The Transfer case you have is the NV244 Gen II, Here is a snip it from the 04 Service Manual since I dont know what year truck (03 to 06 is there .. just scroll down a little and you will see them) you have which by the way you can download off of hemitruckclub.com (on the left side in pdf format)
There is no LSD in the front and not sure if this is what you are asking for but here goes.
TRANSFER CASE - NV244 GENII
DESCRIPTION
The NV244 GENII is an electronically controlled
full and part-time transfer case with no two wheel
drive operation.
A differential in the transfer case is used to control
torque transfer to the front and rear axles. A low
range gear reduction system provides increased low
speed torque capability for off road operation. The
low range provides a 2.72:1 reduction ratio.
The geartrain is mounted in two aluminum case
halves attached with bolts. The mainshaft front and
rear bearings are mounted in aluminum retainer
housings bolted to the case halves.
OPERATING RANGES
NV244 GENII operating ranges are:
² AWD(All-Wheel Drive)
² 4HI (Part-time)
² 4LO
² NEUTRAL
The AWD mode can be used at any time and on
any road surface.
The 4HI (Part-time) and 4LO ranges are for off
road use only. The only time these ranges can be
used is when the road surface is covered with snow,
ice, or other loose slippery material.
SHIFT MECHANISM
Operating ranges are selected with a dash
mounted shift selector switch. The shift selector
switch provides a input to the Transfer Case Control
Module (TCCM) to indicate the driver’s desire to
change operating ranges. The TCCM uses this input,
along with the input from the transfer case mounted
mode sensor and information from the vehicle’s bus,
to determine if a shift is permitted. If the TCCM
decides the shift is permitted, the TCCM controls the
shift motor, mounted to the exterior of the transfer
case, to perform the shift.
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