Page 2521 of 5267
3. Reconnect the quick connect fitting (1) to the return
and supply hoses to the power steering fluid cooler.
4. Install the hose retaining bracket (3).
5. Install the air deflector shield (4).
6. Install the lower front air deflector.
7. Refill the power steering fluid (Refer to 19 -
STEERING/PUMP - STANDARD PROCEDURE).
Page 2522 of 5267

TRANSMISSION AND TRANSFER CASE
TABLE OF CONTENTS
page page
MANUAL TRANSMISSION - G56 - SERVICE
INFORMATION...........................1
MANUAL TRANSMISSION - GETRAG 238 -
SERVICE INFORMATION..................70
MANUAL TRANSMISSION-T56 - SERVICE
INFORMATION.........................142
AUTOMATIC TRANSMISSION 42RLE -
ELECTRICAL DIAGNOSTICS..............203
AUTOMATIC TRANSMISSION 42RLE - SERVICE
INFORMATION.........................389
AUTOMATIC TRANSMISSION - 545RFE -
ELECTRICAL DIAGNOSTICS..............580
AUTOMATIC TRANSMISSION - 45RFE/545RFE -
SERVICE INFORMATION.................842
AUTOMATIC TRANSMISSION - 48RE - GAS -
ELECTRICAL DIAGNOSTICS..............987AUTOMATIC TRANSMISSION - 48RE - DIESEL -
ELECTRICAL DIAGNOSTICS.............1105
AUTOMATIC TRANSMISSION - 48RE - SERVICE
INFORMATION........................1266
TRANSFER CASE - ELECTRICAL
DIAGNOSTICS........................1499
TRANSFER CASE - NV241 GENII - SERVICE
INFORMATION........................1563
TRANSFER CASE - NV271 - SERVICE
INFORMATION........................1605
TRANSFER CASE - NV243 - SERVICE
INFORMATION........................1656
TRANSFER CASE - NV244 GENII - SERVICE
INFORMATION........................1700
TRANSFER CASE - NV273 - SERVICE
INFORMATION........................1743
page page
MANUAL TRANSMISSION - G56 - SERVICE
INFORMATION
DIAGNOSIS AND TESTING
MANUAL TRANSMISSION - G56 ............... 2
STANDARD PROCEDURE
DRAIN AND FILL ............................. 3
REMOVAL ..................................... 4
DISASSEMBLY ................................ 8
CLEANING ................................... 28INSPECTION ................................. 28
ASSEMBLY ................................... 29
INSTALLATION ............................... 58
ADJUSTMENTS
MAINSHAFT/COUNTERSHAFT BEARING
PRELOAD.................................. 62
SPECIFICATIONS
MANUAL TRANSMISSION-G56 ............... 65
SPECIAL TOOLS .............................. 67
Page 2523 of 5267

MANUAL TRANSMISSION - G56 - SERVICE INFORMATION
DIAGNOSIS AND TESTING
MANUAL TRANSMISSION - G56
LOW LUBRICANT LEVEL
A low transmission lubricant level is generally the result of a leak, inadequate lubricant fill or incorrect lubricant level
check.
Rear transmission leakswill be from the oil seals or component mating surfaces.
Front transmission leakswill be from the front input shaft retainer seal. Lubricant may drip from theclutchhousing
after extended operation. If leak is severe, it may contaminate the clutchdisc.
Lubricant level checkcan only be made when the vehicle is level and allowing the lubricant to settle for a minute
before checking. This will ensure an accurate check and avoid an under or overfill condition.
HARD SHIFTING
Hard shifting is usually caused by low lubricant level, improper or contaminated lubricants. This will cause noise,
excessive wear, internal bind, and hard shifting. Substantial lubricantleaks can result in gear, shift rail, synchro, and
bearing damage. The first indications of component damage is usually hardshifting and noise.
Shift component damage, clutch adjustment, worn pressure plate or disc are also causes of increased shift effort. If
clutch problem is advanced, gear clash during shifts can result. Worn or damaged synchronizer rings can cause
gear clash when shifting into any forward gear. In some new or rebuilt transmissions, new synchro rings may tend
to stick slightly causing hard or noisy shifts. In most cases, this condition will decline as the rings wear-in.
TRANSMISSION NOISE
Most manual transmissions make some noise during normal operation. Rotating gears generate a mild whine that is
audible, but generally only at extreme speeds.
Severe, highly audible transmission noise is generally the initial indicator of a lubricant problem. Insufficient,
improper or contaminated lubricant will promote rapid wear of gears, synchronizer rings, shift rails, forks and bear-
ings. The overheating caused by a lubricant problem, can also lead to gear and bearing damage.
Page 2524 of 5267
STANDARD PROCEDURE
DRAIN AND FILL
1. Raise and support vehicle.
2. Remove drain plug (1) on transmission (2) and
drain fluid.
3. Install drain plug and tighten to 57 Nꞏm (42 ft. lbs.).
4. Remove fill plug (1) on right side of the transmis-
sion (2).
5. Fill transmission even with the bottom of the fill
hole.
6. Install fill plug and tighten to 57 Nꞏm (42 ft. lbs.).
Page 2525 of 5267
REMOVAL
1. With vehicle in neutral, position vehicle on hoist.
2. Disconnect battery negative cable.
3. Remove shift boot bezel screws and slide boot
upward on shift lever extension.
4. Remove shift lever extension from the shift tower
and lever assembly.
5. Remove 4WD shift boot if equipped.
6. Remove skid plate, if equipped.
7. Remove drain plug (1) from transmission (2) and
drain fluid.
8. Mark transmission flange (1) and propeller shaft (2)
for installation reference before removing propeller
shaft. If 4x4 equipped mark transfer case and front
propeller shaft before removing shaft.
Page 2526 of 5267
9. Disconnect harness from clips on transmission
housing.
10. Remove transfer case linkage 4x4 equipped.
11. Remove transfer case mounting nuts and remove
transfer case 4x4 equipped.
12. Remove slave cylinder (1) mounting nuts (2) and
remove cylinder.
13. Remove starter motor (1) on 5.7L engine.
Page 2527 of 5267
14. Remove structural dust cover (1) clutch housing
bolts (2) and dust shield bolts (3) on 5.7L engine.
CAUTION: On 5.7L engine do not remove struc-
tural dust cover from engine block. If cover is
removed clutch housing and structural dust cover
must be aligned with the engine.
15. Remove exhaust bracket (1) bolts and remove
bracket on diesel engine.
Page 2528 of 5267
16. Support engine with adjustable jack stand and
wood block.
17. Support and secure transmission (1) to a trans-
mission jack (2) with safety chains.
18. Remove transmission mount bolts (1).
19. Remove rear crossmember bolts (2) and remove
crossmember with transmission mount.
20. Remove exhaust Y-pipe on 5.7L engine.
21. Remove bolts attaching transmission to the
engine.
22. Move transmission rearward until input shaft is
clear of clutch disc and pressure plate. Then
lower jack and remove transmission from under
vehicle.