Dodge RAM TRUCK 1500 1995 Service Manual page 1429

21 - 141 42RH/46RH/47RK TRANSMISSION IN-VEHICLE SERVICE
B R
• 4 turns on 42RH
• 2 turns on 46RH
» 3 turns on 47RH
(6) Hold adjusting screw in place and tighten lock-
nut to 34 N-m (25 ft. lbs.) torque,
(7) Position new gasket on oil pan and install pan
on transmission. Tighten pan bolts to 17 N-m (13 ft.
lbs.) torque.
(8) Lower vehicle and refill transmission with Mo­
par ATF Plus, Type 7176 fluid.
Fig. 15 Rear Band Adjustment Screw Location
SPEEDOMETER SERVICE
Rear axle gear ratio and tire size determine speed­
ometer pinion requirements. If the pinion must be re­
placed, refer to the parts catalogue information for
the correct part.
(1) Raise vehicle.
(2) Disconnect wires from vehicle speed sensor.
(3) Remove adapter clamp and screw (Fig. 16).
(4) Remove speed sensor and speedometer adapter
as assembly.
(5) Remove speed sensor retaining screw and re­
move sensor from adapter.
(6) Remove speedometer pinion from adapter.
(7) Inspect sensor and adapter O-rings (Fig. 16).
Remove and discard O-rings if worn or damaged.
(8) Inspect terminal pins in speed sensor. Clean
pins with Mopar electrical spray cleaner if dirty or
oxidized. Replace sensor if faulty, or pins are loose,
severely corroded, or damaged.
SPEEDOMETER INSTALLATION AND
INDEXING
(1) Thoroughly clean adapter flange and adapter
mounting surface in housing. Surfaces must be clean
for proper adapter alignment and speedometer oper­
ation.
(2) Install new O-rings on speed sensor and speed­
ometer adapter if necessary.
(3) Lubricate sensor and adapter O-rings with
transmission fluid.
(4) Install vehicle speed sensor in speedometer
adapter. Tighten sensor attaching screw to 2-3 N-m
(15-27 in. lbs.) torque.
(5) Install speedometer pinion in adapter.
(6) Count number of teeth on speedometer pinion.
Do this before installing assembly in housing. Then
lubricate pinion teeth with transmission fluid.
(7) Note index numbers on adapter body (Fig. 17).
These numbers will correspond to number of teeth on
pinion.
(8) Install speedometer assembly in housing.
(9) Rotate adapter until required range numbers
are at 6 o-clock position. Be sure range index num­
bers correspond to number of teeth on pinion gear.
(10) Install speedometer adapter clamp and retain­
ing screw. Tighten clamp screw to 10-12 N-m (90-110
in. lbs.) torque.
(11) Connect wires to vehicle speed sensor.
(12) Lower vehicle and top off transmission fluid
level if necessary.
PARK/NEUTRAL POSITION SWITCH
The center terminal of the park/neutral position
switch is the starter circuit terminal. It provides the
ground for the starter solenoid circuit through the se­
lector lever in Park and Neutral positions only. The
outer terminals on the switch are for the backup
lamp circuit.
SWITCH WSBW
To test the switch, remove the wiring connector.
Then test continuity between the center terminal and
the transmission case. Continuity should exist only
when the transmission is in Park or Neutral.
Shift the transmission into reverse and test conti­
nuity at the switch outer terminals. Continuity
should exist only when the transmission is in Re­
verse. Continuity should not exist between the outer
terminals and the case.
Check gearshift linkage adjustment before replac­
ing a switch that tests bad.
SWITCH REPLACEMENT
(1) Raise vehicle and position drain pan under
switch.
(2) Disconnect switch wires.
(3) Remove switch from case.
(4) Move shift lever to Park and Neutral positions.
Verify that switch operating lever fingers are cen­
tered in switch opening in case (Fig. 18).
(5) Install new seal on switch and install switch in
case. Tighten switch to 34 N-m (25 ft. lbs.) torque.
(6) Test continuity of new switch with 12V test
lamp.
(7) Connect switch wires and lower vehicle.
(8) Top off transmission fluid level.