Chevrolet 70 1969 Series, Shop Manual

Page: 838 / 913

TRANSMISSION AND CLUTCH 7-92
slot in lever aligns with rock shaft cross holes.
ASSEMBLY OF CONTROL TOWER
4. Align slot and start rock shaft (8) through hole in
control tower and slot of shift lever.
(Key N u m bers Refer to Figure 4) 5- Insta11 rock shaft snaP rin8 (7) in groove of control
tower. This will hold the rock shaft in position during op­
eration of the gearshift leve.
N O T E : T he control to w e r a n d ge a rsh ift lever a s-
6. Install a new felt ring (5) on control tower,
se m b ly is used on tran sm issio n s installed in con-
7. C o at inside of com pression cup with transm ission lu-
v e n tio n al c ab m odels.
bricant and slide cup down over lever into position on
control tower.
1. Position control tower (6) on edge in soft jaw ed vise. 8. Position spring (3) and com pression collar (21) on
2. Lubricate 1st and reverse shift finger (9), with trans- shift lever. Depress compression collar and insert pin (2)
mission lubricant and install shift finger in control tower through collar and shift lever.
using shift finger stud (10), washer (17) and nut (18). 9. Position grom m et (23) on gearshift lever and over
C heck operation, as shift finger m ust rotate freely. control tower com ponents.
3. Position gearshift lever (22) in control tower so that 10. Install gearshift knob (1) on gearshift lever.
ASSEMBLY OF T RA N SM ISSIO N
N O T E : All g e a r s sh ou ld be lubricated w ith
tran sm issio n lu b rican t (S.A .E. 5 0 e n g in e oil of
g o o d q u a lity ), prior to installation in the tran s­
m ission case.
INSTALLATION OF COUNTERSHAFT
(Key N um bers Refer to Figure 1)
1. Using a suitable sleeve, start countershaft front
bearing (61) into bore of transm ission case (56). P o­
sition countershaft front bearing retainer against
bearing and tap into case until edge of retainer is
flush with case.
N O T E : Be sure to coat ou ter e d g e of b e a r ­
in g retainer w ith s e a lin g cem ent.
2. Lower countershaft assembly into transm ission case,
guiding rear end of shaft (55) out through rear bearing
bore of case.
3. M ove countershaft assembly forward, guiding front
end of shaft into countershaft front bearing.
IM P O R T A N T : To pre ven t d a m a g e to coun ter­
s h a ft front b e a rin g , position tw o strips of flat
steel stock, a p p ro x im a te ly 3 /8 -in c h thick, b e ­
tw e e n cou n tersh aft drive g e a r (5 7 ) a n d w a ll of
case.
4. Since countershaft rear bearing (37) should fit tight
on countershaft, use suitable sleeve to drive against bear­
ing inner race. Seat bearing on shaft, then remove steel
strips and tap bearing into bore seating snap ring (40)
against case.
5. H and-tighten countershaft rear bearing nut (39)
against bearing.
INSTALLATION OF REVERSE
IDLER GEAR
(Key N um bers Refer to Figure 1)
1. Position reverse idler gear bearings (45) in reverse
idler gear (46)
2. Position idler gear, bearings, and thrust washers (44
and 47) in case, with large gear on idler gear tow ard front
of case. M esh idler gear with countershaft and align bore
of bearings with hole in transm ission case.
NOTE:
Be sure the ta n g on each thrust w a s h e r
fits into th e dep ression p ro v id e d in the tra n s­
m ission case.
3. Insert reverse idler gear shaft (42) in rear of case, not­
ing that “ flat” on shaft is squared tow ard countershaft for
proper lock by countershaft rear bearing cap (38).
4. Set countershaft rear bearing cap in place to check
lock of reverse idler shaft. Secure bearing cap with two
finger-tight cap screws to keep countershaft in place d u r­
ing installation of mainshaft.
INSTALLATION OF M A IN
DRIVE GEAR
(Key N um bers Refer to Figure 1)
1. Using a suitable tool, tap m ain drive gear and bearing
assembly into transm ission case.
N O T E : T a p b e a rin g until s n a p rin g is flush w ith
case.
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK S H O P M A N U A L