Three-Speed Dearborn Manual Transmission; Transmission; Column Shift And Back Drive Linkage; Floor Shift And Back Drive Linkage - Pontiac Grand Prix Service Manual

THREE-SPEED DEARBORN MANUAL TRANSMISSION
CONTENTS O F THIS SECTION
SUBJECT PAGE SUBJECT PAGE
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Description
7A- 1
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Periodic Service ?A-1
Transmission
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7A-
1
Shift Control
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?A-
1
On Car Adjustments
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?A-1
Column Shift and Back Drive
Linkage
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7A-1
Floor Shift and Back Drive Linkage
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?A-1
Minor Repairs
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7A-2
DESCRIPTION
This transmission is of the fully synchronized type with
all gears, except the reverse gear, being in constant
mesh.
It is used as the standard 3-speed for Pontiac and
Grand Prix and the heavy duty 3-speed for Tempest
and Firebird.
For all models, the steering column lock requires that
the transmission be in "Reverse" gear before the
ignition key may be removed. Also, the clutch safety
switch will not permit engine cranking unless the
clutch pedal is depressed far enough to completely
disengage the clutch.
PERIODIC SERVICE
TRANSMISSION
Extension Housing Bushing and Oil Seal
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.
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Major Repairs
Transmission
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Remove
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Input Shaft Seal
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R&R
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Transmission
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Disassemble.
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Transmission
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Assemble
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Transmission
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Replace
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Specifications
Special Tools
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ON CAR ADJUSTMENTS
COLUMN SHIFT AND BACK DRIVE LINKAGE (Fig.
%
,
1. Set gearshift lever in Reverse
and lock
ignition.
2. Loosen swivel clamp scfews "C" at transmission
shifter lever (Reverse and 1st) and "D" at cross shaft
assembly (view B).
3. Position front transmission shifter lever (2nd and
3rd) in Ndbtral position and rear transmission shifter
lever (Reverse and 1st) in Reverse position.
4. Tighten swivel clamp m e w "C" to 20 lb. ft., unlock
steering column and shift into Neutral.
5. Align gearshift lower control levers "E" and " F in
Neutral position and insert a .186-.185" diameter gage
pin through hole in lower control levers (view A).
6. Tighten swivel clamp "screw "D" to 20 lb. ft., remove
No periodic service of the transmission is required
gage pin and check complete shift pattern.
except checking for leaks and proper lubrication level
every 6000 miles.
FLOOR SHIFT AND BACK DRIVE LINKAGE (Figs.
If there is evidence of leakage, leak should be 7A-2 or 7A-3 and 7A-4A or 7A-40).
corrected and lubrication added as needed. Refill
capacity is 2 3/4 pints.
1. Position floor shift control lever in Neutral position.
Use SAE 90 Multi-purpose Gear Lubricant. No special
additive to this lubrication is required or recom-
2. Loosen adjusting swivel clamp on gearshift control
mended.
rod (Fig. 7A-4A or -4B), loosen trunnion jam nuts on
1st-Reverse and 2nd-3rd transmission control rods and
SHIFT CONTROL
insert a .250-.249" diameter gage pin into shifter
assembly (view "B" of Figs. 7A-2 or 7A-3).
NOTE: Gage pin in place will maintain shljier levers in
No periodic service of the shift control is required.
Neutralposi~ion.
Certain pdrts are lubricated on assembly and require
further lubrication only when parts become dry and
3. If shifter control lever is misaligned to its floor pan
sticky.
(console) opening (View "C" of Figs. 7A-2 or 7A-3):