Chevrolet 10 Series 1970 Service Manual page 447

Procedure
1. R em ove the transm ission from the veh icle and com ­
p le te ly d isassem b le,
g ea r.
NOTE:
In any case where the clutch g e a r pilot
o r p ilo t b earin g is e x c e s s iv e ly loose or worn,
the p ilo t b earin g should
checking the tran sm ission case re a r bore align ­
ment by the dial indicator method.
2. C arefu lly install the sp ecial tool with the dial indi­
cator in the transm ission case with the face o f the
indicator to the re a r o f the case and with the tracing
fin g e r contacting the I.D. o f the case r e a r
Secure in place with a clutch gear bearing reta in er.
3. A ssem b le the transm ission case to the clutch housing
and tighten the four transm ission mounting bolts
secu rely.
NOTE:
Be sure to clean o ff any paint or other
fo reign m a teria l on
clutch housing and transm ission as any foreign
m aterial on these fa ces w ill change alignment;
also, check c a re fu lly
these m ating su rfaces and rem ove carefu lly as
necessary.
4. D ial indicate the tran sm ission case re a r bore and
re c o rd the indicator readings in the 12, 3, 6 and 9
o 'c lo c k positions.
NOTE:
It is best to start the reading at the
3, 6, 9 o r 12 o 'c lo c k position c lo sest to the point
where the indicator plunger reaches its m axi­
mum outward tra v e l.
" 0 " at this location and then re c o rd the 3, 6, 9
and 12 o 'c lo c k readings in rotation.
5. Install tem p ora ry slotted shim s between the tra n s­
m ission case and the clutch housing in the quantities
and at the bolt locations as n ecessary to bring m is ­
alignm ent at the transm ission case r e a r bore to a
maximum o f .005" indicator reading in either the
v e rtic a l o r h orizontal d irection .
EXAMPLE:
If the maximum indicator reading
is at the 12 o 'c lo c k position, put shims on the
two bottom bolts.
6. A fte r the position and quantity o f shims has been
determ ined and record ed the transm ission case may
be rem oved.
NOTE:
T h e clutch
except fo r the re v e rs e id le r
be rep laced b efore
bore.
the mating faces o f the
fo r dings or bu rrs on
Set the dial indicator at
housing should then b e
CLUTCHES AND TRANSMISSIONS 7-17
stamped, showing the position w here shim s a re
to be installed and the thickness o f shims at
each location.
7. Inspect the external clutching teeth of the clutch gear
and second speed gea r. Inspect the second and third
speed clutch internal clutching teeth. If the teeth a re
w orn o r tapered, even slightly, the gea rs should be
replaced. R eassem ble the transm ission.
8. Install the transm ission assem bly to the clutch hous­
ing, using the c o r r e c t number o f shims at the prop er
locations as p revio u sly determ ined. Shims a re a v a il­
able by unit part number with each unit consisting
o f the follow ing shims:
4 --.0 0 2 " shims Id en tification --tw o co rn ers cut off.
2 --.0 0 5 " shims Id en tification --on e corn er cut off.
1 --.0 1 0 " shims Id e n tifica tio n --a ll co rn ers square.
NOTE:
These sp ecial shim s have a tab on one
end fo r ease o f installation.
shims fo r the perm anent installation.
REAR OIL SEAL REPLACEMENT
1. Drain lubricant fro m transm ission.
2. Disconnect p r o p e lle r
d escrib ed in " P R O P E L L E R
this manual.
3. On 3-speed and W arn er 4 - speed tran sm ission s, p e r ­
fo rm the follow ing replacem ent procedu res:
a. Rem ove slip joint yoke from re a r o f tra n sm is­
sion mainshaft.
b. P r y seal out o f extension housing o r rem ove o il
seal using o il seal re m o ve r (J-5859) and slide
ham m er (J-2619) as shown in F igu re 4C.
c. Coat outer diam eter o f new o il seal with sealing
cement. Install new o il seal using extension hous­
ing o il seal in sta lle r (J-5154).
d. Install slip joint yoke on re a r o f tran sm ission
mainshaft.
4. On Muncie and New P r o c e s s 4-speed transm ission s,
p e rfo rm the follow ing:
a. R em ove parking brake from re a r o f tran sm ission
as d escribed in "P A R K IN G B R A K E " (Section 5),
when used.
b. Disconnect speedom eter cable and rem ove speed­
om eter d riven gea r from mainshaft re a r bearin g
cap.
c. Using flange o r yoke holding tool, rem o ve the out­
put yoke o r companion flange nut.
yoke o r companion flange nut o ff the mainshaft.
d. Rem ove m ainshaft rea r bearing cap and gasket.
D iscard gasket.
e. Rem ove o il seal from rea r bearing cap. D iscard
o il seal.
f . Coat outer diam eter o f new o il seal with sealing
cem ent. Install o il seal in re a r bearin g cup using
a suitable in s ta ller. D rive seal flush with outside
o f re a r bearing cap, being carefu l not to damage
seal as shown in F igu re 5C.
NOTE:
On Muncie
22834 with A dapter J-22834-1 as required.
g. Clean a ll gasket surfaces, then install the re a r
bearing cap with a new gasket on the tran sm is­
sion. Tighten cap screw s fir m ly .
Do not slot the
shaft fro m tran sm ission as
S H A F T S " (Section 4) o f
P u ll output
4 - speed use In sta ller J-
CHEVROLET TRUCK SERVICE MANUAL