1999 DODGE RAM torque

Center Carrier Bearing Bolt ................................ 50 (68)\
Pinion Nut (Minimum Torque) .............................. 210 (285\
)
Ring Gear Bolt (1)
Dakota
8 1/4" ................................................. 75 (102)\
9 1/4" ................................................. 115 (157)\
Ram Pickup ............................................... 70 (95)\
Ram Van/Wagon ........................................... 75 (102)\
Shock Absorber Nut ......................................... 60 (81)\
"U" Bolt Nut
8 1/4" Ring Gear
Dakota 2WD .............................................. 65 (88)\
Dakota 4WD ............................................ 110 (149)\
9 1/4" Ring Gears
1/2" X 20 Bolt Thread ................................... 65 (88)\
9/16" X 18 Bolt Thread ................................ 110 (149)\
"U" Joint Strap Bolt
Diesel Models ............................................ 25 (34)\
Gasoline Models .......................................... 14 (19)\
Wheel Lug Nut
Dakota .......................................... 85-110 (115-149)\
Ram Pickup
5-Lug .......................................... 80-110 (108-149)\
8-Lug (Single Wheel) .......................... 120-150 (163-203\
)
8-Lug (Dual Wheel) ............................ 130-160 (176-217\
)
Ram Van/Wagon
1/2" Stud
60-Degree Cone ............................... 80-110 (108-149)\
90-Degree Cone ............................... 85-115 (115-156)\
5/8" Stud
90-Degree Cone .............................. 175-225 (237-305)\
Flanged Nut ................................. 300-350 (407-474)\
INCH Lbs. (N.m)
Adjuster Lock Bolt ......................................... 90 (10)\
Pinion Shaft Lock Bolt ( 2) ................................. 96 (11)
( 1) - Left-hand threaded bolts.
( 2) - Apply Loctite to bolt threads.









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DRIV E A XLE - T R AC -L O K

1999 D odge P ic ku p R 1500
1998-99 DRIVE AXLES
CHRY - Trac-Lok
Dakota, Ram Pickup, Ram Van/Wagon
IDENTIFICATION
TRAC-LOK DIFFERENTIAL APPLICATION (REAR AXLE)








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Model Ring Gear Axle
Size Model
Dakota .................... 8 1/4" ........................... ( 1)
Ram Pickup ............ 9 3/4" ....................... 248 RBI
10 3/4" ....................... 267 RBI
11" ....................... 286 RBI
Ram Van/Wagon ............. 9 3/4" ....................... 248 RBI
( 1) - Manufacturer does not designate axle model.









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NOTE: For rear axles with limited-slip differentials, see POWER-LOK
- RAM PICKUP article.
DESCRIPTION & OPERATION
A Rear Beam-Design Iron (RBI) axle is an iron casting axle
and differential housing with axle shaft tubes extending from either
side. Tubes are pressed in to form a one-piece full-floating axle
housing.
Trac-Lok differential assembly is optional equipment. The
Trac-Lok differential assembly is a limited-slip type differential. It
is similar in operation to a conventional type differential, except
for 2 clutch packs located at the side gears in the differential case.
See Fig. 1 . Clutch packs provide differential action when required for
turning corners, and transmit equal torque to both wheels when driving
straight ahead.
AXLE RATIO & IDENTIFICATION
Axle ratio can be identified by axle identification tag
attached to axle housing cover. See AXLE RATIO SPECIFICATIONS table.
AXLE RATIO SPECIFICATIONS









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Application Ratio
Dakota ..................................... 3.21:1, 3.55:1 & 3.92:1
Ram Pickup
248 RBI .......................................... 3.55:1 & 4.10:1
267 & 286 RBI .................................... 3.54:1 & 4.10:1
Ram Van/Wagon ...................................... 3.55:1 & 4.10:1









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WARNING: Whenever rotating wheels, DO NOT use engine to rotate wheels
unless both rear wheels are off the ground and vehicle is
securely supported.

TESTING
NOTE: Trac-Lok differential can be tested without removing
differential case from axle housing.
1) Place blocks under both front wheels. Ensure engine is off
and transmission is in Neutral. Release parking brake. Raise one rear
wheel until it is completely clear of the floor. Remove wheel. Install
Adapter (6790) to wheel studs and tighten securely.
2) Using torque wrench on adapter, rotate axle and record
torque required. Repeat procedure for remaining rear wheel position.
If rotational torque for either rear wheel is less than 30 ft. lbs.
(40.1 N.m) or greater than 200 ft. lbs. (271 N.m), Trac-Lok unit mus\
t
be replaced or repaired.
REMOVAL & INSTALLATION
Servicing procedure is same as that used for standard
differential. See RBI FULL FLOATING AXLES article for servicing
procedures.
OVERHAUL
DIFFERENTIAL CARRIER
Disassembly
1) Place appropriate side gear holding tool in soft-jaw vise.
Position differential carrier on holding tool. Remove ring gear, if
necessary. Ring gear removal is only necessary when ring gear is being
replaced.
2) Remove roll pin holding pinion mate shaft into housing.
Remove pinion gear mate shaft. A drift and hammer can be used if
necessary. See Fig. 1.
3) Install appropriate Step Plate on lower side gear. Install
appropriate threaded forcing screw into upper side gear. See Fig. 2.
4) Thread Forcing Screw into threaded adapter disc until
forcing screw is centered in threaded adapter disc. Perform STEP 1
shown in illustration. See Fig. 2.
5) Place small screwdriver in slot of threaded adapter disc
to prevent disc from rotating. Tighten forcing screw to relieve
tension from clutch pack.
6) Remove pinion gear thrust washers. Loosen forcing screw to
release pressure from clutch pack. Install appropriate turning bar in
hole on side of differential case. Perform STEP 2 shown in
illustration. See Fig. 2.
7) Using turning bar, rotate differential case until pinion
gears can be removed. Remove pinion gears. Remove turning bar, forcing
screw, step plate, and threaded adapter disc from differential case.
8) Remove upper side gear and clutch pack. See Fig. 1. Remove
differential case from axle shaft. Remove remaining side gear and
clutch pack from differential case.
CAUTION: Mark clutch pack location for reassembly reference. Note
position of clutch pack components before removing clutch
pack retainers. Clutch packs must be assembled in correct
order and installed in original location.
9) Remove clutch pack retainers from clutch pack. Keeping
clutch pack components in correct order, disassemble clutch pack.

Cleaning & Inspection
1) Clean components with solvent and dry with compressed air.
Inspect plates in clutch pack for scoring, wear or damage.
2) Inspect remaining components for damage or wear. Replace
components if necessary.
Reassembly
1) Lubricate clutch pack components with gear lube.
Reassemble clutch packs. Ensure components are installed in correct
sequence and in original location. See Fig. 1. Install clutch pack
retainers on clutch packs.
2) Install clutch packs on respective side gears. Install
differential case on axle shaft. Install clutch pack and lower side
gear in differential case.
3) Install step plate on lower side gear. Install upper side
gear and clutch pack in differential case. Install threaded adapter
disc into upper side gear. Install forcing screw.
4) Tighten forcing screw to compress clutch packs. Install
pinion gears on side gears. Using turning bar, rotate differential
case until hole in differential case is aligned with pinion gears.
Remove turning bar.
5) Lubricate pinion gear thrust washers with gear lube.
Install pinion gear thrust washers. It may be necessary to tighten
forcing screw until pinion gear thrust washers can be installed.
6) Remove forcing screw, step plate and threaded adapter
disc. Using soft-face hammer, tap pinion shaft into differential case.
Install snap rings on pinion shaft (if equipped).
7) Install NEW roll pin. Stake differential case in 2 areas
to retain roll pin. Remove differential case from axle shaft. Install
ring gear on differential case. Install NEW ring gear bolts. DO NOT
reuse bolts. Tighten ring gear bolts evenly in alternating pattern to
specification. See TORQUE SPECIFICATIONS table.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS








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Applications Ft. Lbs. (N.m)\
Axle Housing Cover Bolt .............................. 30-35 (41-47)\
Ring Gear Bolt
Dakota ................................................... 70 (95)\
All Others ..................................... 120-140 (163-190)\









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Apply multipurpose lubricant (NLGI grade 2 EP) to "U" joints
and slip joint fittings.
INSPECTION
Abnormal vibration and noise can come from many driveline
sources. Drive shaft vibration/noise increases with vehicle speed
(MPH). A vibration that occurs within a specific speed is not caused
by drive shaft imbalance. Before overhauling driveline, check for
other causes/sources of possible vibration/noise.
TIRES & WHEELS
Check tire inflation and wheel balance. Check for foreign
objects in tread, damaged tread, mismatched tread patterns or
incorrect tire sizes. Check for bent wheels.
CENTER BEARING
Tighten drive shaft center bearing mounting bolts. If bearing
insulator is deteriorated or oil-soaked, or drive shaft can be moved
up/down in support, replace center bearing support assembly.
ENGINE & TRANSMISSION MOUNTS
Tighten mounting bolts. If rubber mounts are deteriorated or
broken, replace as needed.
DRIVE SHAFT(S)
Check drive shaft(s) for missing weights, broken welds, or
for dents affecting balance. Check for undercoating, mud, snow/ice on
drive shaft(s). Clean shafts thoroughly and test drive.
"U" JOINTS
Check for foreign material lodged in joints and flange/yokes.
Check for loose "U" joint-to-flange mounting bolts. Check for worn "U"
joint needle bearings. Check for Reddish-Brown rust-dust around "U"
joint caps. Replace "U" joints if necessary.
ADJUSTMENTS
CHECKING DRIVE SHAFT PHASING
One-Piece Drive Shafts
1) Ensure "U" joint flanges on either end of drive shaft are
in same plane. See Fig. 2. Drive shafts with slip joints between yokes
often have arrows to aid in alignment. If yokes are not in same plane,
disassemble slip joint from drive shaft splines. Install slip joint
back onto drive shaft splines, aligning "U" joint yokes. Test drive.
2) Single tube type drive shaft has slip joint on outside of
"U" joint yoke (at transmission end). If one-piece tube type drive
shaft yokes are out of alignment, the drive shaft is torque-twisted.
Drive shaft must be replaced.

Fig. 7: Checking Vertical Alignment Of 2-Piece Drive Shaft
Courtesy of Chrysler Corp.
ADJUSTING VERTICAL ANGLE
If front angle minus rear angle is greater than one degree
positive (+1 degree), rear angle is too small and must be increased.
If front angle minus rear angle is greater than one degree negative (-
1 degree), rear angle is too large and must be decreased.
1) Raise and support rear of vehicle. Position a jack under
differential housing. Remove rear wheel assemblies. Loosen rear spring
"U" bolt nuts. Insert tapered shim between spring and axle spring pad.
If increasing angle, insert shim with taper facing front of vehicle.
If decreasing angle, insert shim with taper facing rear of vehicle.
NOTE: If encountering difficulty in making drive shaft vertical
adjustments on one-piece drive shafts, drive shaft may be out
of horizontal alignment. See CHECKING HORIZONTAL ALIGNMENT.
NOTE: On 2-piece drive shafts, center angle is adjusted by use of
shims between center support mounting bracket and frame
crossmember. Center angle may need adjusting if rear angle is
changed.
2) Tighten spring "U" bolt nuts to specification. See TORQUE
SPECIFICATIONS table. Recheck drive shaft angle measurements. See
CHECKING VERTICAL ANGLE.
CHECKING HORIZONTAL ALIGNMENT
1) Drive shaft horizontal alignment should be checked if
frame damage is suspected or when major components have been replaced.
See Fig. 8 .
2) Clamp a long straightedge (12" longer than width of rear
wheel track) at 90 degrees to frame side rails. See Fig. 9. Use large
framing squares to align straightedge with side rails.

link yoke enough to grasp bearing cap with vise jaws. Remove grease
fittings that interfere with removal.
4) Grasp protruding bearing in vise jaws. Tap link yoke with
mallet and drift to dislodge bearing cap from yoke.
5) Flip assembly and repeat steps 3 and 4 to remove opposite
bearing cap. Remove cross centering kit assembly and spring.
6) Press remaining bearing caps out other end of link yoke to
complete disassembly.
Reassembly & Installation
1) Clean dirt and rust from all contact areas. Apply
multipurpose lubricant (NLGI grade 2 EP) to yoke bores and into needle\
bearings of each bearing cap. Lube center socket yoke and needle
bearings. See Fig. 12.
2) Position spider in drive shaft yoke bore. Reassemble
components in reverse order of disassembly, ensuring reference marks
align. Install drive shaft in vehicle, and tighten flange bolts to
specification. See TORQUE SPECIFICATIONS table.
Installation
1) Before installing drive shaft, clean mating flange, and
inspect machined surface for scratches, nicks and burrs. Support drive
shaft during installation to prevent bending shaft at sharp angle to
CV joint and causing damage to "U" joints.
2) Aligning reference marks, install CV joint flange to
transfer case flange first, then install shaft to pinion flange.
Attach 2 clamps to pinion flange, and tighten attaching bolts to
specification. Install and tighten 4 bolts to CV joint at transfer
case flange.
TORQUE SPECIFICATIONS
TORQUE SPECIFICATIONS








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Application Ft. Lbs. (N.m)\
Center Bearing Support Bracket-To-Upper Bracket Bolts ...... 50 (68)\
Center Bearing Upper Bracket-To-Frame Bolts ................ 50 (68)\
Spring "U" Bolt Nuts
Dakota
2WD ..................................................... 65 (88)\
4WD ................................................... 110 (149)\
Ram Pickup ............................................. 110 (149)\
Ram Van/Wagon
B150 & B250 ............................................. 45 (61)\
B350 .................................................. 110 (149)\
Transfer Case Flange-To-CV Joint Flange Bolts
Dakota ................................................... 20 (27)\
Ram Pickup ............................................... 65 (88)\
"U" Joint Clamp-To-Pinion Flange Bolts
1/4" ..................................................... 14 (19)\
5/16" .................................................... 25 (34)\
Wheel Lug Nuts
Dakota .......................................... 85-115 (115-156)\
Ram Pickup
5-Lug .................................................. 95 (129)\
8-Lug (Single Wheel) .................................. 135 (183\
)
8-Lug (Dual Wheel) .................................... 145 (196\
)
Ram Van/Wagon
5-Lug .......................................... 80-110 (108-149)\
8-Lug ......................................... 120-150 (163-203)\









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FLANGES
FLEX PLATES
FLUID LEVEL INDICATORS
FLUIDS AND LUBRICANTS
FLYWHEELS
FORCE MOTORS
GUIDES
HALF SHAFTS
HOSES, LINES AND TUBES
HOUSINGS (BELL, CASE, TAIL (EXTENSION) AND AUXILIARY)
INTERMEDIATE SHAFT SUPPORT BEARINGS
KEY INTERLOCK SYSTEMS
LIMITED SLIPS
LINES
LINKAGES (EXTERNAL)
LOCKING HUB ASSEMBLIES
LOCKING HUB CONTROL KNOBS
LUBRICANTS
METAL-CLAD SEALS
METALASTIC JOINTS
MODULATOR PINS
MODULATORS
MOUNTS (ENGINE, TRANSAXLE AND TRANSMISSION)
ODOMETER DRIVES (MECHANICAL)
ODOMETER HEADS (MECHANICAL)
OIL PANS
PANS
PILOT HOLES
PRESSURE PLATES
PRESSURE SWITCHES
RACES
RUBBER JOINTS (METALASTIC)
SCREENS
SEALS
SEALS (METAL-CLAD)
SELECTOR INTERLOCK SYSTEMS
SERVOS
SHIFT INTERLOCK SYSTEMS (SELECTOR AND KEY INTERLOCK SYSTEMS)
SENSORS
SIDE COVERS
SLIP YOKES
SOLENOIDS
SPEED SENSORS (ELECTRONIC WHEEL AND VEHICLE)
SPEEDOMETER-DRIVEN GEAR HOUSINGS
SPEEDOMETER/ODOMETER DRIVES (MECHANICAL)
SPEEDOMETER/ODOMETER HEADS (MECHANICAL)
SPEEDOMETERS AND ODOMETERS (ELECTRONIC)
SWITCHES
TONE WHEELS
TOOTHED RINGS (TONE WHEELS)
TORQUE CONVERTERS
TRANSAXLE MOUNTS
TRANSDUCERS (TRANSMISSION)
TRANSMISSION COOLERS
TRANSMISSION MOUNTS
TRANSMISSION PANS
TRANSMISSION RANGE INDICATORS (PRNDL)
TUBES
UNIVERSAL JOINTS (CARDON OR CROSS TYPE)
VACUUM CONTROLS
VACUUM HOSES
VACUUM MOTORS
VACUUM-OPERATED SWITCHES