A/T - Poor Towing Power
85ford21Article No. 85-21-17
POWER - LOW (6.9L DIESEL/C-6 AUTOMATIC TRANSMISSION) - PULLING TRAILER ON A SUSTAINED GRADE AT RECOMMENDED GROSS COMBINED WEIGHT(GCW)- 3.54/3.55/3.73 OR 4.10 AXLE RATIO
LIGHT TRUCK 1983-85 E-250/350 AND F-250/350
NOTE: Before proceeding with this article, verify that the engine is operating within the guidelines stated in the 6.9L Diesel Engine Diagnostic Guide (FPS-8433A). Form FPS- 8433C will replace FPS-8433A in the fourth quarter of 1985.
The subject concern may be due to vehicles upshifting at the low end (2700-2900 rpm) of the 1-2 and 2-3 rpm upshift tolerance band (2700-3400 rpm).
Installation of Upshift Kit (part number E5TZ-7A288-A) improves the early upshift condition by tightening the tolerance band resulting in a 3000 rpm minimum 1-2 and 2-3 wide open throttle shift. This results in slightly improved vehicle performance with a 2 to 4 mph increase in kickdown, and wide open throttle shift points.
Figure 18 - Control Valve Body Components:
Using the procedure shown in 1985 Light Truck Shop Manual, Volume A, Section 17-10, C-6 Automatic Transmission, install components included in the kit. For control valve body components and their location see Figure 18.
Installation of this kit on a vehicle with 3000 plus rpm on 1-2 and 2-3 wide open throttle shifts will have no effect on the subject concern.
NOTE: On vehicles with a 3.07 axle, it is not recommended to use this kit to resolve towing concerns. Low power towing complaints may indicate the customer purchased the wrong axle ratio for the truck's application.
PART NUMBER PART NAME CLASS
E5TZ-7A288-A Upshift Kit R
OTHER APPLICABLE ARTICLES: None
WARRANTY STATUS: Reimbursable within the provisions of the Warranty and Policy Manual.
OPERATION: SP7288A85 - Installation of Upshift Kit
TIME: 2.3 Hrs. - 4 x 2 3.4 Hrs. - 4 x 4
OPERATION: SP7288B85 - Extra time to road test after repair
TIME: 0.3 Hr.
OPERATION: SP7288C85 - Extra time for linkage adjustment
TIME: 0.3 Hr.
OPERATION: SP7288D85 - Extra time for band adjustment
TIME: 0.1 Hr.
OPERATION: SP7288E85 - Extra time if equipped with coupling shaft
TIME: 0.2 Hr. DLR. CODING: Basic Part No. 7A288 - Code: 53