Dodge Nitro. Manual — part 339

25. Remove clutch K1 (1).

Fig. 45: Removing/Installing Holding Clutch B1 and Oil Pump
Courtesy of CHRYSLER LLC

26. Unscrew Torx® socket bolts (4) and remove oil pump (6). Screw two opposed bolts into the oil pump

housing and press the oil pump out of the converter housing by applying light blows with a plastic
hammer. See Fig. 45.

27. Remove and discard the torque converter hub seal and the oil pump outer o-ring seal from the oil pump.

28. Unscrew Torx® socket bolts (1) and remove multiple-disc holding clutch B1 (5) from converter housing.

Screw two opposed bolts into the multiple-disc holding clutch B1 (5) and separate from the converter
housing by applying light blows with a plastic hammer. See Fig. 45.

29. Detach intermediate plate (3) from converter housing (2). See Fig. 45.

1 - BOLTS - M6X32

4 - BOLTS - M8X35

2 - CONVERTER HOUSING

5 - HOLDING CLUTCH B1

3 - INTERMEDIATE PLATE

6 - OIL PUMP

2007 Dodge Nitro R/T

2007 AUTOMATIC TRANSMISSION NAG1 - Service Information - Nitro

Fig. 46: Identifying B2, B3 and Parking Gear
Courtesy of CHRYSLER LLC

30. Remove multiple-disc pack B3 (2) and spring washer (3) by removing snap-ring (1) in transmission

housing. To facilitate removal of the snap-ring (1), compress the multiple-disc pack B3 (2). Note which
clutch disc is removed just prior to the spring washer (3) for re-assembly. If the clutch discs are re-used,
this disc must be returned to its original position on top of the spring washer. See Fig. 46.

31. Unscrew Torx® socket bolts (7). See Fig. 46.

32. Remove multiple-disc holding clutch B2 (4) from transmission housing. The externally toothed disc

carrier for multiple-disc holding clutch B2 is also the piston for multiple-disc holding clutch B3. See Fig.
46.

33. Remove parking lock gear (5). See Fig. 46.

1 - SNAP-RING

5 - PARK GEAR

2 - HOLDING CLUTCH B3 DISCS

6 - TRANSMISSION HOUSING

3 - SPRING WASHER

7 - BOLTS - M8X60

4 - HOLDING CLUTCH B2

2007 Dodge Nitro R/T

2007 AUTOMATIC TRANSMISSION NAG1 - Service Information - Nitro

FLUID AND FILTER

DESCRIPTION

FLUID LEVEL CONTROL

Fig. 182: Gearset Chamber, Oil Gallery, Shell Of Electrohydraulic Unit, Electrohydraulic Unit, Float &
Opening
Courtesy of CHRYSLER LLC

The oil level control is located on the electrohydraulic unit (4) and consists of the float (5) which is integrated
into the electrohydraulic unit. The float is positioned to plug the opening (6) between the oil gallery (2) and
gearset chamber (1) so that the rotating gearsets do not splash about in oil as the oil level rises. The oil level
control reduces power loss and prevents oil from being thrown out of the transmission housing at high oil
temperatures. See Fig. 182.

OPERATION

FLUID LEVEL CONTROL

1 - GEARSET CHAMBER
2 - OIL GALLERY
3 - SHELL OF ELECTROHYDRAULIC UNIT
4 - ELECTROHYDRAULIC UNIT
5 - FLOAT
6 - OPENING

2007 Dodge Nitro R/T

2007 AUTOMATIC TRANSMISSION NAG1 - Service Information - Nitro

2007 Dodge Nitro R/T

2007 AUTOMATIC TRANSMISSION NAG1 - Service Information - Nitro

Fig. 183: Gearset Chamber, Oil Gallery, Shell Of Electrohydraulic Unit, Electrohydraulic Unit, Float &
Opening
Courtesy of CHRYSLER LLC

With low oil levels, the lubricating oil which flows constantly out of the gearset, flows back to oil gallery (2)
though the opening (6) If the oil level rises, the oil presses the float (5) against the housing opening (6). The
float (5) therefore separates the oil gallery (2) from the gearset chamber (1). The lubricating oil which continues
to flow out of the gearsets is thrown against the housing wall, incorporated by the rotating parts and flows back
into the oil gallery (2) through the upper opening (arrow). See Fig. 183.

DIAGNOSIS AND TESTING

CAUSES OF BURNT FLUID

Burnt, discolored fluid is a result of overheating which has three primary causes.

Internal clutch slippage, usually caused by low line pressure, inadequate clutch apply pressure, or clutch
seal failure.

A result of restricted fluid flow through the main and/or auxiliary cooler. This condition is usually the
result of a faulty or improperly installed drainback valve, a damaged oil cooler, or severe restrictions in
the coolers and lines caused by debris or kinked lines.

Heavy duty operation with a vehicle not properly equipped for this type of operation. Trailer towing or

1 - GEARSET CHAMBER
2 - OIL GALLERY
3 - SHELL OF ELECTROHYDRAULIC UNIT
4 - ELECTROHYDRAULIC UNIT
5 - FLOAT
6 - OPENING

2007 Dodge Nitro R/T

2007 AUTOMATIC TRANSMISSION NAG1 - Service Information - Nitro