E 150 Van V8-351 5.8L VIN G 2-bbl (1984)
Technical Service Bulletin # 88717033088
Date: 880301
Vehicle - Body Boom Between 35 and 65 MPH
VIBRATION - DRIVELINE - 5.0L ENGINE WITH AOD TRANSMISSION OR 5.8L WITH C6 TRANSMISSION - DIAGNOSTIC AND SERVICE
PROCEDURE
NOISE - "BODY BOOM" - 5.0L ENGINE WITH AOD TRANSMISSION OR 5.8L WITH C6 TRANSMISSION - DIAGNOSTIC AND SERVICE
PROCEDURE
Article No. 88-7-17
LIGHT TRUCK:
1983-87 E-150
ISSUE:
"Body boom" and driveline vibration between the speeds of 35 and 65 mph (56 and 105 km/h) may be caused by one or more vehicle
component areas. The vibration and boom are usually more noticeable when the AOD transmission is operating in overdrive, but may also
occur when the AOD transmission is operating in third gear. In most cases there is more than one factor causing the NVH concern.
ACTION:
To correct this, use the following diagnostic procedures and the 1987 Light Truck Shop Manual, Section 18-01 to determine which vehicle
components require attention. The diagnostic procedures should be followed in the order in which they appear in this TSB article. After the
completion of each section the vehicle should be road tested to determine if the condition has been corrected. If the condition is still
present, proceed to the next section. An Econoline NVH diagnostic chart is on page 52 of this TSB to assist in concern identification.
Wheels & Tires, Chassis Groundout & Exhaust System
Wheels and Tires
1.
Make sure the front wheels are centered on the rotor hub pilot and the rear wheels are centered on the rear drum pilot by using the Rotunda Runout
Gauge, 007-00014 to check wheel and tire assembly runout.
NOTE:
Special attention should be given to vehicles equipped with aftermarket aluminum wheels.
2.
If incorrect wheel and tire assembly runout is found, loosen the lug nuts, rotate the wheel and tire assembly and carefully retighten the lug nuts
finger tight.
3.
Recheck the wheel and tire assembly runout while rotating the wheel and tire assembly. If the runout is okay, torque the lug nuts to 100 ft.lbs. (136
N-m). If runout is still incorrect, service as required.
Body to Chassis Groundout
1.
Raise the vehicle on a hoist and make sure the mounting bolts from aftermarket seats and safety belt anchors are not grounded to the frame, service
as required.
2.
Check to make sure the running boards are not grounded to the frame, service as required.
3.
Make sure the exhaust system is not grounded to the frame, service as required.
Exhaust System
1.
Check to make sure an exhaust bind-up condition is not present by using the following steps:
a.
Road test the vehicle to determine if a "drone" noise is present each time the transmission shifts from one gear to the next between 0 and 65
MPH (0 and 105 km/h).
b.
If "drone" noise is present, apply the parking brake, depress the brake pedal and brake torque engine to simulate condition. The "drone"
should appear around 1800 to 2000 RPM.
c.
Remove the exhaust system hanger in front and behind the muffler.
d.
Repeat Step b. If "drone" is gone, loosen the "Y" pipe at the exhaust manifold and the muffler.
e.
Reposition the exhaust system upward to eliminate stress on the two (2) hangers. Retighten the "Y" pipe to specification.
NOTE:
On 1987 vehicles, remove the front hanger bracket from the cross member. Knock out the existing retainer bolts from the hanger. Reinstall the
bracket with longer bolts and add 1/4" to 1/2" stack of washers to each bolt between the bracket and cross member. This will make sure the
rubber isolator is in a neutral position.
Driveshaft & Road Test Procedure Information
Driveshaft
