Chevrolet 70 1969 Series, Shop Manual

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CLARK 5-SPEED TRANSMISSION
(MODELS 282 AND 285)
INDEX
TRANSMISSION AND CLUTCH 7-16
Trunsmission O verhaul................................................. "7-15
Disassembly of T ransm ission............................... 7-15
Mainshaft R em oval............................................ 7-15
Reverse Idler Gear R em oval........................... 7-15
Countershaft R em ov al....................................... 7-15
Overhaul of Subassem blies.................................. 7-15
Mainshaft Disassem bly..................................... 7-15
Shift Bar Housing Disassem bly.................... 7-17
Cleaning and Inspection....................................................7-18
Main Drive Gear Disassembly and Assembly . . . 7-24
Shift Bar Housing A ssem bly.......................................7-24
Clutch Housing or Countershaft Front
Bearing R eplacem ent.................................................7-25
Mainshaft A ssem bly......................................................7-26
Assembly of T ransm ission..........................................7-27
TRANSMISSION OVERHAUL
IMPORTANT: Cleanliness is extremely important
and an absolute must when repairing or over­
hauling the transmission. Before attempting
overhaul procedures, thoroughly clean exterior
of the transmission with cleaning solvent to
prevent dirt from getting into the gear mecha­
nism.
NOTE: Clutch housing should not be removed
from transmission case unless housing or case
require replacement, or unless the countershaft
front bearing requires replacement.
DISASSEMBLY OF TRANSMISSION
(Fig. 2N and 3N)
1. Remove control top or remote control assembly.
2. Remove shift rod cover capscrews and cover.
3. Remove shift rod support assembly retaining bolts
and assembly from case (fig. 2N).
C A U T IO N : Be careful not to lose lack springs
a n d balls from support.
Mainshaft Removal
1. Remove parking brake and drum assembly. Refer to
Brakes, Section 5, Service portion of this Manual.
NOTE: Lock transmission in two gears before
removing brake drum retaining nut (fig. 4N).
2. Remove bolt and lock washer assemblies; then re­
move rear bearing cap and speedometer drive gear.
Discard gaskets (fig. 5N).
3. Remove bolt and lock washer assemblies; then re­
move countershaft rear bearing cap and gasket. Dis­
card gasket.
4. Using snap ring pliers, remove countershaft rear bear­
ing retaining snap ring (fig. 6N).
5. Remove main drive gear bearing cap and main drive
gear (fig. 7N).
NOTE: Use caution as not to drop mainshaft
spigot bearing rollers in transmission case.
6. Pry mainshaft assembly to rear of transmission case
to expose rear bearing. Remove snap ring from bear­
ing, using a suitable puller, remove rear bearing (fig.
8N).
7. Raise front end of mainshaft to clear case, then re­
move the mainshaft assembly.
Reverse Idler Gear Removal
1. Remove reverse idler lockscrew and lock.
2.
Using a suitable puller remove reverse idler shaft (fig.
9N).
3.
Remove reverse idler gear, bearings, and two spacers
from case (fig. ION).
Countershaft Removal
1. Pry countershaft to the rear to expose rear bearing
and remove snap ring from bearing.
2 .
Using a suitable puller, remove countershaft rear
bearing and oil slinger (fig. I IN).
3.
Raise forward end of countershaft and lift assembly
from case.
OVERHAUL OF SUBASSEMBLIES
Mainshaft Disassembly
1. Remove mainshaft 1st and reverse sliding gear. Set
mainshaft in a vise with copper or brass jaws so
splines will not be damaged.
CHEVROLET SERIES 70-80 H EAVY DUTY TRUCK SH O P M A N U A L