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76-6
1977 PONTIAC SERVICE MANUAL
4-SPEED 82MM BORG-WARNER TRANSMISSION
The four-speed Borg-Warner manual transmission is an
optional, heavy-duty, floor shift, four-speed manual
transmission used on the 400 cu. in. engine,
" F
Series.
This four-speed transmission (Fig. 7B-5) consists of two
basic sections: the transmission case and the case extension.
The transmission case contains the four forward speed gear
assemblies and their synchronizing mechanism; the case
extension contains the reverse gear assembly.
Gearshifting is manual through a floor-type gearshift
lever, which activates shift control rods connected to the
transmission cover shifter levers for first through fourth gears
and to the reverse lever located in the rear extension. The
shifter lever to the rear of the transmission cover controls the
1st and 2nd speed gears, while the lever to the front controls
the 3rd and 4th speed gears.
All four forward gears are provided with synchronizing
clutches which can be engaged while the car is in motion.
Gear ratios of 2.43 (first), 1.61 (second), 1.23 (third), 1.00
(fourth) and 2.35 (reverse) provide excellent ratio matching
with minimum loss of engine speed at the shift points. Reverse
gear is not synchronized; therefore, vehicle should be brought
to a complete stop before engaging reverse gear.
The transmission may be used as an aid in decelerating
by downshifting in sequence without double clutching or gear
clashing, due to all forward speeds being synchronized.
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