Chevrolet 1963 Corvette, Руководство по ремонту и настройке

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212 CLUTCH AND TRANSMISSION
naw 3-speed, Muncie 4-speed, and the War-
ner 4-speed. Identification is determined by
the side cover design and linkage. The 3-speed
Muncie side cover has two bolts on the side
cover top edge and the Saginaw 3-speed one.
The Muncie and Warner 4-speeds have the
reverse fork mounted in the tailshaft. These
two may be differentiated by the shape of the
side cover; the Warner has a nine bolt curved
bottom and the Muncie a seven bolt straight
bottom.
1984 models use a new, computer-con-
trolled 4-speed overdrive manual transmis-
sion, which is essentially a combination of two
separate transmissions. The first is a conven-
tional 4-speed (83MM) manual system with a
1:1 ratio in 4th gear. The second is a two-
speed (overdrive) system electronically con-
trolled by the electronic control module
(ECM), which operates with a 1:1 or a .68 to
one ratio. By combining these two transmis-
sions, the complete unit is actually capable of
operating with seven separate gear ratios; one
of which is an overdrive. The two-speed, or
overdrive unit performs its function using a
planetary gear system in combination with two
sets of clutch packs.
The operation of these clutch packs is con-
trolled by a hydraulic circuit which causes the
movement of the -main finger plate via a pis-
ton and accumulator assembly. The accumu-
lator is used to regulate the speed at which
the piston moves, and thus, the speed of the
complete shift from direct to overdrive or vice
versa. This also serves to reduce shock-load-
ing during speed shifting. The ECM is pro-
grammed to control the shift solenoid and
thus, the entire overdrive unit. It does this
by monitoring both vehicle speed and throt-
tle position. The overdrive mode cannot oc-
cur when the 4-speed transmission is in first
gear. Overdrive is automatically engaged at
speeds above 110 mph. The overdrive mode
can be forced off by means of a switch on the
vehicle console.
REMOVAL AND INSTALLATION
1963-65 Muncie Three-Speed and 1963
Borg-Warner T-10, Four-Speed
1. Jack the car high enough to provide
working clearance.
2. Disconnect the speedometer cable
from the transmission. Support with jack-
stands.
3. Disconnect the shift linkage from the
shift rods on the transmission. Remove'the
shift lever assembly and linkage.
4. Remove the driveshaft as described in
the driveshaft section of Chapter 7.
5. Support the engine at the rear of the
oil pan with a jack.
6. Remove the left and right exhaust
pipes.
7. Remove the transmission tailshaft-to-
crossmember attaching bracket.
8. Remove the two top transmission-to-
bell housing bolts and replace them with two
guide pins; these may be fabricated from
studs. This will prevent damaging the clutch
disc.
9. Remove the bottom two bolts and slide
the transmission straight back on the guide
pin until the input shaft is clear of the clutch
splines.
10. Move the transmission back to clear the
bell housing; Tilt the forward end of the
transmission down and withdraw from the car.
11. To install, insert a guide pin in the up
per right bell housing bolt hole.
12. Raise the transmission and support it
on the guide pin.
13. Rotate the transmission and engage the
input shaft with the clutch disc. Slide the
transmission forward until it bottoms against
the clutch housing.
14. Install the two, bottom transmission-
to-bell housing bolts. Remove the guide pin,
and install the top two bolts. Torque all four
bolts to 40-50 ft. Ibs.
15. Position the tailshaft mount-to-frame
crossmember bracket and install the bolts
hand tight. Install the bracket-to-extension
mount bolts.
16. Tighten the support bracket-to-frame
retaining bolts. Remove the jack from under
the oil pan and tighten the bracket-to-exten
sion mount bolts.
17. Install the driveshaft.
18. Install the speedometer cable to the
transmission.
19. Install the shift lever assembly onto the
transmission and connect the shift linkage.
20. Refill the transmission with lubricant.
Check and adjust the shift pattern, if neces
sary.
1963-81 Four-Speed and 1966-69 Three-
Speed
1. Disconnect the negative cable from the
battery.
2. Disassemble the shift lever. Unscrew
the ball from the lever, lift out the "T" handle