B&M 40227 TRANSPAK User Manual
Page 9
TROUBLESHOOTING GUIDE FOR THE FORD AOD TRANSMISSION
The troubleshooting guide is intended to help you identify possible causes of malfunctions that could be related
to incorrect assembly or adjustment of the transmission hydraulic system (valve body and accumulator) and or
mechanical controls. We recommend that you obtain an AOD service manual for problems related to the torque converter
or transmission hard parts.
Slow initial engagement
Low line pressure
Fluid level low
Harsh initial engagement
Engine idle too high
Loose U-joints or engine mounts
High line pressure
Sticking valves in valve body
2-3 accumulator valve damaged
No drive in any selector position
Valve body leaking internally
Valve body bolts loose
Sticking valves in valve body
Manual valve pin not engaged
Fluid level low
No drive forward, but has reverse
Worn or stuck governor
Valve body bolts loose
Sticking valves in valve body
Damaged 2-3 accumulator seal
Slips or chatters in 1
st
gear
TV linkage out of adjustment
(Selector in “OD”)
Low line pressure
Valve body bolts loose
Slips or chatters in 2
nd
gear
Defective intermediate clutch
(Selector in “OD”, OK in 1
st
)
Sticking valves in valve body
Slips or chatters in Reverse
Low line pressure
Valve body bolts loose
Starts in 2
nd
or 3
rd
Sticking governor
Sticking valves in valve body
Cross channel leaks between case or separator plate and valve body
Incorrect shift points
TV linkage out of adjustment
Worn governor
Sticking valves in valve body
NO 1-2 upshift
TV linkage out of adjustment
Governor valve sticking
Sticking valve in valve body
Mushy 1-2 shift
Out of tune engine
Defective intermediate clutch
TV linkage out of adjustment
Low line pressure
No 2-3 upshift
Defective direct clutch
Convertor damper hub broken
Sticking valve in valve body
Mushy 2-3 upshift
Defective 2-3 accumulator piston or seals
Low line pressure
Mushy or rough 3-4 upshift
Out of tune engine
Defective OD band or reverse drum
TV linkage out of adjustment
No forced down shifts
Defective clutch or band
TV linkage damaged or out of adjustment
Sticking valve in valve body
Transmission overheats
Too high idle speed or overheated engine
Restriction in cooler or lines
Converter overrun clutch seized
Sticking valves in valve body
Transmission noise
Relief valve resonance (buzzing)
Oil pump cavitation
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