Dodge Neon / Neon SRT-4. Manual — part 317
T850 MANUAL TRANSAXLE
TABLE OF CONTENTS
page
page
T850 MANUAL TRANSAXLE
. . . . . . . . . . . . . . . . . . . . . . . . . 52
. . . . . . . . . . . . . . . . . . . . . . . . . . . 55
DIAGNOSIS AND TESTING - COMMON
. . . . . . . . . . . . . . . . . . . . 61
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
. . . . . . . . . . . . . . . . . . . . . . . . . 66
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
. . . . . . . . . . . . . . . . . . . . . . . . . 83
. . . . . . . . . . . . . . . . . . . . . . . . . 85
SPECIAL TOOLS - T850 TRANSAXLE
AXLE SEALS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
. . . . . . . . . . . . . . . . . . . . . . . . . 90
BACK-UP LAMP SWITCH
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 91
. . . . . . . . . . . . . . . . . . . . . . . . . 91
DIFFERENTIAL
. . . . . . . . . . . . . . . . . . . . . . . . . 91
. . . . . . . . . . . . . . . . . . . . . . . . . . . 92
. . . . . . . . . . . . . . . . . . . . . . . . . 94
. . . . . . . . . . . . . . . . . . . . . . . . . . 96
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 96
ADJUSTMENT - DIFFERENTIAL TURNING
TORQUE . . . . . . . . . . . . . . . . . . . . . . . . . . . . 97
FLUID
STANDARD PROCEDURE - FLUID LEVEL
CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 99
STANDARD PROCEDURE - FLUID DRAIN
AND FILL . . . . . . . . . . . . . . . . . . . . . . . . . . . 100
GEAR SHIFT CABLE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 101
. . . . . . . . . . . . . . . . . . . . . . . . 103
. . . . . . . . . . . . . . . . . . . . . . . 103
GEAR SHIFT MECHANISM
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 104
. . . . . . . . . . . . . . . . . . . . . . . . 104
GEAR SHIFT KNOB
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 106
. . . . . . . . . . . . . . . . . . . . . . . . 106
INPUT SHAFT
. . . . . . . . . . . . . . . . . . . . . . . . 106
. . . . . . . . . . . . . . . . . . . . . . . . 106
. . . . . . . . . . . . . . . . . . . . . . . . . . . 110
INTERMEDIATE SHAFT
. . . . . . . . . . . . . . . . . . . . . . . . 114
. . . . . . . . . . . . . . . . . . . . . . . . 114
. . . . . . . . . . . . . . . . . . . . . . . . . . . 123
SHIFT COVER
. . . . . . . . . . . . . . . . . . . . . . . . 129
SHIFT FORK AND SHAFT
. . . . . . . . . . . . . . . . . . . . . . . . 130
SYNCHRONIZER
. . . . . . . . . . . . . . . . . . . . . . . . 131
. . . . . . . . . . . . . . . . . . . . . . . . 131
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 131
. . . . . . . . . . . . . . . . . . . . . . . . . . . 131
. . . . . . . . . . . . . . . . . . . . . . . . . . . 131
VEHICLE SPEED SENSOR
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 132
. . . . . . . . . . . . . . . . . . . . . . . . 132
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.
21 - 52
T850 MANUAL TRANSAXLE
PL/SRT-4
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)
PL/SRT-4
T850 MANUAL TRANSAXLE
21 - 53
T850 MANUAL TRANSAXLE (Continued)
The NV T850 transaxle is available with the 2.4L
Turbocharged Engine option. Its gear ratios are as
follows:
GEAR
RATIO
1st
3.65
2nd
2.05
3rd
1.37
4th
0.97
5th
0.76
Reverse
3.47
Final Drive Ratio
3.53
Overall Top Gear Ratio
2.67
TRANSAXLE IDENTIFICATION
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
21 - 54
T850 MANUAL TRANSAXLE
PL/SRT-4
T850 MANUAL TRANSAXLE (Continued)
OPERATION
NEUTRAL
Engine power is transmitted to the tinput shaft.
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
PL/SRT-4
T850 MANUAL TRANSAXLE
21 - 55
T850 MANUAL TRANSAXLE (Continued)
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