH
139 INCH WHEELBASE

FORD:
1997-2000 F-150, F-250 LD

This article is being republished to update the model year coverage and to update the part application.

ISSUE
A driveline vibration and/or a transmission fluid leak from the extension housing seal area may occur on some vehicles. This may be caused by the extension housing bushing or seal walking/spinning out due to excess driveshaft flexing during extended high speed operation.

ACTION
Inspect the extension housing bushing and seal. If the extension bushing/seal is spun and/or walked out, replace the extension housing assembly and gasket with new service parts, and replace the driveshaft with a revised 127 mm (5") diameter driveshaft. In addition, some vehicles will require the balance marks on the driveshaft, output shaft, and rear axle flange to be aligned so a repeat condition will not occur. Refer to the following Service Procedure for details.

SERVICE PROCEDURE

1. Raise the vehicle on a hoist and inspect the transmission extension housing bushing and seal for damage. In addition, inspect the driveshaft diameter. The revised driveshaft has a 127 mm (5") diameter and the old part has a 114 mm (4.5") diameter.

2. If the extension housing bushing or seal is damaged, remove the driveshaft and transmission extension housing per the appropriate year Workshop Manual, Section 307-01. Install a new Extension Housing Assembly (F3LY-7A039-A), and a new Extension Housing Gasket (F6AZ-7086-A). Verify transmission fluid level.

3. If the vehicle is equipped with the 114 mm (4.5") aluminum driveshaft, replace the driveshaft with the revised 127 mm (5") Driveshaft (see parts list for application).








NOTE
ON VEHICLES BUILT AFTER 4/1/1998, THE INDEX PAINT MARKS ON THE OUTPUT SHAFT, DRIVESHAFT, AND REAR AXLE MUST BE ALIGNED. THE INDEXED BALANCE MARK ON THE OUTPUT SHAFT AND THE INDEXED BALANCE MARK ON THE NEW DRIVESHAFT YOKE MUST BE ALIGNED (FIGURE 1). ALIGNMENT OF THE INDEX MARKS ON THE REAR DRIVESHAFT TUBE AND THE REAR AXLE FLANGE MUST BE PERFORMED (FIGURE 2).





Parts Block

OTHER APPLICABLE ARTICLES: NONE
SUPERSEDES: 99-26-2
WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage

OPERATION DESCRIPTION TIME

010903A Replace Extension 1.6 Hrs.
Housing Assembly;
Driveshaft When Required
(Includes Inspection Time)

DEALER CODING
CONDITION
BASIC PART NO. CODE
4602 42

OASIS CODES: 501000, 502000, 503000, 504000, 510000, 703000, 703200, 703300, 703400