PARTIAL EMCC
Partial EMCC operation modulates the TCC Sole-
noid (duty cycle) to obtain partial torque converter
clutch application. Partial EMCC operation is main-
tained until Full EMCC is called for and actuated.
During Partial EMCC some slip does occur. Partial
EMCC will usually occur at low speeds, low load and
light throttle situations.
FULL EMCC
During Full EMCC operation, the TCM increases
the TCC Solenoid duty cycle to full ON after Partial
EMCC control brings the engine speed within the
desired slip range of transmission input speed rela-
tive to engine rpm.
GRADUAL-TO-NO EMCC
This operation is to soften the change from Full or
Partial EMCC to No EMCC. This is done at mid-
throttle by decreasing the TCC Solenoid duty cycle.
REMOVAL
(1) Remove transmission and torque converter
from vehicle.
(2) Place a suitable drain pan under the converter
housing end of the transmission.
CAUTION: Verify that transmission is secure on the
lifting device or work surface, the center of gravity
of the transmission will shift when the torque con-
verter is removed creating an unstable condition.
The torque converter is a heavy unit. Use caution
when separating the torque converter from the
transmission.
(3) Pull the torque converter forward until the cen-
ter hub clears the oil pump seal.
(4) Separate the torque converter from the trans-
mission.
INSTALLATION
Check converter hub and drive flats for sharp
edges, burrs, scratches, or nicks. Polish the hub and
flats with 320/400 grit paper or crocus cloth if neces-
sary. The hub must be smooth to avoid damaging the
pump seal at installation.
(1) Lubricate oil pump seal lip with transmission
fluid.
(2) Place torque converter in position on transmis-
sion.
CAUTION: Do not damage oil pump seal or con-
verter hub while inserting torque converter into the
front of the transmission.
(3) Align torque converter to oil pump seal open-
ing.
(4) Insert torque converter hub into oil pump.
(5) While pushing torque converter inward, rotate
converter until converter is fully seated in the oil
pump gears.
(6) Check converter seating with a scale and
straightedge (Fig. 179). Surface of converter lugs
should be at least 19 mm (3/4 in.) to rear of straight-
edge when converter is fully seated.
(7) If necessary, temporarily secure converter with
C-clamp attached to the converter housing.
(8) Install the transmission in the vehicle.
(9) Fill the transmission with the recommended
fluid.
TRANSFER CASE - NV247
REMOVAL
(1) Open the hood and disconnect the negative bat-
tery cable.
(2) Remove the (2) upper fan shroud retaining
bolts.
(3) Raise the vehicle on a hoist.
(4) Remove the (2) lower fan shroud retaining
bolts.
CAUTION: Mark the position of the driveshaft in
relation to its companion flange prior to disassem-
bly. Driveshaft must be reinstalled in the same posi-
tion it was in prior to disassembly.
(5) Remove the front driveshaft retaining bolts
(Fig. 180) and remove the driveshaft from the trans-
fer case companion flange. Support the driveshaft
with mechanics wire.
Fig. 179 Torque Converter Installation Depth
1 - TORQUE CONVERTER
2 - TRANSMISSION HOUSING
21a - 118
TRANSMISSION AND TRANSFER CASE
WG
TORQUE CONVERTER (Continued)