Exhaust System - Cracks/Breaks Between Muffler/Tailpipe

Article No.
98-25-21

12/21/98

EXHAUST SYSTEM - CRACK OR BREAK BETWEEN
MUFFLER AND TAILPIPE - VEHICLES WITH 5.4L
ENGINE AND 4X4, OR VEHICLES WITH 4.6L ENGINE
AND NON-AIR SUSPENSION

LIGHT TRUCK:
1997-99 EXPEDITION

ISSUE
Breakage of the exhaust system between the muffler and tailpipe may occur on some vehicles. This may be due to the double cardan driveshaft mass causing a resonant frequency that fatigues the exhaust system between the muffler and tailpipe.

ACTION
Replace the double cardan driveshaft with a new heavy duty single cardan driveshaft. Then replace broken exhaust system. Refer to the following Service Procedure for details.

SERVICE PROCEDURE

1. Replace the double cardan driveshaft with a new Heavy Duty Single Cardan Driveshaft (XL1Z-4602-AA - 5.4L engine or XL1Z-4602-BA - 4.6L engine) by referring to the appropriate year Expedition Workshop Manual, Section 205-01. Be sure to align paint mark on driveshaft to paint mark on axle flange. This is necessary to avoid driveline vibration.

2. Replace the muffler and tailpipe assembly by referring to the Workshop Manual, Section 309-00.





Parts Block

OTHER APPLICABLE ARTICLES: NONE

WARRANTY STATUS: Eligible Under The Provisions Of Bumper To Bumper Warranty Coverage

OPERATION DESCRIPTION TIME

982521A Replace Driveshaft, 0.7 Hr.
Muffler, And Tailpipe

DEALER CODING
CONDITION
BASIC PART NO. CODE
4602 D9

OASIS CODES: 403000, 702000, 702200, 703000