Chevrolet 10 Series 1968, Service Manual

Page: 479 / 713

CLUTCHES AND TRANSMISSIONS 7-16
The required operations will be obvious upon visual 4.
inspection of the vehicle. The instructions contained 5.
herein under "Rem oval” and “ Installation” will serve
as a guide in accomplishing transmission replacement.
6
.
It is important to note that vehicles covered by this 7.
section will have either an “ Apron” or “ S.A.E. #2”
type flywheel housing as shown in Figure 6 C. The 8 .
“ Apron” type flywheel housing is easily identified by the
sheet metal pan which covers the entire lower portion of
the clutch housing. Also, note the lack of a separate
9.
clutch housing.
The “ S.A.E. #2” type flywheel housing completely
surrounds the flywheel. A separate clutch housing is 10.
used in addition to the flywheel housing. Transmission
replacement procedures are different for each type fly ­
wheel housing used. 11 .
R e m o v a l
1. On transmissions equipped with remote controls,
^
disconnect control r o d s from shift levers at
transmission.
2. On transmissions having a conventional gearshift
lever, remove floor mat, remove transmission floor
pan cover, and then place gearshift lever in “ NEU­
TR A L ” position. Remove gearshift lever and control
tower assembly f r o m transmission, e x c e p t on
models
equipped with New Process or RT510
transmission.
Drain lubricant from transmission.
Disconnect speedometer cable from transmission
adapter.
Disconnect clutch control linkage.
Disconnect and remove parking brake lever and
controls (if used).
Disconnect propeller shaft from transmission as
described in “ PROPELLER SHAFTS” (Section 4) of
this manual.
Remove engine ground strap and battery cable sup­
port clip i f attached to transmission o r clutch
housing.
If vehicle is equipped with power take-off, remove
unit and controls from transmission. Place protec­
tive covering over opening.
On vehicles equipped with RT510 transmission, dis­
connect air-intake line from air filter on transmis­
sion. Place protective covering o v e r air filter
opening to prevent entry of dirt.
Position a suitable dolly or jack under vehicle and
adjust to carry weight of transmission.
NOTE:
On vehicles which have the rear engine
mountings attached to the clutch housing (except
models equipped with “ Apron” type flywheel
housing), position a suitable dolly jack under the
flywheel housing and adjust to carry the weight
of the engine. Remove rear engine mounts.
NOTE:
On conventional cab models with New
Process transmission, remove gearshift lever
using Tool (J-8109) as shown in Figure 1C.
Press down firm ly on tool and rotate counter­
clockwise to release gearshift lever.
On conventional cab models with RT510 trans­
mission, bleed air tanks, then remove range
shift control lines at air valve on transmission.
Remove gearshift lever and control tower as­
sembly from transmission.
Place protective
plugs or tape over air valve openings to prevent
entry of dirt.
Place clean lint-free cloth or other suitable cover­
ing over opening at top of transmission to prevent
entry of dirt or other foreign material.
“ APRON” TYPE
FLYWHEEL HOUSING
“ SAE # 2 ” TYPE
FLYWHEEL HOUSING
“APRON” TYPE “ SAE # 2 ” TYPE
F ig . 6 C —Flyw heel Housing Iden tification
13. Remove bolts attaching transmission to rear cross­
member support brackets (when used).
14. Visually inspect to determine if other equipment,
lines or brackets must be removed to permit re ­
moval of the transmission.
15. Remove clutch housing-to-engine flywheel housing
mounting bolts, except on models with “ Apron” type
flywheel housing.
NOTE:
On models equipped with “ Apron” type
flywheel housing, remove flywheel housing pan
and transmission-to-flywheel housing mounting
bolts. Be sure to support the clutch release
bearing and support assembly during removal
of the transmission from the flywheel housing.
This will prevent the bearing and support as­
sembly from falling-out of the flywheel housing
when the transmission is removed.
16. Move the transmission assembly straight away from
the engine, using care to keep the transmission main
drive gear shaft in alignment with the clutch disc
hub.
IM PORTANT: When removing the transmis­
sion, do not allow weight of the transmission to
hang on clutch disc hub, as disc will become
distorted, seriously affecting clutch operation.
17. When transmission is free from engine, lower the
transmission and move from under the vehicle.
18. If desired, a careful check of clutch components
should be made after the transmission has been r e ­
moved. If the clutch requires repair, r e f e r to
“ CLUTCHES” in this manual before transmission is
reinstalled in the vehicle.
CHEVROLET TRUCK SERVICE MANUAL