Dodge Neon / Neon SRT-4. Manual — part 304
TRANSAXLE
TABLE OF CONTENTS
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page
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T350 MANUAL TRANSAXLE
TABLE OF CONTENTS
page
page
T350 MANUAL TRANSAXLE
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DIAGNOSIS AND TESTING - COMMON
. . . . . . . . . . . . . . . . . . . . 3
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
. . . . . . . . . . . . . . . . . . . . . . . . . . 6
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
. . . . . . . . . . . . . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
. . . . . . . . . . . . . . . . . . . . . . . . . 19
. . . . . . . . . . . . . . . . . . . . . . . 20
. . . . . . . . . . . . . . . . . . . . . . . 21
AXLE SEAL
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
. . . . . . . . . . . . . . . . . . . . . . . . . 23
BACK-UP LAMP SWITCH
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
. . . . . . . . . . . . . . . . . . . . . . . . . 23
DIFFERENTIAL
. . . . . . . . . . . . . . . . . . . . . . . . . 24
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
ADJUSTMENT / SHIM SELECTION . . . . . . . . 31
DIFFERENTIAL BEARING CUPS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
. . . . . . . . . . . . . . . . . . . . . . . . . 32
FLUID
STANDARD PROCEDURE - FLUID DRAIN AND
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
GEAR SHIFT CABLE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
. . . . . . . . . . . . . . . . . . . . . . . . . 34
. . . . . . . . . . . . . . . . . . . . . . . . 36
GEAR SHIFT KNOB/BOOT ASSEMBLY
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
. . . . . . . . . . . . . . . . . . . . . . . . . 37
INPUT BEARING AND SLEEVE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
. . . . . . . . . . . . . . . . . . . . . . . . . 38
INPUT SHAFT
. . . . . . . . . . . . . . . . . . . . . . . . . 38
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
OUTPUT BEARING AND RACE
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
. . . . . . . . . . . . . . . . . . . . . . . . . 44
OUTPUT SHAFT
. . . . . . . . . . . . . . . . . . . . . . . . . 44
REAR BEARING OIL FEED TROUGH
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
. . . . . . . . . . . . . . . . . . . . . . . . . 45
SHIFT CROSSOVER LEVER
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
. . . . . . . . . . . . . . . . . . . . . . . . . 45
SHIFT CROSSOVER SHAFT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
. . . . . . . . . . . . . . . . . . . . . . . . . 46
SHIFT CROSSOVER SHAFT BUSHING
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
. . . . . . . . . . . . . . . . . . . . . . . . . 46
SHIFT MECHANISM
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
. . . . . . . . . . . . . . . . . . . . . . . . . 47
SHIFT RAIL BUSHINGS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
. . . . . . . . . . . . . . . . . . . . . . . . . 48
SHIFT SELECTOR SHAFT
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
. . . . . . . . . . . . . . . . . . . . . . . . . 48
SHIFT SELECTOR SHAFT BUSHING
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
. . . . . . . . . . . . . . . . . . . . . . . . . 48
PL/SRT-4
TRANSAXLE
21 - 1
SHIFT SHAFT SEALS
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
. . . . . . . . . . . . . . . . . . . . . . . . . 49
SYNCHRONIZER
. . . . . . . . . . . . . . . . . . . . . . . . . 49
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
. . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
VEHICLE SPEED SENSOR
. . . . . . . . . . . . . . 50
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
. . . . . . . . . . . . . . . . . . . . . . . . . 51
T350 MANUAL TRANSAXLE
DESCRIPTION
This five speed is a constant-mesh manual trans-
axle. All gear ranges, except reverse, are synchro-
nized. The reverse gear utilizes a brake and blocking
ring for shifting ease. The reverse idler gear is sup-
ported on a sliding spindle idler shaft. The transaxle
case is aluminum with a steel end–plate bearing
cover. It is housed in a die-cast aluminum case fea-
turing a two–piece, middle split design (Fig. 1).
The T350 transaxle internal components can be
serviced only by separating the gear case from the
bellhousing case.
CAUTION: The transaxle output shaft is serviced as
a unit. No disassembly and reassembly is possible.
Damage to the transaxle may result.
TRANSAXLE IDENTIFICATION
The transaxle model, assembly number, and build
date are on a metal I.D. tag that is attached to the
end cover of the transaxle (Fig. 2). This information
is also shown on a bar code label that is attached to
the front of the transaxle (Fig. 3).
NOTE: Transaxles use various final drive gear ratios
in different vehicle applications. Therefore, it is nec-
essary that the correct transaxle assembly number
is used when ordering service parts.
Fig. 1 T350 Manual Transaxle
1 - SHIFT LEVER
2 - CROSSOVER LEVER
3 - VENT
4 - REVERSE LAMP SWITCH
Fig. 2 Metal I.D. Tag
1 - METAL I.D. TAG
Fig. 3 Bar Code Label
1 - BAR CODE LABEL
21 - 2
T350 MANUAL TRANSAXLE
PL/SRT-4
GEAR RATIOS
CAUTION: All gears and shafts must not be inter-
changed with other transaxles; they will not func-
tion correctly.
The differential is a conventional arrangement of
gears that is supported by tapered roller bearings.
The final output gear turns the ring gear and differ-
ential assembly, thereby turning the drive axle
shafts.
The gear ratios of each transaxle are shown in the
following chart. The chart also shows which transax-
les are available with the reverse–input shaft brake.
This brake allows easier shifting into reverse and
helps eliminate reverse gear clash.
GEAR
1.6L
2.0L
2.0L R/T
1st
3.50
3.50
3.50
2nd
1.95
1.95
1.95
3rd
1.36
1.36
1.36
4th
0.97
0.97
0.97
5th
0.81
0.72/0.81*
0.81
FINAL
DRIVE
RATIO
3.94
3.55
3.94
REVERSE
BRAKE
YES
YES
YES
CLUTCH
RELEASE
SYSTEM
HYDRAULIC HYDRAULIC HYDRAULIC
* Export Models
GEARSHIFT PATTERN
The NV T350 (A-578) transaxle shift pattern is a
modified H–pattern (Fig. 4). Overdrive fifth and
reverse gears are in–line and outboard of the first
through fourth gear positions.
LUBRICANT/ADDITIVES
T350 transaxles use Mopar
t ATF+4 (Automatic
Transmission Fluid—Type 9602).Hypoid gear lube
or engine oil should not be used in this trans-
axle. Hard shifting effort, bearing, gear, and/or syn-
chronizer failure may occur if incorrect fluid is used.
The addition of any fluids to the transaxle, other
than the fluid listed above, is not recommended. An
exception to this policy is the use of special dyes to
aid in detecting fluid leaks. The use of transmission
sealers should be avoided, since they may adversely
affect seals.
SEALANTS
The sealant used to seal the transaxle case halves
and input bearing is Mopar
t Gasket Maker, Loctitet
518, or equivalent. The sealant used for the bearing
end plate cover is Mopar
t RTV.
DIAGNOSIS AND TESTING - COMMON
PROBLEM CAUSES
The majority of transaxle malfunctions are a result
of:
• Insufficient lubrication
• Incorrect lubricant
• Misassembled or damaged internal components
• Improper operation
HARD SHIFTING
Hard shifting may be caused by a misadjusted
crossover cable. If hard shifting is accompanied by
gear clash, synchronizer clutch and stop rings or gear
teeth may be worn or damaged.
Misassembled synchronizer components also cause
shifting problems. Incorrectly installed synchronizer
sleeves, struts, or springs can cause shift problems.
Worn, damaged, missassembled or leaking hydrau-
lic system/components can also cause difficult shift-
ing or gear clash.
NOISY OPERATION
Transaxle noise is most often a result of worn or
damaged components. Chipped, broken gear or syn-
chronizer teeth, and brinnelled, spalled bearings all
cause noise.
Abnormal wear and damage to the internal compo-
nents is frequently the end result of insufficient
lubricant.
SLIPS OUT OF GEAR
Transaxle disengagement may be caused by mis-
aligned or damaged shift components, or worn teeth
Fig. 4 T350 Transaxle Shift Pattern
PL/SRT-4
T350 MANUAL TRANSAXLE
21 - 3
T350 MANUAL TRANSAXLE (Continued)
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