Page 1617 of 2585
(3) Index rear cover to the case for later reassem-
bly (Fig. 51).
(4) Pull rear cover out of the P.T.U. case (Fig. 52).
(5) Remove rear cover O-Ring (Fig. 53).
INSTALLATION
(1) To install, reverse removal procedure.
Fig. 51 Mark Rear Cover
1 - REAR COVER
2 - OUTPUT SHAFT
3 - PAINT MARK
Fig. 52 Rear Cover Removal
1 - POWER TRANSFER UNIT ASSEMBLY
2 - REAR COVER
3 - O-RING
Fig. 53 O-Ring Removal
1 - REAR COVER
2 - PINION GEAR
3 - O-RING
21 - 20 POWER TRANSFER UNITRS
REAR COVER O-RING (Continued)
Page 1618 of 2585

T850 MANUAL TRANSAXLE
TABLE OF CONTENTS
page page
T850 MANUAL TRANSAXLE
DESCRIPTION.........................21
OPERATION...........................24
DIAGNOSIS AND TESTING - COMMON
PROBLEM CAUSES....................30
REMOVAL.............................31
DISASSEMBLY.........................35
ASSEMBLY............................42
INSTALLATION.........................51
SPECIFICATIONS - T850 MANUAL
TRANSAXLE.........................56
SPECIAL TOOLS - T850 TRANSAXLE........58
AXLE SEALS
REMOVAL.............................61
INSTALLATION.........................61
BACK-UP LAMP SWITCH
REMOVAL.............................62
INSTALLATION.........................62
DIFFERENTIAL
DESCRIPTION.........................62
OPERATION...........................62
DISASSEMBLY.........................62
ASSEMBLY............................66
ADJUSTMENTS
ADJUSTMENT - DIFFERENTIAL TURNING
TORQUE............................69
ADJUSTMENT - DIFFERENTIAL SIDE GEAR
ENDPLAY...........................70
FLUID
STANDARD PROCEDURE
STANDARD PROCEDURE - FLUID LEVEL
CHECK.............................71
STANDARD PROCEDURE - FLUID DRAIN
AND FILL............................71
GEARSHIFT BOOT
REMOVAL.............................72
INSTALLATION.........................73GEARSHIFT CABLE - CROSSOVER
REMOVAL.............................73
INSTALLATION.........................76
ADJUSTMENTS
ADJUSTMENT........................79
GEARSHIFT CABLE - SELECTOR
REMOVAL.............................81
INSTALLATION.........................84
GEARSHIFT KNOB
REMOVAL.............................87
INSTALLATION.........................87
GEARSHIFT MECHANISM
REMOVAL.............................87
INSTALLATION.........................89
INPUT SHAFT
DESCRIPTION.........................93
DISASSEMBLY.........................93
ASSEMBLY............................96
INTERMEDIATE SHAFT
DESCRIPTION........................100
DISASSEMBLY........................100
ASSEMBLY...........................107
SHIFT COVER
DESCRIPTION........................113
SHIFT FORK AND SHAFT
DESCRIPTION........................113
SYNCHRONIZER
DESCRIPTION........................114
DISASSEMBLY........................114
CLEANING
CLEAN.............................114
INSPECTION
INSPECT...........................114
ASSEMBLY...........................114
VEHICLE SPEED SENSOR
REMOVAL............................115
INSTALLATION........................115
T850 MANUAL TRANSAXLE
DESCRIPTION
The NV T850 5-speed transaxle (Fig. 1) is a con-
stant-mesh manual transaxle that is synchronized in
all gear ranges, including reverse.The transaxle consists of three major sub-assem-
blies: the input shaft, intermediate shaft, and differ-
ential assembly. The transaxle shift system consists
of a mechanical shift cover, rails, forks, and cables.
The unique design of this shift system provides a
higher mechanical advantage, resulting in less fric-
tion and lower shift cable loads for smoother, more
positive operation.
RST850 MANUAL TRANSAXLE21-21
Page 1619 of 2585
Fig. 1 NV T850 Transaxle
1 - 3RD GEAR (SPEED) 9 - INTERMEDIATE SHAFT BEARING
(SEALED BALL)17 - 1/2 SYNCHRONIZER
2 - 3/4 SYNCHRONIZER 10 - REVERSE GEAR 18 - 1ST GEAR (SPEED)
3 - 3/4 SHIFT FORK 11 - 5/R SYNCHRONIZER 19 - DIFFERENTIAL ASSEMBLY
4 - 4TH GEAR (SPEED) 12 - 5/R SHIFT FORK 20 - EXTENSION HOUSING
5 - 5TH GEAR (INPUT) 13 - 5TH GEAR (SPEED) 21 - INTERMEDIATE SHAFT BEARING
(CAGED ROLLER)
6 - REVERSE IDLER GEAR 14 - 3/4 CLUSTER GEAR 22 - INTERMEDIATE SHAFT
7 - END COVER, REAR 15 - 2ND GEAR (SPEED) 23 - INPUT SHAFT
8 - INPUT SHAFT BEARING (SEALED
BALL)16 - 1/2 SHIFT FORK 24 - CASE
25 - INPUT SHAFT BEARING (ROLLER)
21 - 22 T850 MANUAL TRANSAXLERS
T850 MANUAL TRANSAXLE (Continued)
Page 1620 of 2585

The NV T850 transaxle is available with the 2.4L
Gas and 2.5L Turbo Diesel engine options. Unique
gearing tailored to the performance characteristics of
each engine provides optimum driveability, gradabil-
ity, and acceleration. The gear ratios are as follows:
GEARRATIO (2.4L
Gas)RATIO (2.5L
TD)
1st 3.65 3.65
2nd 2.05 2.05
3rd 1.39 1.37
4th 1.03 0.97
5th 0.83 0.76
Reverse 3.47 3.47
Final Drive
Ratio3.77 3.77
Overall Top
Gear3.12 2.67
TRANSAXLE IDENTIFICATION
NOTE: Since transaxles use unique gear ratios for
each of the two engine applications, it is imperative
that the transaxle is properly identified, and the cor-
rect transaxle assembly number is used when
ordering service parts.The transaxle model, assembly part number, build
date, and final drive ratio (FDR) can be found on a
metal tag fastened to the transaxle case on the bell-
housing (Fig. 2). A barcode label is also glued to the
transaxle bellhousing, and it too includes the trans-
axle part number.
Fig. 2 T850 Transaxle Identification
1 - TRANSAXLE BELLHOUSING
2 - BARCODE LABEL
3 - I.D. TAG
RST850 MANUAL TRANSAXLE21-23
T850 MANUAL TRANSAXLE (Continued)
Page 1621 of 2585
OPERATION
NEUTRAL
Engine power is transmitted to the input shaft via
the clutch assembly and the input shaft turns. Since
no synchronizers are engaged on either the input or
intermediate shafts, power is not transmitted to the
intermediate shaft and the differential does not turn
(Fig. 3).
Fig. 3 Neutral Gear Operation
21 - 24 T850 MANUAL TRANSAXLERS
T850 MANUAL TRANSAXLE (Continued)
Page 1622 of 2585
1ST GEAR
Engine power is transmitted to the input shaft via
the clutch assembly and the input shaft turns. The
input shaft first gear is integral to the input shaft,
and is in constant mesh with the intermediate shaft
first speed gear. Because of this constant mesh, the
intermediate shaft first speed gear freewheels untilfirst gear is selected. As the gearshift lever is moved
to the first gear position, the 1-2 fork moves the 1-2
synchronizer sleeve towards first gear on the inter-
mediate shaft. The synchronizer sleeve engages the
first gear clutch teeth, fixing the gear to the interme-
diate shaft, and allowing power to transmit through
the intermediate shaft to the differential (Fig. 4).
Fig. 4 1st Gear Operation
RST850 MANUAL TRANSAXLE21-25
T850 MANUAL TRANSAXLE (Continued)
Page 1623 of 2585
2ND GEAR
Engine power is transmitted to the input shaft via
the clutch assembly and the input shaft turns. The
input shaft second gear is integral to the input shaft,
and is in constant mesh with the intermediate shaft
second speed gear. Because of this constant mesh,
the intermediate shaft second speed gear freewheels
until second gear is selected. As the gearshift lever ismoved to the second gear position, the 1-2 fork moves
the 1-2 synchronizer sleeve towards second gear on
the intermediate shaft. The synchronizer sleeve
engages the second gear clutch teeth, fixing the gear
to the intermediate shaft, and allowing power to
transmit through the intermediate shaft to the differ-
ential (Fig. 5).
Fig. 5 2nd Gear Operation
21 - 26 T850 MANUAL TRANSAXLERS
T850 MANUAL TRANSAXLE (Continued)
Page 1624 of 2585
3RD GEAR
Engine power is transmitted to the input shaft via
the clutch assembly and the input shaft turns. The
input shaft third speed gear is in constant mesh with
the intermediate shaft 3-4 cluster gear, which is fixed
to the intermediate shaft. Because of this constant
mesh, the input shaft third speed gear freewheelsuntil third gear is selected. As the gearshift lever is
moved to the third gear position, the 3-4 fork moves
the 3-4 synchronizer sleeve towards third gear on the
input shaft. The synchronizer sleeve engages the
third gear clutch teeth, fixing the gear to the input
shaft, and allowing power to transmit through the
intermediate shaft to the differential (Fig. 6).
Fig. 6 3rd Gear Operation
RST850 MANUAL TRANSAXLE21-27
T850 MANUAL TRANSAXLE (Continued)