1999 DODGE RAM towing
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Normal Service .......................... 6 ............... 7500
Severe Service ......................... (3) .............. 3000
Engine Oil Filter
Normal Service .......................... 12 ............ 15,000
Severe Service ......................... ( 3) .............. 6000
PCV Valve ( 6)
Normal Service .......................... 48 ............ 60,000
Severe Service ......................... ( 3) ............ 30,000
Spark Plugs
Normal Service .......................... 24 ............ 30,000
Severe Service ......................... ( 3) ............ 30,000
Spark Plug Wires
Normal Service .......................... 48 ............ 60,000
Severe Service ......................... ( 3) ............ 60,000
Automatic Transmission Fluid,
Filter & Band Adjustment
Normal Service .......................... 30 ............ 37,500
Severe Service ......................... ( 3) ............ 12,000
Manual Transmission Fluid ................ ( 7) ............... ( 7)
Transfer Case Fluid (4WD)
Normal Service .......................... 30 ............ 37,500
Severe Service ......................... ( 3) ............ 36,000
Front Differential Fluid (4WD) ( 8)
Severe Service ......................... ( 3) ............ 12,000
Rear Differential Fluid ( 8)
Severe Service ......................... ( 3) ............ 12,000
Repack Front Wheel Bearings (2WD)
Normal Service .......................... 18 ............ 22,500
Severe Service ......................... ( 3) ............ 21,000
( 1) - Light-duty vehicles apply to all 1500 models and 2500 except
5.9L diesel or 8.0L engines.
( 2) - Different interval may be required for normal and severe
service. Severe service is described as long periods of engine
idling, frequent short trip operation of less than 5 miles,
trailer towing, off-highway operation, snow removal operation,
or operating in dusty or excessively hot conditions.
( 3) - Monthly interval is not available from manufacturer.
( 4) - Inspect air filter every 15,000 miles and replace as necessary.
Replace at 30,000 miles unless previously replaced during
inspection.
( 5) - Replace coolant at 45,000 miles or 36 months whichever occurs
first. Replace coolant at 36 months regardless of mileage. After
first coolant change, replace coolant every 24 months or 30,000
miles thereafter.
( 6) - Inspect at scheduled interval and replace as necessary.
( 7) - Service interval is not available from manufacturer.
( 8) - Normal service interval is not available from manufacturer.
Manufacturer lists service schedule only under severe service
conditions.
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REPLACEMENT INTERVALS (RAM PICKUP - MEDIUM-DUTY - GASOLINE) ( 1)( 2) \
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Component Months Miles
Air Filter
Normal Service ...................... 30 ................ 30,000
Severe Service ...................... ( 3) ........... ( 4) 15,000
Coolant ............................... ( 5) .................. ( 5)
Engine Oil & Filter
Normal Service ....................... 6 .................. 6000
Severe Service ...................... ( 3) ................. 3000
Page 1185 of 1691
Spark Plugs
Normal Service ...................... 30 ................ 30,000
Severe Service ...................... (3) ............... 30,000
Spark Plug Wires
Normal Service ...................... 60 ................ 60,000
Severe Service ...................... ( 3) ............... 60,000
Automatic Transmission Fluid,
Filter & Band Adjustment
Normal Service ...................... 24 ................ 24,000
Severe Service ...................... ( 3) ............... 12,000
Manual Transmission Fluid ............. ( 6) .................. ( 6)
Transfer Case Fluid (4WD)
Normal Service ...................... 36 ................ 36,000
Severe Service ...................... ( 3) ............... 36,000
Front Differential Fluid (4WD) ( 7)
Severe Service ...................... ( 3) ............... 12,000
Rear Differential Fluid ( 7)
Severe Service ...................... ( 3) ............... 12,000
Repack Front Wheel Bearings (2WD)
Normal Service ....................... 18 ............... 18,000
Severe Service ...................... ( 3) ............... 24,000
( 1) - Medium-duty vehicles apply to 2500 and 3500 Calif. models with
8.0L engine.
( 2) - Different interval may be required for normal and severe
service. Severe service is described as long periods of engine
idling, frequent short trip operation of less than 5 miles,
trailer towing, off-highway operation, snow removal operation,
or operating in dusty or excessively hot conditions.
( 3) - Monthly interval is not available from manufacturer.
( 4) - Inspect air filter every 15,000 miles and replace as necessary.
Replace at 30,000 miles unless previously replaced during
inspection.
( 5) - Replace coolant at 36,000 miles or 36 months whichever occurs
first. Replace coolant at 36 months regardless of mileage. After
first coolant change, replace coolant every 24 months or 30,000
miles thereafter.
( 6) - Service interval is not available from manufacturer.
( 7) - Normal service interval is not available from manufacturer.
Manufacturer lists service schedule only under severe service
conditions.
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REPLACEMENT INTERVALS (RAM PICKUP - HEAVY-DUTY - GASOLINE) ( 1)( 2) \
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Component Months Miles
Air Filter
5.9L
Normal Service .................... 24 ................. 24,000
Severe Service ................... ( 3) ............. ( 4) 12,000
8.0L ............................... 12 ................. 12,000
Air Injection Pump Filter
Normal Service ..................... 24 ................. 24,000
Severe Service .................... ( 3) ............. ( 4) 12,000
Coolant ............................. ( 5) .................... ( 5)
EGR Valve (5.9L Only) ( 6)
Normal Service ..................... 60 ................. 60,000
Severe Service .................... ( 3) ................. 60,000
Engine Oil
Normal Service ..................... 6 .................... 6000
Severe Service .................... ( 3) ................... 3000
Engine Oil Filter
Page 1186 of 1691
5.9L
Normal Service .................... 12 ................. 12,000
Severe Service ................... (3) ................... 6000
8.0L
Normal Service .................... 6 .................... 6000
Severe Service ................... ( 3) ................... 3000
PCV Valve (5.9L Only)
Normal Service ..................... 60 ................. 60,000
Severe Service ( 7) ................ ( 3) ................. 30,000
Distributor Cap & Rotor (5.9L Only)
Normal Service ..................... 60 ................. 60,000
Severe Service .................... ( 3) ................. 60,000
Spark Plugs
Normal Service ..................... 30 ................. 30,000
Severe Service .................... ( 3) ................. 30,000
Spark Plug Wires
Normal Service ..................... 60 ................. 60,000
Severe Service .................... ( 3) ................. 60,000
Oxygen Sensor (5.9L Only)
Normal Service ..................... 82 ................. 82,500
Severe Service ..................... ( 3) ................ 82,500
Automatic Transmission Fluid,
Filter & Band Adjustment
Normal Service ..................... 24 ................. 24,000
Severe Service ..................... ( 3) ................ 12,000
Manual Transmission Fluid ............ ( 8) ................... ( 8)
Transfer Case Fluid (4WD)
Normal Service ..................... 36 ................. 36,000
Severe Service ..................... ( 3) ................ 18,000
Front Differential Fluid (4WD) ( 9)
Severe Service ..................... ( 3) ................ 12,000
Rear Differential Fluid ( 9) .......... ( 3) ................ 12,000
Repack Front Wheel Bearings
2WD
Normal Service .................... 24 ................. 24,000
Severe Service .................... ( 3) .................. 9000
4WD
Normal Service .................... 18 ................. 18,000
Severe Service .................... ( 3) .................. 6000
( 1) - Heavy-duty vehicles apply to 2500 and 3500 Federal models with
8.0L engine and all 3500 models with 5.9L gasoline engine.
( 2) - Different interval may be required for normal and severe
service. Severe service is described as long periods of engine
idling, frequent short trip operation of less than 5 miles,
trailer towing, off-highway operation, snow removal operation,
or operating in dusty or excessively hot conditions.
( 3) - Monthly interval is not available from manufacturer.
( 4) - Inspect filter every 12,000 miles and replace as necessary.
Replace at 24,000 miles unless previously replaced during
inspection.
( 5) - Replace coolant at 36,000 miles or 36 months whichever occurs
first. Replace coolant at 36 months regardless of mileage. After
first coolant change, replace coolant every 24 months or 30,000
miles thereafter.
( 6) - If equipped with EGR valve, clean EGR passages when replacing
EGR valve.
( 7) - Inspect and replace as necessary. Replace PCV valve at 60,000
miles.
( 8) - Service interval is not available from manufacturer.
( 9) - Normal service interval is not available from manufacturer.
Manufacturer lists service schedule only under severe service
conditions.
Page 1187 of 1691
![DODGE RAM 1999 Service Repair Manual \
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REPLACEMENT INTERVALS (RAM PICKUP - MEDIUM & H](/manual-img/12/56915/w960_56915-1186.png "DODGE RAM 1999 Service Repair Manual \
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REPLACEMENT INTERVALS (RAM PICKUP - MEDIUM & H")
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REPLACEMENT INTERVALS (RAM PICKUP - MEDIUM & HEAVY DUTY - 5.9L
DIESEL) (1)
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Component Months Miles
Air Filter ............................... ( 2) ............... ( 2)
Coolant .................................. ( 3) ............... ( 3)
Engine Oil & Filter
Normal Service .......................... 6 ............... 7500
Severe Service ......................... ( 4) .............. 3750
Fuel Filter
Normal Service .......................... 12 ............ 15,000
Severe Service ......................... ( 4) .............. 7500
Valve Clearance Adjustment ............... ( 5) ............... ( 5)
Automatic Transmission Fluid,
Filter & Band Adjustment
Normal Service .......................... 24 ............ 30,000
Severe Service ......................... ( 4) ............ 15,000
Manual Transmission Fluid ................ ( 6) ............... ( 6)
Transfer Case Fluid (4WD)
Normal Service .......................... 36 ............ 45,000
Severe Service ......................... ( 4) ............ 36,000
Front Differential Fluid (4WD) ( 7)
Severe Service ......................... ( 4) ............ 15,000
Rear Differential Fluid ( 7)
Severe Service ......................... ( 4) ............ 15,000
Repack Front Wheel Bearings (2WD)
Normal Service .......................... 24 ............ 30,000
Severe Service ......................... ( 4) ............ 30,000
Normal Service .......................... 48 ............ 48,000
Severe Service ......................... ( 4) ............ 48,000
( 1) - Different interval may be required for normal and severe
service. Severe service is described as long periods of engine
idling, frequent short trip operation of less than 5 miles,
trailer towing, off-highway operation, snow removal operation,
or operating in dusty or excessively hot conditions.
( 2) - Service interval is not available from manufacturer. Use filter-
minder on top of air cleaner housing to determine condition of
air filter. If filter-minder is in the Red zone, replace air
filter. Reset filter-minder by depressing button on top of
filter-minder.
( 3) - Replace coolant at 30,000 miles or 24 months whichever occurs
first. Replace coolant at 24 months regardless of mileage. After
first coolant change, replace coolant every 24 months or 30,000
miles thereafter.
( 4) - Monthly interval is not available from manufacturer.
( 5) - Does not require routine adjustments.
( 6) - Service interval is not available from manufacturer.
( 7) - Normal service interval is not available from manufacturer.
Manufacturer lists service schedule only under severe service
conditions.
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REPLACEMENT INTERVALS (RAM VAN & RAM WAGON) ( 1) \
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Component Months Miles
Air Filter
Normal Service ................... 24 ................... 30,000
Severe Service ................... ( 2) .............. ( 3) 15,000
Page 1188 of 1691
Coolant ............................ (4) ..................... ( 4)
Engine Oil
Normal Service .................... 6 ..................... 7500
Severe Service ................... ( 2) .................... 3000
Engine Oil Filter
Normal Service ................... 12 ................... 15,000
Severe Service ................... ( 2) .................... 6000
PCV Valve ( 5)
Normal Service ................... 48 ................... 60,000
Severe Service ................... ( 2) .................. 30,000
Spark Plugs
Normal Service ................... 24 ................... 30,000
Severe Service ................... ( 2) .................. 30,000
Spark Plug Wires
Normal Service ................... 48 ................... 60,000
Severe Service ................... ( 2) .................. 60,000
Automatic Transaxle Fluid,
Filter & Band Adjustment .......... ( 6) ..................... ( 6)
Rear Differential Fluid ( 7)
Severe Service ................... ( 2) .................. 12,000
Repack Front Wheel Bearings
Normal Service ................... 18 ................... 22,500
Severe Service ................... ( 2) .................. 21,000
( 1) - Different interval may be required for normal and severe
service. Severe service is described as long periods of engine
idling, frequent short trip operation of less than 5 miles,
trailer towing, or operating in dusty or excessively hot
conditions.
( 2) - Monthly interval is not available from manufacturer.
( 3) - Inspect air filter every 15,000 miles and replace as necessary.
Replace at 30,000 miles unless previously replaced during
inspection.
( 4) - Replace coolant at 45,000 miles or 36 months whichever occurs
first. Replace coolant at 36 months regardless of mileage. After
first coolant change, replace coolant every 24 months or 30,000
miles thereafter.
( 5) - Inspect at scheduled interval and replace as necessary.
( 6) - Normal service interval is not available from manufacturer.
Under severe service, change fluid, filter and adjust bands
every 12,000 miles.
( 7) - Normal service interval is not available from manufacturer.
Manufacturer lists service schedule only under severe service
conditions.
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BELT ADJUSTMENT (Tension In Lbs. (kg) Using Belt Tension Gauge) \
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Application New Belt (1) Used Belt
Caravan
2.4L
A/C & Generator ...................... 190 (86) ...... 115 (52\
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Power Steering ....................... 140 (64) ....... 90 (41\
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3.0L
A/C .................................. 150 (68) ....... 80 (36\
)
Generator & Power Steering ............. ( 2) .............. ( 2)
3.3L & 3.8L ............................. ( 2) .............. ( 2)
Dakota
2.5L .................................. 200 (91) ...... 160 (73\
)
3.9L, 5.2L & 5.9L ....................... ( 2) .............. ( 2)
Durango
3.9L, 5.2L & 5.9L ....................... ( 2) .............. ( 2)
Page 1190 of 1691
2.4L ............................. 170-225 psi (11.9-15.7 kg/cm)
3.0L ...................................... 178 psi (12.5 kg/cm)
3.3L ........................................................ ( 1)
Minimum Compression Pressure
Caravan, Town & Country, & Voyager .......... 100 psi (7.0 kg/cm
)
Dakota
2.5L ........................................................ ( 1)
3.9L, 5.2L & 5.9L .......................... 100 psi (7.0 kg/cm
)
Durango ..................................... 100 psi (7.0 kg/cm)
Ram Pickup
3.9L, 5.2L & 5.9L (Gasoline) & 8.0L ........ 100 psi (7.0 kg/cm
)
5.9L (Diesel) ............................................... ( 1)
Ram Van & Ram Wagon ......................... 100 psi (7.0 kg/cm
)
Maximum Variation Between Cylinders
Caravan, Town & Country & Voyager ..................... 25 Percent
Dakota
2.5L ........................................ 30 psi (2.1 kg/cm
)
3.9L, 5.2L & 5.9L ........................................... ( 1)
Durango ...................................................... ( 1)
Ram Pickup, Ram Van & Ram Wagon .............................. ( 1)
( 1) - Information is not available from manufacturer.
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VALVE CLEARANCE
Gasoline Models
All engines are equipped with hydraulic lifters. No
adjustments are required.
5.9L Diesel (Ram Pickup)
Valve adjustment is recommended every 150 months or 150,000
miles during normal service, every 135,000 miles during severe
service. Severe service is described as frequent short trip operation
of less than 5 miles, long periods of engine idling, trailer towing,
police, taxi, local delivery service, or operating in dusty or
excessively hot conditions. See VALVE CLEARANCE SPECIFICATIONS
(DIESEL) table.
VALVE CLEARANCE SPECIFICATIONS (DIESEL) ( 1)
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Application In. (mm)\
Intake Valve ............................................ .010 (.25)\
Exhaust Valve ........................................... .020 (.51)\
(1) - Adjust valves with engine temperature less than 140
F (60C). \
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IGNITION SYSTEM
IGNITION COIL
IGNITION COIL RESISTANCE - Ohms @ 70-80F (21-27C) \
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Application Primary Secondary
Caravan
2.4L
Diamond ( 1)( 2) ............... .53-.65 .......... 11,500-13,500
Weastec ( 1) .................. .45-.65 .......... 10,900-14,700
3.0L ............................. ( 3) ..................... ( 3)
Page 1495 of 1691
Fig. 2: Identifying Oil Pan Gasket (36RH, 46RE & 47RE)
LUBRICATION
SERVICE INTERVALS
Transmission
Check transmission fluid level when performing other
underhood services. Under normal service conditions or severe service
conditions change transmission fluid, adjust bands and replace
transmission filter at specified interval. See TRANSMISSION SERVICING
INTERVALS table. Severe service conditions are conditions such as long
periods of engine idling, trailer towing, off-highway operation, snow
removal, or operating in dusty or excessively hot conditions.
TRANSMISSION SERVICING INTERVALS
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Application Months Miles
Dakota & Durango
Normal Service ........................ 30 .............. 37,500
Severe Service ........................ ( 1) ............. 12,000
Page 1496 of 1691
Ram Pickup
Gasoline Models
Light-Duty (2)
Normal Service ..................... 30 .............. 37,500
Severe Service ..................... ( 1) ............. 12,000
Medium-Duty & Heavy-Duty
Normal Service ..................... 24 .............. 24,000
Severe Service ..................... ( 1) ............. 12,000
Diesel Models
Normal Service ....................... 24 .............. 24,000
Severe Service ....................... ( 1) ............. 12,000
Ram Van/Wagon
Normal Service ........................ ( 3) ................ ( 3)
Severe Service ........................ ( 1) ............. 12,000
( 1) - Monthly interval is not available from manufacturer.
( 2) - Light-duty applies to all 1500 models and 2500 models except
5.9L diesel or 8.0L engines. Medium-duty applies to 2500 and
3500 California models with 8.0L engine. Heavy-duty applies to
2500 and 3500 Federal models with 8.0L engine and all 3500
models with 5.9L gasoline engine.
( 3) - Normal service interval is not available from manufacturer.
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Transfer Case
Check transfer case fluid level when performing other
underhood services. Under normal service conditions or severe service
conditions change transfer case fluid at specified interval. See
TRANSFER CASE SERVICING INTERVALS table. Severe service conditions are
conditions such as long periods of engine idling, trailer towing, off-
highway operation, snow removal, or operating in dusty or excessively
hot conditions.
TRANSFER CASE SERVICING INTERVALS
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Application Months Miles
Dakota
Normal Service ....................... 30 ............... 37,500
Severe Service ....................... ( 1) .............. 36,000
Ram Pickup
Gasoline Models
Light-Duty ( 2)
Normal Service .................... 30 ............... 37,500
Severe Service .................... ( 1) .............. 36,000
Medium-Duty & Heavy-Duty
Normal Service .................... 36 ............... 36,000
Severe Service .................... ( 1) .............. 36,000
Diesel Models
Normal Service ...................... 36 ............... 36,000
Severe Service ...................... ( 1) .............. 36,000
( 1) - Monthly interval is not available from manufacturer.
( 2) - Light-duty applies to all 1500 models and 2500 models except
5.9L diesel or 8.0L engines. Medium-duty applies to 2500 and
3500 California models with 8.0L engine. Heavy-duty applies to
2500 and 3500 Federal models with 8.0L engine and all 3500
models with 5.9L gasoline engine.
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Power Take-Off (PTO) Adapter (Ram Pickup 2WD 2500 & 3500)
Check PTO adapter fluid level when performing other underhood
services. Service interval is not available from manufacturer.