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21-138
TRANSFER CASE
•
NP241 T R A N S F E R C A S E
INDEX
Page
General Information
138
Recommended Lubricant
138
GENERAL INFORMATION
The NP241 is a p a r t - t i m e transfer case w i t h a low-
range gear system. I t has three operating ranges
plus a N e u t r a l position. T h e l o w range system pro-
vides a gear reduction r a t i o for increased low speed
torque capability.
The NP241 has three operating ranges w h i c h are:
Two-wheel drive h i g h , four-wheel drive h i g h and four
wheel-drive
l o w . T h e four-wheel
drive
operating
ranges are undifferentiated.
A f r o n t axle disconnect system is used to achieve
two-wheel drive mode. T h e axle disconnect v a c u u m
motor i s actuated by a v a c u u m switch on the transfer
case. The switch is operated b y t h e transfer case
range rod.
Two-wheel drive range is used for on road, h i g h -
way operation. T h e four-wheel drive ranges are for
off road operation or w h e n the vehicle is d r i v e n o n
paved road surfaces covered b y snow, ice or s i m i l a r
low t r a c t i o n elements.
Fig. 1 NP 241 Transfer Case
Page
Service Diagnosis
.
138
Transfer Case Identification . . . . . . . . . . . . . . . . .
138
TRANSFER CASE IDENTIFICATION
A c i r c u l a r identification t a g (Fig. 1) is attached to
the rear case o f each Model 241 transfer case. T h e
i d e n t i f i c a t i o n t a g provides t h e transfer case model
number, assembly number, serial number, a n d l o w
range r a t i o .
The transfer case serial number also represents the
date o f b u i l d . For example, a serial n u m b e r o f 9-9-89
w o u l d represent September 9, 1989.
Transfer case operating ranges are selected w i t h a
floor-mounted shift lever. The shift lever is connected
to t h e transfer case range lever b y a n adjustable
linkage r o d (Fig. 2). A s t r a i g h t l i n e shift p a t t e r n is
used. Range positions are m a r k e d on t h e gearshift le-
ver knob.
A synchronizer assembly i n t h e transfer case a l -
lows t h e u n i t to be shifted between t h e t w o a n d four-
wheel h i g h ranges w h i l e the vehicle is i n m o t i o n .
RECOMMENDED LUBRICANT
Recommended l u b r i c a n t for t h e N P 2 4 1 is Mopar
A T F Plus, type 7176, or Dexron II™ automatic trans-
mission f l u i d . Use t h i s f l u i d for t o p p i n g off t h e f l u i d
level, or r e f i l l i n g after f l u i d change or service.
Do not use a n t i f r i c t i o n additives or s i m i l a r m a t e r i -
als i n t h e NP241
transfer case. Use t h e recom-
mended f l u i d only.
N P 2 4 1 transfer case l u b r i c a n t should be changed
at t h e i n t e r v a l s specified i n the Maintenance Sched-
ule or after service repairs.
SERVICE DIAGNOSIS
Before a t t e m p t i n g t o repair a suspected
transfer
case m a l f u n c t i o n , check a l l other d r i v e l i n e
compo-
nents beforehand. The actual cause o f a problem may
be related t o such items as: front hubs, axles, propel-
ler shafts, wheels and tires, transmission, or clutch
instead. I f a l l other driveline components are i n good
condition and operating properly, refer to the Service
Diagnosis chart for f u r t h e r i n f o r m a t i o n .
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