Dodge RAM 1500 1998 Owner's Manual page 2020

DR
AUTOMATIC TRANSMISSION - 45RFE/545RFE (Continued)
Fig. 5 Valve Body Pressure Tap Adapter 8258-A
1 - 45RFE TRANSMISSION
2 - TOOL 8258-A
NOTE: The 45RFE/545RFE utilizes closed loop con-
trol of pump line pressure. The pressure readings
may therefore vary greatly but should always follow
line pressure.
Some common pressures that can be measured to
evaluate pump and clutch performance are the
upshift/downshift pressures, garage shift pressures,
and TCC pressure. The upshift/downshift pressure
for all shifts are shown in UPSHIFT PRESSURES
and DOWNSHIFT PRESSURES. In-gear maximum
pressure for each gear position is shown in IN-GEAR
PRESSURES. The garage shift pressure when per-
forming a N-R shift is 220 psi for 3.7L/4.7L equipped
vehicles and 250 psi for 5.7L equipped vehicles. The
garage shift pressure for the R-N shift is 120 psi. The
garage shift pressure for the N-1 shift is 135 psi for
3.7L/4.7L equipped vehicles and 165 psi for 5.7L
equipped vehicles. Torque converter lock-up pressure
is 120 psi for 3.7L/4.7L equipped vehicles and 125 psi
for 5.7L equipped vehicles.
UPSHIFT PRESSURES
ENGINE 1-2 2-3 2prime-3
150 125 125
5.7L
3.7L/ 120 120 120
4.7L
3-4 2prime-4 2-5 3-5
135 135 135 135
120 120 120 120
AUTOMATIC TRANSMISSION - 45RFE/545RFE
DOWNSHIFT PRESSURES
ENG- 5-
5-3
INE 4
135 135
5.7L
3.7L/ 120 120
4.7L
IN-GEAR PRESSURES
ENGINE 1 2
160 135
5.7L
3.7L/ 135 120
4.7L
DIAGNOSIS AND TESTING - AIR CHECKING
TRANSMISSION CLUTCH OPERATION
Air-pressure testing can be used to check transmis-
sion clutch operation. The test can be conducted with
the transmission either in the vehicle or on the work
bench, as a final check.
Air-pressure testing requires that the oil pan and
valve body be removed from the transmission. The
clutch apply passages are shown (Fig. 6).
Fig. 6 Air Pressure Test Passages
1 - LOW REVERSE CLUTCH
2 - 4TH CLUTCH
3 - 2ND CLUTCH
4 - OVERDRIVE CLUTCH
4-5 5 - UNDERDRIVE CLUTCH
6 - REVERSE CLUTCH
135
130
NOTE: The air supply which is used must be free of
moisture and dirt. Use a pressure of 30 psi to test
clutch operation.
Apply air pressure at each port. If the clutch is
functioning, a soft thump will be heard as the clutch
4-2 3-2
5-2 4-3 3-2
prime prime
135 135 135 135 135
120 120 120 120 120
2
3 4 5
prime
135 135 135 135
120 120 120 120
21 - 317
2 2-
3-1
prime-
1
1
135 135 135
120 120 120
NEUT- REV-
RAL ERSE
120 250
120 220