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TURBO HYDRA-MATIC 350 TRANSMISSION
7A3-1
SECTION 7A3
TURBO HYDRA-MATIC 350
TRANSMISSION
CONTENTS OF THIS SECTION
PAGE
General Description
..............................................................................................
7A3- 1
Diagnosis
...................................................................................................................
7A3-2
Maintenance and Adjustments
..............................................................................
7A3-14
On-Car Service
....................................................................................................
7A3- 1 8
Unit Repair
.............................................................................................................
7A3-21
Specifications
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7A3-58
GENERAL DESCRIPTION
The Turbo Hydra-matic 350 transmission, see Fig. 7A3-
1, is a fully automatic unit consisting primarily of 3-element
hydraulic torque converter and two planetary gear sets. Four
multiple-disc
clutches,
two
roller
clutches
and
an
intermediate overrun band provide the friction elements
required to obtain the desired function of the two planetary
gear sets.
A hydraulic system pressurized by a gear type pump
provides the working pressure required to operate the friction
elements and automatic controls.
External control connections to the transmission are:
1. Manual Linkage
-
To select the desired operating
range.
2. Engine Vacuum
-
T o operate the vacuum modulator.
3. Cable Control
-
T o operate the detent valve.
The following shift points are approximate and vary
depending on rear axle ratio.
In Drive-range at minimum throttle, the 1st shift will
occur at 9-14 rnph and the 2nd shift at 15-20 mph. At
maximum throttle, the 1st shift will occur at 40-55 rnph and
the 2nd shift at 65-70 mph.
The detent valve is activated by a cable that is connected
to the carburetor linkage. When the throttle is half open, the
valve is actuated causing throttle downshifts at speeds below
50 mph. When the throttle is fully open, the detent valve is
actuated causing the transmission to downshift. The
maximum throttle 3-1 downshift will occur at approximately
8 to 12 rnph below the maximum throttle 1-2 upshift point.
The maximum throttle 3-2 downshift will occur at
approximately 4 to 8 rnph below the maximum throttle 2-3
upshift point.
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