Dodge RAM TRUCK 1500 1995 Service Manual page 1407

21 - 124 42RH/46RH/47RH TRANSMISSION DIAGNOSIS AND TESTING
TRANSMISSION DIAGNOSIS
CONDITION
P O S S I B L E C A U S E S
CORRECTION
FLUID CONTAMINATED
(DISCOLORED, FULL OF
SLUDGE AND/OR METAL
AND FRICTION MATERIAL
PARTICULAR)
1. If contamination occurred shortly
after overhaul, fluid cooler and lines
were not flushed and flow tested.
This is especially true when
original overhaul was to correct
a problem that generated a large
amount of debris, such as a gear
failure or a clutch pack failure.
Note: Flushing the cooler and lines
is mandatory after a failure of the
converter lockup clutch.
2. Incorrect fluid used in
transmission.
3. Main cooler in radiator is cracked,
allowing engine coolant to enter
transmission.
, Severe overload results in
overheat, fluid breakdown, and
accelerated wear, especially in
high ambient temperatures. Most
' frequent causes are:
• Vehicle is not properly equipped
for heavy duty service.
• Tow vehicle and boat or trailer
are both overloaded.
1. If contamination is severe, cooler flushing,
converter replacement, and another overhaul
may be necessary; particularly so if shift
problems were also present.
2. If transmission is operating properly,
drain fluid, reverse flush cooler and lines,
and change fluid and filter. However, if
shift problem has developed, converter
replacement and transmission overhaul may
be required.
3. Replace radiator (and cooler) and flush
lines. If problem was diagnosed early
enough, fluid and filter change may only be
necessary. If contamination period was
prolonged, overhaul and converter
replacement may be required.
4. Repair transmission, flush cooler, and
lines. Replace converter if necessary.
Install auxiliary cooler if needed. Also install
HD cooling system if needed. If tow vehicle
and unit being towed are both overloaded,
the only repair is to reduce the load to rated
limits. However, if trailer or boat is too large
for tow vehicle, the only option is for the
owner to move up to properly-equipped and
load-rated tow vehicle.
• Trailer or boat are too large for
tow vehicle (load exceeds rated
capacity of tow vehicle).
J9521-139