FLUID AND FILTER
DIAGNOSIS AND TESTING
EFFECTS OF INCORRECT FLUID LEVEL
A low fluid level allows the pump to take in air along with the fluid. Air in the fluid will cause fluid pressures to
be low and develop slower than normal. If the transmission is overfilled, the gears churn the fluid into foam.
This aerates the fluid and causing the same conditions occurring with a low level. In either case, air bubbles
cause fluid overheating, oxidation, and varnish buildup which interferes with valve and clutch operation.
Foaming also causes fluid expansion which can result in fluid overflow from the transmission vent or fill tube.
Fluid overflow can easily be mistaken for a leak if inspection is not careful.
CAUSES OF BURNT FLUID
Burnt, discolored fluid is a result of overheating which has two primary causes.
1. A result of restricted fluid flow through the main and auxiliary cooler. This condition is usually the result
of a damaged main cooler, or severe restrictions in the coolers and lines caused by debris or kinked lines.
2. Heavy duty operation with a vehicle not properly equipped for this type of operation. Trailer towing or
similar high load operation will overheat the transmission fluid if the vehicle is improperly equipped.
Such vehicles should have an auxiliary transmission fluid cooler, a heavy duty cooling system, and the
engine/axle ratio combination needed to handle heavy loads.
FLUID CONTAMINATION
Transmission fluid contamination is generally a result of:
Adding incorrect fluid.
Failure to clean dipstick and fill tube when checking level.
Engine coolant entering the fluid.
Internal failure that generates debris.
Overheat that generates sludge (fluid breakdown).
Failure to replace contaminated converter after repair.
The use of non-recommended fluids can result in transmission failure. The usual results are erratic shifts,
slippage, abnormal wear and eventual failure due to fluid breakdown and sludge formation. Avoid this
condition by using recommended fluids only.
The dipstick cap and fill tube should be wiped clean before checking fluid level. Dirt, grease and other foreign
material on the cap and tube could fall into the tube if not removed beforehand. Take the time to wipe the cap
and tube clean before withdrawing the dipstick.
Engine coolant in the transmission fluid is generally caused by a cooler malfunction. The only remedy is to
replace the radiator as the cooler in the radiator is not a serviceable part. If coolant has circulated through the
transmission, an overhaul is necessary.
2007 Dodge Nitro R/T
2007 AUTOMATIC TRANSMISSION 42RLE - Service Information - Nitro
2007 Dodge Nitro R/T
2007 AUTOMATIC TRANSMISSION 42RLE - Service Information - Nitro
The torque converter should be replaced whenever a failure generates sludge and debris. This is necessary
because normal converter flushing procedures will not remove all contaminants.
STANDARD PROCEDURE
TRANSMISSION FILL
To avoid overfilling transmission after a fluid change or overhaul, perform the following procedure:
1. Remove dipstick and insert clean funnel in transmission fill tube.
2. Add following initial quantity of Mopar® ATF +4, Automatic Transmission Fluid, to transmission:
If only fluid and filter were changed, add 6 pints (3 quarts) of ATF +4 to transmission.
If transmission was completely overhauled, or torque converter was replaced or drained, add 10
pints (5 quarts) of ATF +4 to transmission.
3. Apply parking brakes.
4. Start and run engine at normal curb idle speed.
5. Apply service brakes, shift transmission through all gear ranges then back to NEUTRAL, set parking
brake, and leave engine running at curb idle speed.
6. Remove funnel, insert dipstick and check fluid level. If level is low, add fluid to bring level to MIN
mark on dipstick. Check to see if the oil level is equal on both sides of the dipstick. If one side is
noticably higher than the other, the dipstick has picked up some oil from the dipstick tube. Allow the oil
to drain down the dipstick tube and re-check.
7. Drive vehicle until transmission fluid is at normal operating temperature.
8. With the engine running at curb idle speed, the gear selector in NEUTRAL, and the parking brake
applied, check the transmission fluid level.
9. Add fluid to bring level up to MAX arrow mark.
When fluid level is correct, shut engine off, release park brake, remove funnel, and install dipstick in fill tube.
FLUID LEVEL CHECK
The transmission sump has a dipstick to check oil similar to most automatic transmissions. It is located on the
left side of the engine. Be sure to wipe all dirt from dipstick handle before removing.
The torque converter fills in both the PARK and NEUTRAL positions. Place the selector lever in PARK to be
sure that the fluid level check is accurate. The engine should be running at idle speed for at least one
minute, with the vehicle on level ground. At normal operating temperature (approximately 82°C or 180°F),
the fluid level is correct if it is in the HOT region (cross-hatched area) on the oil level indicator. The fluid level
should be in COLD region at 21°C (70°F) fluid temperature. Adjust fluid level as necessary. Use only Mopar®
ATF+4, Automatic Transmission Fluid.
CAUTION: Do not overfill transmission, fluid foaming and shifting problems can
result.
2007 Dodge Nitro R/T
2007 AUTOMATIC TRANSMISSION 42RLE - Service Information - Nitro
FILL TUBE EQUIPPED WITH INDICATOR
Fig. 148: 42RLE Fluid Temperature Chart
Courtesy of CHRYSLER LLC
1. Start engine and apply parking brake.
2. Connect scan tool and select transmission.
3. Select sensors.
4. Read the transmission temperature value.
5. Compare the fluid temperature value with the chart.
6. Adjust transmission fluid level shown on the dipstick according to the 42RLE Fluid Temperature Chart.
See Fig. 148 . Use only Mopar® ATF+4, Automatic Transmission Fluid.
7. Check transmission for leaks.
CAPPED FILL TUBE
1. Verify that the vehicle is parked on a level surface.
2. Remove the dipstick tube cap.
NOTE: Engine and Transmission should be at normal operating temperature before
performing this procedure.
WARNING: There is a risk of accident from vehicle starting off by itself when
engine running. There is a risk of injury from contusions and burns
if you insert your hands into the engine when it is started or when it
2007 Dodge Nitro R/T
2007 AUTOMATIC TRANSMISSION 42RLE - Service Information - Nitro
3. Actuate the service brake. Start engine and let it run at idle speed in selector lever position "P".
4. Shift through the transmission modes several times with the vehicle stationary and the engine idling
5. Warm up the transmission, wait at least 2 minutes and check the oil level with the engine running. Push
the Oil Dipstick 9336 into transmission fill tube until the dipstick tip contacts the oil pan and pull out
again, read off oil level, repeat if necessary.
Fig. 149: NAG1 Transmission Fill Graph
Courtesy of CHRYSLER LLC
6. Check transmission oil temperature using the appropriate scan tool.
7. The transmission Oil Dipstick 9336 has indicator marks every 10mm. Determine the height of the oil
level on the dipstick and using the height, the transmission temperature, and the Transmission Fluid
Graph, determine if the transmission oil level is correct.
8. Add or remove oil as necessary and recheck the oil level.
9. Once the oil level is correct, install the dipstick tube cap.
FLUID/FILTER SERVICE
is running. Secure vehicle to prevent it from moving off by itself.
Wear properly fastened and close-fitting work clothes. Do not touch
hot or rotating parts.
NOTE: The dipstick will protrude from the fill tube when installed.
NOTE: The true transmission oil temperature can only be read by a scan tool in
REVERSE or any forward gear position.
NOTE: Only fluids of the type labeled Mopar® ATF+4, Automatic Transmission Fluid,
should be used in the transmission sump. A filter change should be made at the
2007 Dodge Nitro R/T
2007 AUTOMATIC TRANSMISSION 42RLE - Service Information - Nitro
1. Raise vehicle on a hoist. Place a drain container with a large opening, under transmission oil pan.
Fig. 150: Locating Oil Pan Bolts & Pressure Ports
Courtesy of CHRYSLER LLC
time of the transmission oil change. The magnet (on the inside of the oil pan)
should also be cleaned with a clean, dry cloth.
NOTE: If the transmission is disassembled for any reason, the fluid and filter should be
changed.
2007 Dodge Nitro R/T
2007 AUTOMATIC TRANSMISSION 42RLE - Service Information - Nitro
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2007-2011 Dodge Nitro Service & Repair Manual
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Description
The Dodge Nitro 2007-2011 Service Repair Manual provides essential maintenance schedules and repair procedures for your vehicle. It is a comprehensive manual containing all the information needed to repair, maintain, rebuild, refurbish, or restore your Dodge Nitro.
Whether you are a professional mechanic or a DIY enthusiast, this manual is a valuable resource. The index includes detailed sections covering general information, periodic maintenance, engine, fuel system, cooling system, electrical system, chassis, services information, and emission control information.
By using this service manual, you can address vehicle issues in a cost-effective manner. It offers step-by-step instructions based on complete machine disassembly, accompanied by numerous photos and illustrations to guide you through each service and repair procedure.
This complete Service Repair Manual is written in English and is fully printable. It is compatible with all versions of Windows and Mac, and can be instantly delivered. The manual also allows zooming in and out for detailed viewing. It is a reliable source of information that will enhance your understanding of your vehicle and help prevent future problems.
From engine servicing to chassis assembly, this manual covers a wide range of topics including wiring diagrams, periodic maintenance, fuel and lubrication systems, electrical systems, chassis, suspension, and much more. It is a valuable tool for maintaining and servicing your Dodge Nitro.
