Driveline - Vibration Between At 25 And 50 MPH

91ford20

Article No.
91-13-11

06/26/91


^ BOOM/VIBRATION - WHEN DRIVING AT 25-50 MPH - 4 X 2 SUPER CAB MODELS BUILT PRIOR TO 12/15/89

^ DRIVELINE - BOOM/VIBRATION WHEN DRIVING AT 25-50 MPH - 4 X 2 SUPER CAB MODELS BUILT PRIOR TO 12/15/89


LIGHT TRUCK: 1987-90 RANGER


ISSUE: A driveline boom/vibration may occur when driving at 25/50 MPH. This condition is usually due to driveline imbalance sensitivity.

ACTION: Install new tighter fitting driveshaft assemblies. Refer to the following procedure for service details.


1. Remove the driveshaft assembly. Refer to the 1987-90 Ranger Shop Manual, Sections 15-61 or 05-01, for service details.

NOTE: IDENTIFY THE YELLOW MARK ON THE AXLE FLANGE FOR PROPER DRIVESHAFT INDEXING DURING REASSEMBLY. DO NOT GET DIRT ON THE TRANSMISSION OUTPUT SHAFT.

2. Install the new driveshaft.

a. Be sure that all components are properly indexed and the yellow dots are aligned.

b. Tighten the four (4) driveshaft attaching bolts to 61-87 lb.ft. (83-118 N-m).

c. Tighten both center bearing bracket bolts to 27-37 lb.ft. (37-50 N-m).


PART NUMBER PART NAME CLASS

F0TZ-4R602-B Manual Transmission Driveshaft C
(1990)
F0TZ-4R602-F Automatic Transmission B
Driveshaft (1990)
N800594-S100 Driveshaft Attaching Bolt (Pkg. AM
of 4, 4 Req.)
N605800-S100 Center Bearing Bracket Bolt BS
(Pkg. of 1, 2 Req.)
N801673-S2 Center Bearing Bracket Nut S
(Pkg of 8, 2 Req.)
E8TZ-4R602-U Automatic Transmission B
Driveshaft (1987-89)
E9TZ-4R602-L Manual Transmission Driveshaft
(1987-89) C

OTHER APPLICABLE ARTICLES: NONE
WARRANTY STATUS: Eligible Under Basic Warranty
Coverage, Powertrain
Warranty Coverage
OPERATION DESCRIPTION TIME
911311A Install Driveshaft Assembly 0.4 Hr.
DEALER CODING
BASIC PART NO. CONDITION CODE
4R602 67
OASIS CODES: 597997, 703000, 703300