COUNTERSHAFT
1. Remove countershaft bearing cup and shims from
the rear housing.
2. Position Fixture 9592 (1) on rear housing over the
countershaft bearing cup bore.
3. Loosen the knob (2) on the fixture and lower the
shaft onto the countershaft bearing cup (3) bore
shoulder. Then tighten the knob to hold the shaft.
4. Remove the fixture from the front housing.
5. Place countershaft bearing cup on countershaft
bearing.
6. Position Fixture 9592 (1) on rear housing over the
countershaft bearing (2).
7. Loosen the knob (3) on the fixture (1). This will
allow the rod plunger to drop down on the bearing
cup.
8. Measure the gap (1) between the fixture shaft (2)
and the fixture plunger (3). Repeat measurement
on the opposite side of the countershaft cup and
bearing. The average of the two measurements,
will be the size of the countershaft select shim.
9. Install select shim in front housing countershaft
bearing cup bore and install bearing cup.
SPECIFICATIONS
MANUAL TRANSMISSION-G56
TORQUE SPECIFICATIONS
DESCRIPTION Nꞏm Ft. Lbs. In. Lbs.
Fill Plug 57 42 -
Drain Plug 57 42 -
Front to Rear Housing
Bolts58 43 -
Input Shaft Retainer Bolts 23 17 -
Shift Tower bolts 23 17 -
5-6 Shift Fork Bolts 58 43 -
Shift Rail Support bolts 58 43 -
Reverse Idler Gear Shaft
Bolt58 43 -
P.T.O. Cover Bolts 58 43 -
Clutch Release Pivot Ball 22 16 -
page page
MANUAL TRANSMISSION - GETRAG 238 -
SERVICE INFORMATION
DIAGNOSIS AND TESTING
MANUAL TRANSMISSION - GETRAG 238 . . . . . 71
STANDARD PROCEDURE
DRAIN AND FILL ............................ 71
REMOVAL .................................... 72
DISASSEMBLY ............................... 74CLEANING .................................. 100
INSPECTION . . .............................. 100
ASSEMBLY .................................. 103
INSTALLATION .............................. 135
SPECIFICATIONS
MANUAL TRANSMISSION - GETRAG 238 . . . . 136
SPECIAL TOOLS ............................ 138
MANUAL TRANSMISSION - GETRAG 238 - SERVICE INFORMATION
DIAGNOSIS AND TESTING
MANUAL TRANSMISSION - GETRAG 238
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 transfer case front seal on 4x4.
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 can be 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, can 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 asthe 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.
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 50 Nꞏm (37 ft. lbs.).