Ford 2003 Mustang Workshop Manual page 2369

Low In Neutral Only
Low In Overdrive Only
Low In 1st Position Only
Low In 2nd Only
Stall Speed Test
WARNING: Apply the parking brake firmly while carrying out each stall test.
CAUTION: Carry out line pressure test prior to carrying out stall test. If the line pressure is
low at stall, do not carry out stall test or further transmission damage will occur.
The stall speed test checks:
the torque converter clutch operation and installation.
the holding ability of the forward clutch.
the reverse clutch (the low-reverse bands).
the planetary one-way clutch.
the engine driveability.
Conduct this test with the engine coolant and transmission fluid at correct levels and at normal
operating temperature.
Apply the parking brake firmly for each stall speed test.
1. Find the specified stall rpm for the vehicle; see the stall speed diagnosis chart. Use a grease
pencil to mark the rpm on the dial of a tachometer.
Stall Speed
Application
3.8L engine
4.6L 2V engine
4.6L 4V MACH 1 engine 2,375 2,767
2. Connect a tachometer to the engine.
3. NOTE: If the rpm recorded by the tachometer exceeds the maximum limits, release the
accelerator pedal immediately because clutch or band slippage is indicated.
In each of the following ranges (D), 2, 1, R, press the accelerator pedal to the floor and hold it
· Reverse Clutch
· Valve Body
· Forward Clutch
· Valve Body
· Forward Clutch
· Valve Body
· Low/Reverse Servo
· Intermediate Clutch
· Valve Bodies
· Forward Clutch
Min. Max.
2,240 2,619
2,339 2,738