Chevrolet 70 1969 Series, Shop Manual

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TRANSMISSION AND CLUTCH 7-56
3. Tip rear end of countershaft assembly (34) down and
lower into transmission case, running rear of counter­
shaft through opening for countershaft rear bearing
(32) in rear of case far enough so front of counter­
shaft can be lowered into position. Push countershaft
(34) forward into position in front bearing (44).
4. Using suitable installer tool, install countershaft rear
bearing (32). Be sure snap ring is in position in groove
of outer race of bearing. Press Bearing into place on
countershaft (34) with snap ring toward rear. Press
bearing into transmission case until snap ring contacts
the case.
5. Install countershaft rear bearing retainer nut (31)
loosely.
R EVERSE IDLER G E A R IN ST A LLA T IO N
1. Insert one reverse idler gear bearing (36) in reverse
idler gear (35); then install bearing spacer (37) and
the second bearing (36) in bore of idler gear.
2. Install the reverse idler gear assembly (35) in trans­
mission case with chamfered teeth on gear toward
rear of case.
3. Insert reverse idler shaft (38) through opening in rear
of transmission case, into reverse idler gear (35) and
into forward support boss. Make sure groove for the
retainer lock in rear of idler shaft is at bottom of
shaft (38). Drive shaft in until inner edge of groove is
flush with transmission case. Install retainer lock with
bolt and lock washer. Tighten bolt securely.
M A IN S H A F T IN ST A LL A T IO N
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 the rear.
3. Using suitable installer tool and hammer drive main­
shaft rear bearing (23) on mainshaft (22) and into
transmission case until snap ring on bearing contacts
case.
4. If not previously installed, slide mainshaft pilot bear­
ing (6) into position on front of mainshaft (22).
5. Position main drive gear and bearing assembly (5)
into front of case so that drive gear engages and
meshes with countershaft drive gear (43) and snap
ring on bearing (5) contacts transmission case. It may
be necessary to use a suitable sleeve and hammer to
drive gear and bearing into place.
6. Install main drive gear bearing cap with new gasket
(47) on transmission case. Tighten bolts firmly.
IM P O R T A N T : O il return hole in b e a r in g c a p m ust
line u p w ith oil hole in tran sm issio n case.
7. Install clutch throw-out bearing return spring clip
under head of bolt when installing bearing cap.
8. 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.
9. Install countershaft rear bearing cap (30) and new
gasket (33). Tighten bolts firmly.
10 Install speedometer drive gear spacer (26) and drive
gear (27) (if used) on mainshaft (22).
11. Install mainshaft rear bearing cap (25) and new gask­
et (24). Tighten bolts firmly.
12. Install parking brake drum (if used) and companion
flange on rear end of mainshaft.
13. 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 BA R H O U S IN G IN ST A LL A T IO N
1. If previously removed, install P .T .O . covers and new
gaskets. Tighten bolts firmly.
2. With transmission in “ Neutral,” 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
B R A K E S (SEC . 5) of this manual.
C O N T R O L T O W E R IN ST A LL A T IO N
N O T E : O n tran sm issio n s h a v in g a c o n v e n tio n a l
g e a rsh ift lever, a cco m p lish th e fo llo w in g :
1. With transmission in “ Neutral,” position a new
gasket on shift bar housing (14). Position shift control
anchor bracket on control. Install attaching bolts and
lockwashers.
2. Place shift control lever in shifter shaft collar; then in­
stall shift lever pivot bolt, nut, and lock washer attach­
ing control lever to anchor bracket, tighten nut to 25-31
foot-pounds torque.
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK S H O P M A N U A L