Chevrolet 1973 Overhaul Manual page 244

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Extension Oil Seal or Bushing
If bushing in rear of extension requires replacement,
remove seal and use Tool J-5778 to drive bushing into
extension housing (fig. 12X). Using the same tool, drive
new bushing in from the rear. Coat I.D. of bushing and
seal with transmission lubricant, then install new oil seal
using Tool J-5154 (fig. 13X).
Clutch Gear Bearing Retainer Oil Seal
If the lip seal in the retainer needs replacement; pry the
oil seal out (Fig. 14X) and replace with a new seal using
Tool J-23096 until seal seats in its bore (Fig. 15X).
NOTE: Lip of seal must face rear of bearing
retainer.
ASSEMBLY OF M AINSH AFT (Fig. 16X)
Turn the front of the mainshaft upward. Install the
following components on the mainshaft:
1. Install the third speed gear with clutching teeth
upward; the rear face of the gear will butt against
the flange on the mainshaft.
2. Install a blocking ring with clutching teeth
downward over the synchronizing surface of the
third speed gear. All four blocker rings used in this
transmission are identical.
3. Install the 3rd and 4th synchronizer assembly with
the fork slot downward; push assembly onto splines
on the mainshaft until it bottoms out against flange.
Drive Gear Bearing
Drive Gear
Mainshaft Pilot
Bearings
3-4 Synchronizer
Asse mbly
Third Speed Gear
Second Speed Gear
1-2 Syn chronizer and
Reverse Gear A ssembly
Fig. 16X--Clutch Gear and Mainshaft Details
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CLUTCHES A N D M A N U A L T R A N S M IS S IO N S
8. First Speed Gear
9. Thrust Washer
10. Spring Washer
11. Rear Bearing
12. Speedo Drive Gear
13. Mainshaft
14. S nap R in g
15. Syn ch ro nizing
" B l o c k e r " Rin g
Be sure the notches o f the blocker
CAUTION:
ring align with the keys o f the synchronizer
assembly.
4. Install synchronizer hub to mainshaft snap ring (fig.
7X). Both synchronizer snap rings are identical.
Turn the rear of the mainshaft upward. Install the
following components on the mainshaft:
Fig. 17X-lnstalling Rear Bearing
7 M - 2 5
OVERHAUL MANUAL