Drivetrain - Vibration/Moaning Noise

91ford17

Article No.
91-8-26

04/17/91


^ NOISE - "MOAN" FROM CAB FLOOR - CREW CAB MODELS WITH E40D TRANSMISSION

^ VIBRATION IN CAB FLOOR AREA - CREW CAB MODELS WITH E40D TRANSMISSION


LIGHT TRUCK: 1989-90 F-350


ISSUE: A "moaning" noise or floor vibration may be experienced in the 1500-1700 RPM range while in DRIVE or OVERDRIVE. This usually occurs on a moderate "tip-in". This condition is caused by transmitted drivetrain vibrations.

ACTION: Road test the truck to determine if a new driveshaft with a torsional damper is required. Refer to the following procedure for service details.


1. Drive the vehicle in both DRIVE and OVERDRIVE.

a. Operate the truck through the 1500-1700 RPM range.

b. Determine if the moan or vibration is from the cab floor.

c. If the moan/vibration is from the cab floor, proceed to Step # 2.

2. Install a driveshaft with a torsional damper. Refer to the 1989-90 F-Series Truck Shop Manual, Section 15-01, for service details.

NOTE: IF THE TRUCK IS A 4 X 2, ALSO REPLACE THE REAR AXLE COMPANION FLANGE (E7TZ-4851-A). INSTALL TWO (2) STRAP RETAINERS AND FOUR (4) ALLEN HEAD SCREWS. TIGHTEN THE ALLEN SCREWS TO 25-40 LB.FT. (34-54 N-m).


PART NUMBER PART NAME CLASS

F1TZ-4602-AW Driveshaft (4x4) CG
F1TZ-4602-AY Driveshaft (4x2) CG
E7TZ-4851-A Companion Flange B
E4HZ-4A254-B Strap Retainers (2 req.) RM
390880-S100 Allen Head Screws (Pkg. of 4) BS

OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Eligible Under Basic Warranty
Coverage, Powertrain
Warranty Coverage
OPERATION DESCRIPTION TIME
910826A Install Driveshaft - 4 X 4 0.5 Hr.
910826B Install Driveshaft - 4 X 2 1.0 Hr.
910826C Additional Time If Required 0.2 Hr.
To Replace Collapsable Spacer - 4 X 2
DEALER CODING
BASIC PART NO. CONDITION CODE
4602 67
OASIS CODES: 702000, 703000