Chevrolet 70 1969 Series, Shop Manual

Page: 787 / 913

TRANSMISSION AND CLUTCH 7-41
1. Install mainshaft assembly (22) in transmission case
by tilting rear end of the assembly down and lowering
into and through opening in rear of case, which is
provided for the mainshaft rear bearing (23). Lower
front end in line with pilot bearing opening (6). Move
mainshaft assembly forward into position.
2. Position mainshaft rear bearing (23) over end of
mainshaft (22) with snap ring in outer race of bearing
(23) facing rear.
3. Using suitable installer tool and ham m er drive m ain­
shaft rear bearing (23) on mainshaft (22) and into
transmission case until snap ring on bearing contacts
case.
4. Position main drive gear and bearing assembly (5)
into front of case so that drive gear engages and
meshes with countershaft drive (43) and snap ring on
bearing (5) contacts transmission case. It may be ne­
cessary to use a suitable sleeve and ham m er to drive
gear and bearing into place.
5. Install main drive gear bearing cap with new gasket
(47) on transmission case. Tighten bolts firmly.
IMPORTANT: Oil return hole in bearing cap
must line up with oil hole in transmission case.
6. Install clutch throw-out bearing return spring clip
under head of bolt when installing bearing cap.
7. Lock transmission gears into two speeds at the same
time to lock up the transmission; then tighten coun­
tershaft rear bearing retaining nut (31). After nut is
driven up tight, stake nut in position with punch and
hammer.
8. Install countershaft rear bearing cap (30) and new
MAINSHAFT INSTALLATION
gasket (33). Tighten bolts firmly.
9. Install speedometer drive gear spacer (26) and drive
gear (27) (if used) on mainshaft (22).
10. Install mainshaft rear bearing cap (25) and new gask­
et (24). Tighten bolts firmly.
11. Install parking brake drum (if used) and companion
flange on rear end of mainshaft.
12. With transmission still locked up in two speeds at the
same time install companion flange nut. Tighten nut
to 250 foot-pounds torque and install a new cotter
pin.
SHIFTER BAR HOUSING INSTALLATION
1. If previously removed, install P.T.O. covers and new
gaskets. Tighten bolts firmly.
2. With transmission in “ N eutral,” position shift bar
housing (14) and new gasket on transmission case. Be
sure shift forks engage gear slots.
3. Install shift bar housing to transmission case attach­
ing bolts and lock washers.
4. Install parking brake parts (if used) as directed in
BR A K E S (SEC. 5) of this manual.
CONTROL TOWER INSTALLATION
NOTE: On transmissions having a conventional
gearshift lever, accomplish the following:
1. With transmission in “ N eutral,” position a new gask­
et on shift bar housing (14).
2. Place shift control lever in shifter shaft collar; then
install shift lever pivot bolt, nut, and lock washer at­
taching control lever to anchor bracket. Tighten nut
to 25-31 foot-pounds torque.
SPECIFICATIONS
GENERAL DATA
M ake........................................................................................ Clark
Type................................................................5-Speed Synchromesh
Models................................................. 325V-1, 325V-2, and 327V-1
Clutch Housing.....................................................S.A.E. # 2 and 3
GEAR RATIOS—ALL RATIOS ARE (to 1)
Transmission Model
1st...........................................................................
2nd.........................................................................
3rd...........................................................................
4 th ...........................................................................
5 th...........................................................................
325V 327V
.7.01 6.27
. 3.97 3.55
2.34 1.89
1.42 1.18
1.00 1.00
Reverse........................................................................... 5.71 5.11
Reverse Idler Gear (2)
Type............................................................................................. Roller
Number Rollers............................................................................... 12
Make and Num ber................................................... Hyatt # 94726
Outside Diam.............................................................. 1.750” - 1.751”
Inside Diam..............................................................1.2495” - 1.2500”
W idth........................................................................................... 1.625”
Main Drive Gear
Type................................................ Single Row Ball w/Snap Ring
Make and N um ber................................... New Dept. 47513-XIA
Outside Diam....................................................... 4.7238” - 4.7244”
Inside Diam............................................................ 2.5585” - 2.5591”
W idth.............................................................................9050” - .9055”
BEARINGS (NEW LIMITS)
Mainshaft Pilot
Type.......................................................................................... Roller
Number Rollers............................................................................... 12
Make and N um ber................................................Hyatt SRA-5206
Inside Diam. of Cage............................................................... 1.635”
Mainshaft Rear
Type................................................ Single Row Ball w/Snap Ring
Make and Num ber.......................................... M RC#310-SG-I
Number Balls and Size.....................................................(8)—3/4”
Outside Diam....................................................... 4.3307” - 4.3301”
Inside Diam........................................................... 1.9680” - 1.9685"
W idth............................................................................9005” - .9055”
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK S H O P M A N U A L