Dodge RAM TRUCK 1500 1995 Service Manual page 1332

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NV4500 MANUAL TRANSMISSION 21-49
TRANSMISSION IDENTIFICATION
The NV4500 transmission identification tag is at­
tached to the driver side PTO cover (Fig. 2).
The tag provides the transmission model number,
build date and part number. Be sure to reinstall the
I.D. tag if removed during service. The information
on the tag is essential to correct parts ordering.
PTO
COVER
J9221-14
Fig. 2 NV4500 Identification Tag Location
REQUIRED LUBRICANT—CAPACITY—FILL LEVEL
Required lubricant for the NV4500 is Mopar Man­
ual Transmission Lubricant, P/N 4637579. This is the
only lubricant recommended for use.
Dry fill lubricant capacity is approximately 3.78 li­
ters (8 pints).
Correct lubricant fill level is to the bottom edge of
the fill plug hole (Fig. 3). Check fill level only when
the transmission is level.
The transmission lubricant is drained through the
PTO cover bottom bolt hole (Fig. 3). It will be neces­
sary to apply sealer to the bolt threads before install­
ing it during a lubricant change.
FILL
PLUG
DRAIN
BOLT
PTO
COVER
J9421-210
GEAR RATIOS
NV4500 gear ratios are:
First gear = 5.61:1
Second gear = 3.04:1
Third gear = 1.67:1
Fourth gear = 1.00:1
Fifth gear = 0.74:1
Reverse gear = 5.61:1
SHIFT PATTERN
The NV4500 shift pattern is in a modified H pat­
tern (Fig. 4). Overdrive fifth and reverse gears are in
line and outboard of the first through fourth gear po­
sitions.
© 0 8
J9221-13
Fig. 3 NV4500 Fill Plug And Drain Bolt
Fig. 4 NV4500 Shift Pattern
MANUAL TRANSMISSION DIAGNOSIS
COMMON PROBLEM CAUSES
The majority of transmission malfunctions are a re­
sult of:
• insufficient lubricant
• incorrect lubricant
• misassembled or damaged internal components
• improper operation.
HARD SHIFTING
A low lubricant level, loose or worn shift lever, or
loose, damaged shift housing components are com­
mon causes of hard shifting. If hard shifting is also
accompanied by gear clash, synchronizer clutch and
stop rings, or mainshaft gear teeth may be worn or
damaged.
Hard shifting may also be caused by a loose, or
misaligned shift cover, or alignment dowels. Worn, or
damaged shift cover components will also cause hard
shifting. Any of the foregoing faults will cause com­
ponent bind and high shift efforts.
Misassembled synchro components will also cause
shift problems. Incorrectly installed synchro sleeves,
struts, or springs will all cause shift problems.
NOISY OPERATION
Transmission noise is most often a result of worn
or damaged components. Chipped, broken gear or
synchronizer teeth and brinnelled, spalled bearings
all cause noise.