bearing preload is checked before disassembly, as previous
pinion bearing preload will be used during reassembly.
Removal
1) Raise and support vehicle. Scribe reference mark on drive
shaft-to-pinion flange on differential for reassembly reference.
Remove bolts and "U" joint straps at pinion flange on differential.
Disconnect drive shaft from differential.
2) Remove rear wheels and brake drums to prevent any drag
that may affect pinion bearing preload reading. Using INCH-lb. torque
wrench, measure amount of force required to rotate pinion. This is
pinion bearing preload. Record pinion bearing preload for reassembly
reference.
3) Using Holder (6719), hold pinion flange. Remove pinion nu\
t
and washer. Scribe reference mark on pinion flange-to-pinion for
reassembly reference. Using appropriate puller, remove pinion flange
from pinion. Remove oil seal from axle housing.
Installation
1) Ensure oil seal surface in axle housing is clean. Coat lip
of oil seal with gear lube. Install oil seal using appropriate seal
installer. Drive oil seal into axle housing until oil seal installer
contacts axle housing.
2) Install pinion flange on pinion with reference mark
aligned. Using appropriate pinion flange installer, install pinion
flange on pinion.
CAUTION: Washer must be installed on pinion with convex side of washer
facing outward (away from pinion).
3) Install washer on pinion with convex side of washer facing
outward (away from pinion). Install NEW pinion nut. Tighten pinion nut\
to 210 ft. lbs. (285 N.m). Rotate pinion several times to seat pinion
bearings.
CAUTION: DO NOT overtighten or loosen then retighten pinion nut when
adjusting pinion bearing preload. If pinion nut is over
tightened, collapsible spacer on pinion must be replaced. See
OVERHAUL.
4) Using INCH-lb. torque wrench, measure pinion bearing
preload. Tighten pinion nut in small increments until original pinion
bearing preload is obtained.
5) To install remaining components, reverse removal procedure
using NEW "U" joint straps and bolts. Ensure all reference marks are
aligned. Tighten bolts to specification. See TORQUE SPECIFICATIONS.
Check lubricant level and add if necessary.
AXLE HOUSING ASSEMBLY
NOTE: It is not necessary to remove axle housing assembly, unless
axle housing is damaged. Differential carrier and components
can be serviced by removing differential assembly from axle
housing.
Removal
1) Raise and support vehicle. Block brake pedal in upward
position so brake pedal cannot be depressed, as brakelines must be
disconnected.
2) Remove rear wheels. DO NOT remove brake drums. Disconnect
brakelines at wheel cylinders. Cap brakelines to prevent fluid loss.
Disconnect axle housing vent hose.
3) Remove brake tee fitting bolt, and disengage brakelines
respective differential bearings for reassembly reference.
6) Remove bolt and adjuster lock (if not previously removed)\
.
Loosen, but DO NOT remove, bearing cap bolts. Using Adjuster Rotator
(C-4164), unscrew adjusters from bearing caps. See Figs. 1 and 2.
Remove bolts, bearing caps, adjusters, and differential assembly.
7) Using Holder (C-3281), hold pinion flange. Remove pinion
nut and washer. Scribe reference mark on pinion flange-to-pinion for
reassembly reference. Using appropriate puller, remove pinion flange
from pinion. Remove oil seal for pinion from axle housing. Using soft
drift punch and hammer, drive pinion from axle housing.
NOTE: Front pinion bearing, bearing race, and collapsible spacer
must be replaced after removing pinion from axle housing.
8) Drive pinion bearing races from axle housing. Remove
pinion bearing from pinion. Remove shim(s) located behind pinion
bearing on pinion. Record shim thickness for reassembly reference.
CAUTION: DO NOT remove ring gear from differential carrier unless
components must be replaced or differential carrier flange
runout must be checked.
9) If removing ring gear (and exciter ring on RWAL brake
equipped models), mount differential carrier in soft-jaw vise. Remove
and discard left-hand thread ring gear bolts. Using soft-face hammer,
drive ring gear from differential carrier. Tap exciter ring from
differential carrier, if equipped.
10) If disassembling differential carrier, rotate side gears
and align pinion gears with opening in differential carrier. Remove
pinion gears and pinion gear thrust washers. See Fig. 1. Remove side
gears and side gear thrust washers.
11) If checking differential carrier flange runout, install
differential carrier, bearing races, bearing caps and adjusters in
axle housing. Ensure components are installed in original location.
Thread adjusters into bearing caps.
12) Tighten bearing cap bolts enough to just hold bearing
caps against axle housing. Using Adjuster Rotator (C-4164), tighten
adjuster so no side play exists. Side play can be checked by prying
differential carrier to one side.
13) Install dial indicator on axle housing with stem resting
against differential carrier flange. See Fig. 2. Rotate differential
carrier and note differential carrier flange runout. Replace
differential carrier if runout exceeds .003" (.08 mm).
14) Remove dial indicator, bearing caps, adjusters, bearing
races and differential carrier. Remove differential bearings from
differential carrier (if necessary).
15) Use appropriate puller and adapter (bearing splitter) to\
remove bearing from carrier. On models with Rear Wheel Anti-Lock
(RWAL) brakes, if removing exciter ring, use hammer and soft drift to
tap exciter ring from differential carrier.
hole in differential carrier.
3) If ring gear and exciter ring (models with Rear Wheel
Anti-Lock brakes) were removed, slowly and evenly tap exciter ring
onto differential carrier. Ensure contact surface of ring gear and
differential carrier flange are clean and free of all nicks and burrs.
Remove any sharp areas from chamfer on inside diameter of ring gear.
4) Place ring gear into position on differential carrier.
Start 2 NEW ring gear bolts to align ring gear. Using brass drift and
hammer, alternately and evenly tap ring gear into position. Install
NEW ring gear bolts and tighten to specification. See TORQUE
SPECIFICATIONS.
NOTE: Use components from Pinion Gauge Set (C-3715-B) for 8 1/4"
ring gear, or (C-758-D6) for 9 1/4" ring gear) to complete
assembly. For proper component part number, see PINION GAUGE
SET COMPONENT APPLICATION table.
5) Install differential bearings on differential carrier (if
removed). Use appropriate bearing installer when installing
differential bearings. Go to PINION DEPTH.
PINION GAUGE SET COMPONENT APPLICATION
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Component 8 1/4" 9 1/4"
Ring Gear Ring Gear
Part No. Part No.
Arbor ........................... SP-6029 ................ SP-6018
Gauge Block ..................... SP-5383 ................ SP-6020
Nut ............................. SP-3193 ................. SP-533
Shaft ........................... SP-5385 ................. SP-526
Sleeve "A" ...................... SP-5382 ................ SP-1730
Sleeve "B" ..................... SP-3194-B .............. SP-535-A
Spacer "A" ...................... SP-6030 ................ SP-6017
Spacer "B" ...................... SP-6022 ................ SP-6022
Washer ........................... SP-534 ................. SP-534
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Pinion Depth
1) Using appropriate driver, install bearing races for pinion
bearings in axle housing (if removed). Assemble spacer "A" over shaft
followed by rear (pinion gear side) pinion bearing. See Fig. 3.
Install assembly into axle housing assembly.
2) Install sleeve "A" and front (pinion flange side) pinion
bearing on shaft. Install spacer "B", sleeve "B", washer and nut on
shaft. See Fig. 3. Using Holder (C-3281), hold sleeve "B" from
rotating and gradually tighten nut to seat pinion bearings.
NOTE: When tightening nut to seat pinion bearings, remove holder
and allow sleeve "B" to rotate several times during
tightening procedure to prevent damage to pinion bearings and
bearing cups.
3) Loosen nut. Lubricate pinion bearings with gear lube.
Retighten nut to 15-25 INCH lbs. (2-3 N.m). Rotate pinion several
times to fully seat pinion bearings.
4) Install gauge block and bolt on end of shaft. Using Allen
wrench, tighten bolt. Install arbor in axle housing. See Fig. 3.
Ensure arbor is centered in axle housing.
5) Place a piece of .002" (.05 mm) thick shim stock between
arbor and axle housing on each end of arbor. Install bearing caps over
arbor. Install and tighten bearing cap bolts to 120 INCH lbs. (14 N.
m). Using feeler gauge, check clearance between arbor and gauge block.
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.