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Condition Possible Cause Correction
Lubricant leaking from output shaft
seal or vent.1) Transfer case overfilled. 1) Drain lubricant to the correct
level.
2) Vent closed or restricted. 2) Clear or replace vent as
necessary.
3) Output shaft seals damaged or
installed incorrectly.3) Replace seal as necessary.
Check to ensure that another
component, the propeller shaft slip
yoke for example, is not causing
damage to seal.
Abnormal tire wear. 1) Extended operation on hard, dry
surfaces in the 4H position.1) Operate vehicle in the 2H
position on hard, dry surfaces.
REMOVAL
1. Raise and support vehicle.
2. Remove skid plate, if equipped. (Refer to 13 - FRAMES & BUMPERS/FRAME/TRANSFER CASE SKID PLATE
- REMOVAL)
3. Position drain oil container under transfer case.
4. Remove transfer case drain plug and drain lubricant into container.
5. Disconnect vent hose and transfer case position sensor connector.
6. Disconnect shift rod from grommet in transfer case shift lever, or from floor shift arm whichever provides easy
access. Use channel lock style pliers to press rod out of lever grommet.
7. Support transmission with jack stand.
8. Mark front and rear propeller shafts for assembly reference.
9. Remove front and rear propeller shafts. (Refer to 3 - DIFFERENTIAL & DRIVELINE/PROPELLER SHAFT/PRO-
PELLER SHAFT - REMOVAL)
10. Support transfer case with suitable jack. Secure transfer case to jackwith safety chains.
11. Remove nuts attaching transfer case to transmission.
12. Move transfer case assembly rearward until free of transmission outputshaft.
13. Lower jack and move transfer case from under vehicle.
DISASSEMBLY
Position transfer case in a shallow drain pan. Remove drain plug and drain any remaining lubricant remaining in
case.
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8. Remove bottom tabbed thrust washer (2) from low
range planetary (1).
CLEANING
Clean the transfer case parts with a standard parts cleaning solvent. Remove all traces of sealer from the cases
and retainers with a scraper and 3M™ all purpose cleaner. Use compressed air to remove solvent residue from oil
feed passages in the case halves, retainers, gears, and shafts.
INSPECTION
MAINSHAFT/SPROCKET/HUB
Inspect the splines on the hub and shaft and the teeth on the sprocket. Minornicks and scratches can be smoothed
with an oilstone, however, replace any part that is damaged.
Check the contact surfaces in the sprocket bore and on the mainshaft. Minornicks and scratches can be smoothed
with 320-400 grit emery cloth but do not try to salvage the shaft if nicks or wear is severe.
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INPUT GEAR AND PLANETARY CARRIER
Check the teeth on the gear (6). Minor nicks can be dressed off with an oilstone but replace the gear if any teeth
are broken, cracked, or chipped. The bearing surface on the gear can be smoothed with 300-400 grit emery cloth
if necessary.
Examine the carrier body and pinion gears for wear or damage. Check the pinion gear thrust washers on the pinon
pins for damage. The carrier will have to be replaced as an assembly if the body, pinion pins, or pinion gears are
damaged.
Check the lock ring and both thrust washers for wear or cracks. Replace themif necessary. Also replace the lock
retaining ring if bent, distorted, or broken.
Input Gear And Carrier Components
1 - PLANETARY CARRIER 4 - CARRIER LOCK RING
2 - REAR THRUST WASHER 5 - CARRIER LOCK RETAINING RING
3 - FRONT THRUST WASHER 6 - INPUT GEAR
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FRONT CASE AND REAR CASE
Inspect the cases for wear and damage.
Check case condition. If leaks were a problem, look for gouges and severe scoring of case sealing surfaces. Also
make sure the front case mounting studs are in good condition.
Check the front case mounting studs and vent tube. The tube can be secured with Loctite™ 271 or 680 if loose.
Thestudthreadscanbecleanedupwithadieifnecessary.Alsocheckcondition of the fill/drain plug threads in the
rear case. The threads can be repaired with a thread chaser or tap if necessary. Or the threads can be repaired with
Helicoil™ stainless steel inserts if required.
OIL PUMP/OIL PICKUP
Examine the oil pump pickup parts. Replace the pump if any part appears to beworn or damaged. Do not disas-
semble the pump as individual parts are not available. The pump is only available as a complete assembly. The
pickup screen, hose, and tube are the only serviceable parts and are available separately.
ASSEMBLY
BEARINGS AND SEALS
1. Remove the input shaft bearing snap-ring from the
front case half with suitable snap-ring pliers.
2. Remove the input shaft bearing from the front case
half with Bearing Installer 6953 (3) and Universal
Handle C-4171 (2).
3. Install the input shaft bearing into the front case
half with Bearing Cup Installer 8151 (3) inverted on
Universal Handle C-4171 (2).
4. Install the input shaft bearing snap-ring into the
front case half with suitable snap-ring pliers.
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4. Remove input gear (1).
5. Remove rear tabbed thrust washer (2) from low
range gear (1).
CLEANING
Clean the transfer case parts with a standard parts cleaning solvent. Remove all traces of sealer from the cases
and retainers with a scraper and 3M™ all purpose cleaner. Use compressed air to remove solvent residue from oil
feed passages in the case halves, retainers, gears, and shafts.
INSPECTION
MAINSHAFT/SPROCKET/HUB INSPECTION
Inspect the splines on the hub and shaft and the teeth on the sprocket. Minornicks and scratches can be smoothed
with an oilstone. However, replace any part that is damaged.
Check the contact surfaces in the sprocket bore and on the mainshaft. Minornicks and scratches can be smoothed
with 320-400 grit emery cloth but do not try to salvage the shaft if nicks or wear is severe.
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INPUT GEAR AND PLANETARY CARRIER
Check the teeth on the input gear (6). Minor nicks can be dressed off with an oilstone but replace the gear if any
teeth are broken, cracked, or chipped. The bearing surface on the gear can besmoothedwith300-400gritemery
cloth if necessary.
Examine the planetary carrier body (1) and pinion gears for wear or damage.The carrier will have to be replaced
as an assembly if the body, pinion pins, or pinion gears are damaged.
Check the carrier lock ring (4) and both thrust washers (2, 3) for wear or cracks. Replace them if necessary. Also
replace the lock retaining ring if bent, distorted, or broken.
SHIFT FORKS/HUBS/SLEEVES
Check condition of the shift forks and mode fork shift
rail (2). Minor nicks on the shift rail can be smoothed
with 320-400 grit emery cloth.
Input Gear and Carrier Components
1 - PLANETARY CARRIER 4 - CARRIER LOCK RING
2 - REAR THRUST WASHER 5 - CARRIER LOCK RETAINING RING
3 - FRONT THRUST WASHER 6 - INPUT GEAR
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Inspect the shift fork wear pads (3, 4). The mode (2)
and range (1) fork pads are serviceable and can be
replaced if necessary.
Check both of the sleeves for wear or damage, espe-
cially on the interior teeth. Replace the sleeves if wear
or damage is evident.
REAR EXTENSION HOUSING
Inspect the extension housing seal and bushing. Replace both components if either show any sign of wear or dam-
age.
FRONT OUTPUT SHAFT AND DRIVE CHAIN
Inspect the shaft threads, sprocket teeth, and bearing surfaces. Minor nicksontheteethcanbesmoothedwithan
oilstone. Use 320-400 grit emery to smooth minor scratches on the shaft bearing surfaces. Rough threads on the
shaft can be chased if necessary. Replace the shaft if the threads are damaged, bearing surfaces are scored, or if
any sprocket teeth are cracked or broken.
Examine the drive chain and shaft bearings. Replace the chain and both sprockets if the chain is stretched, dis-
torted, or if any of the links bind. Replace the bearings if rough, or noisy.
LOW RANGE ANNULUS GEAR
Inspect annulus gear (2) condition carefully. The gear
is only serviced as part of the front case (1). If the
gear is damaged, it will be necessary to replace the
gear and front case as an assembly. Do not attempt to
remove the gear.
FRONT AND REAR CASES
Inspect the cases for wear and damage.
Check case condition. If leaks were a problem, look for gouges and severe scoring of case sealing surfaces. Also
make sure the front case mounting studs are in good condition.
Check the front case mounting studs and vent tube. The tube can be secured with Loctite™ 271 or 680 if loose.
Thestudthreadscanbecleanedupwithadieifnecessary.Alsocheckcondition of the fill/drain plug threads in the
rear case. The threads can be repaired with a thread chaser or tap if necessary. Or the threads can be repaired with
Helicoil
stainless steel inserts if required.
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4. Remove input gear (1).
5. Remove rear tabbed thrust washer (2) from low
range gear (1).
CLEANING
Clean the transfer case parts with a standard parts cleaning solvent. Remove all traces of sealer from the cases
and retainers with a scraper and 3M™ all purpose cleaner. Use compressed air to remove solvent residue from oil
feed passages in the case halves, retainers, gears, and shafts.
INSPECTION
MAINSHAFT/SPROCKET/HUB INSPECTION
Inspect the splines on the hub and shaft and the teeth on the sprocket. Minornicks and scratches can be smoothed
with an oilstone. However, replace any part that is damaged.
Check the contact surfaces in the sprocket bore and on the mainshaft. Minornicks and scratches can be smoothed
with 320-400 grit emery cloth but do not try to salvage the shaft if nicks or wear is severe.