F 250 2WD Pickup V8-6.9L DSL (1985)
September, 1985. Installation of the upshift kit (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 slightly improves vehicle performance with a 2-4 mph (3-6 km/h) increase in
kickdown and wide open throttle shift points.
NOTE:
On vehicles equipped with the 3.07 axle ratio, it is not recommended to use this kit to resolve towing concerns. Low power towing
concerns may indicate the wrong axle ratio for the truck's application.
11.
Check manual transmission gear ratios for the customer's application. Two different sets of gear ratios have been used in the T19 manual
transmissions behind the 6.9L diesel engine. The 1983 model year through March, 1984 production used a wide ratio gear set (5.11, 3.03, 1.79 and
1.00). This wide ratio gear set resulted in performance concerns on trailer tow vehicles with regards to the wide split between third and fourth
gears. The vehicle could be accelerated in third gear up to 3400 engine RPM shifted to fourth gear and lose speed forcing a downshift back to third
gear. TSB Article Number 84-4-29 outlines changes from a wide ratio to a close ratio gear set. The vehicles produced after March, 1984 use a
close ratio gear (4.02, 2.41, 1.41, 1.00).
This close ratio gear set improved vehicle performance on the highway with a trailer or heavy load. Starting gradability is reduced. Vehicles used
as wreckers or other start-up applications, but not used for highway trailer towing and built after March, 1984, can be changed to a wide ratio gear
set.
12.
Check rear axle ratio for the customer's application. Three different axle ratios have been used on vehicles equipped with the 6.9L diesel engine.
The 3.07 axle ratio is used for vehicles at empty to light loads or light trailer towing. The 3.54/3.55 axle ratios are used for vehicles used at empty
to moderate loads or for occasional or light trailer towing (Max. GCW 12,000 lbs.). The 4.10 axle ratio is recommended for trailer towing,
performance intensive and high altitude applications (Max. GCW 14,000 lbs.).
NOTE:
Changes in axle ratio to improve vehicle performance may reduce fuel economy.
Other things that may add to the customer's belief of poor engine performance are: 1) dual versus single-rear wheels causing added rolling resistance and
increased wind resistance of the vehicle with dual rear wheels, and 2) four-wheel versus twowheel drive vehicles causing loss of horsepower because of
the additional drivetrain components, additional rolling resistance, weight, and increased frontal area of the four-wheel drive vehicle, 3) auxiliary
equipment such as PTO operated equipment, larger alternators, air conditioning systems that are in operation during vehicle acceleration causing reduced
performance, and 4) added coolers or equipment mounted in front of the radiator reduce the cooling system's efficiency resulting in increased cooling fan
loads which reduce vehicle performance.
USE OF CHARTS
^
For use on 1983-85 models with 3.07 or 3.08 axle ratios and 1983-87 models with 3.54, 3.55, or 4.10 axle ratios:
Chart
Transmission
Axle Ratio
A
C6
3.07/3.08
B
C6
3.54/3.55
C
C6
4.10
D
M4 (close ratio)
3.07/3.08
E
M4 (close ratio)
3.54/3.55
F
M4 (close ratio)
4.10
G
M4 (wide ratio)
3.07/3.08
H
M4 (wide ratio)
3.54/3.55
J
M4 (wide ratio)
4.10
^
Charts must not be used at altitudes higher than 2000 feet (50.8 meters) above sea level or 95~ (35~C) ambient temperatures. The 6.9L diesel
engine loses torque at a rate of 10 ft.lbs. per 1000 feet (25.4 meters) above sea level. This loss will affect vehicle performance. The charts are to be
used on 6.9L sea level calibrations only. No high altitude calibration charts will be published because of low volume and vehicle complexity
requirements for use in high altitude applications.
^
Do not test with trailer. Trailers represent both an increased frontal area and rolling load and are not covered in the charts.
^
Vehicle that equals or is less than the time noted in the charts meets acceptable performance.
^
Charts cover vehicle weights only up to Ford Motor Company's maximum recommendations for a particular chassis and axle ratio. Frontal areas in
excess of the Company's recommendations are included only because it is recognized that the frontal area of a complaint vehicle cannot always be
reduced for testing. Operating the vehicle with a frontal area in excess of the Company's recommendation will affect the vehicle's performance,
fuel economy and durability.
PART NUMBER
PART NAME
CLASS
E7TZ-9725-A
Accelerator Pedal
B
E5TZ-7B200-A
Vacuum Regulator Valve
B
