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TRANSMISSION—TRANSFER CASE
21 - 1
TRANSMISSION-TRANSFER C A S E
C O N T E N T S
Page
A833 MANUAL TRANSMISSION
1
A998/S9I/727 AUTOMATIC TRANSMISSIONS . 43
A500/518 AUTOMATIC TRANSMISSION
111
NP2500 MANUAL TRANSMISSION
16
Page
General Information
1
Service Diagnosis
2
Service In Vehicle
3
GENERAL INFORMATION
TRANSMISSION
COMPONENTS
The A833 is a f u l l y synchronized, four-speed, m a n -
u a l transmission (Fig. 1 and 2). I t is used p r i m a r i l y
for s i x cylinder engine applications. F o u r t h gear is
an overdrive range w i t h a ratio of .71:1.
The transmission i n p u t shaft is supported b y a b a l l
b e a r i n g i n the front o f the transmission case and a n
by a n oilite pilot bushing i n t h e crankshaft p i l o t
b u s h i n g bore. The mainshaft front end is supported
by r o l l e r bearings i n the end of the m a i n drive p i n i o n
and b y a b a l l bearing i n the front of the extension
housing. The output end of the mainshaft is splined
to the s l i d i n g universal j o i n t yoke. The j o i n t is sup-
ported b y a bushing i n the extension housing.
The countershaft gear is supported by a double row
of needle type roller bearings a t each end. Gear end
t h r u s t is controlled b y t h r u s t washers between t h e
ends o f the gear a n d t h e transmission case. T h e
a l i g n m e n t of the needle type roller bearings w i t h i n
the gear is m a i n t a i n e d b y a t u b u l a r spacer and four
t h r u s t washers.
The countershaft is n o t a press f i t i n t h e case
bores. T h e shaft has a .12 m m (.005 inch) diameter
clearance. A n expansion
p l u g is pressed into a
counter bore a t the front of the case t o prevent o i l
Page
NP435 MANUAL TRANSMISSION
36
NP205 TRANSFER CASE
130
NP241 TRANSFER CASE
138
Page
Service Out Of Vehicle . . . . . . . . . . . . . . . . . . . . . . 5
Specifications
149
Tightening Reference
154
leakage around the countershaft.
The reverse idler gear is supported on a bronze
bushing pressed into the gear.
A magnetic disc is attached to the bottom, rear of
the case. The magnet collects and prevents circula-
t i o n of chips i n the transmission o i l .
Gearshifting is m a n u a l l y operated
t h r o u g h shift
control rods attached to the transmission shift levers
(Fig. 2). A n y forward gear may be engaged w h i l e the
vehicle is i n motion t h r o u g h the use o f synchronizing
clutches.
The transmission synchronizers are serviced as as-
semblies.
Except
for t h e stop rings,
synchronizer
parts are not interchangeable.
The transmission may be used as a n aid to decel-
eration. Downshifting w i t h o u t double
c l u t c h i n g is
possible as a l l forward speeds are synchronized. Refer
to Specifications for downshift speed l i m i t s .
RECOMMENDED
LUBRICANTS
The p r i m a r y lubricant recommended for the over-
drive-4 is A T F PLUS, type 7176 automatic t r a n s m i s -
sion fluid. However, when heavy d u t y operation is
anticipated, SAE gear lubricants meeting A P I grade
G L 5 quality can also be used for quieter operation.
These lubricants include 75W-90, 80W-90,
85W-90
and 90W.
A833 MANUAL TRANSMISSION
INDEX
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