Chevrolet 70 1969 Series, Shop Manual

Page: 757 / 913

TRANSMISSION AND CLUTCH 7-11
1. Synchronizer Outer Stop Ring
(Front)
2. Synchronizer Inner Ring and
Pin Assembly (Front)
3. Synchronizer Inner Ring and
Pin Assembly (Rear)
4. 4th Speed Gear Shims
5. 3rd Speed inner Ring and Pin
Assembly
to be up on the small shoulder on the 3rd speed gear
(12) which acts as a backing for the 3rd speed outer
stop ring (11); otherwise an erroneous reading will be
made. The clearance or “ axial float” of the 2nd and
3rd speed synchronizer should be between 0.070 - inch
and 0.090 - inch.
2. If the float is below 0.070 - inch it can be increased to
this am ount by removing the required am ount from
the small ends of the synchronizer pins by grinding or
by the use of a belt sander. Care should be taken to
remove the same am ount from each pin of both inner
rings (5 and 6). Removal of stock from the pins on
one inner ring only, will not increase the synchronizer
float. For example, assume that the subassembly
check on the synchronizer float shows only 0.060 -
inch. This is less than the required minimum of 0.070
- inch. Therefore, it will be necessary to remove at
least 0.010 - inch from the end of all six synchronizer
inner ring pins (5 and 6).
NOTE: In event the float is over 0.090 - inch,
select new parts for the assembly.
ASSEMBLY OF CONTROL COVER
Key numbers in text refer to Figure 3 unless otherwise
specified.
11. 3rd Speed Outer Stop
Ring
12. Mainshaft 3rd Speed
Gear
13. Mainshaft 4th Speed Gear
14. Synchronizer Outer Stop Ring
(Rear)
15. 4th and 5th Speed Sliding
Clutch
1. Install shift lug plungers (30) and springs (29) in 1st
speed shift lub (17) and reverse shift lug (98). Retain
parts in lugs with C-washers (18).
2. Hold control cover (21) in a vise and insert front end
of reverse shift rail (34) through hole at rear of cover
(21). Hold reverse shift fork (38) and reverse shift lug
F ig u re 1 4 — 4 t h S p e e d G e a r S h im s a n d C lu tc h G e a r In sta lle d
F ig u re 1 3 — M a in s h a f t a n d Parts A ss e m b le d
6. 2nd Speed Inner Ring and Pin
Assembly
7. Mainshaft 1st Speed Sliding
Gear
8. Mainshaft
9. Mainshaft 2nd Speed
Gear
10. 2nd and 3rd Speed Sliding
Clutch
CHEVROLET SERIES 70-80 HEAVY DUTY TRUCK SH O P M A N U A L