Pontiac FIREBIRD 1972 Service Manual page 851

7B- 12 1972 PONTIAC SERVICE MANUAL
I
I
Fig. 78-9 Removing Reverse Idler Shaft
6. Remove main drive gear bearing retainer bolts and
lock washers
(4),
bearing retainer and gasket.
7. Remove bearing-to-main drive gear stem snap ring
and remove main drive gear from inside of case by
gently tapping on pilot end of main drive gear.
8. Remove oil slinger from main drive gear stem and
unload sixteen (16) mainshaft pilot bearings from
main drive gear cavity.
9. Slip main drive gear bearing out front of case. Since
bearing is a slip fit on main drive gear stem and in
case bore, it may be necessary to aid removal with a
screwdriver between case and bearing outer snap
ring.
10. Using drift or other suitable tool, drive countershaft
and its woodruff key out rear of case.
86
11. Remove countergear and its two (2) tanged thrust
washers from each end of the countergear.
12. If transmission side cover requires disassembly, pro-
ceed as outlined under MINOR REPAIRS.
MAINSHAFT
DISASSEMBLE (Fig.
78-1
1
)
Depress speedometer drive gear retaining clip and
slide gear from mainshaft.
With front of mainshaft upward, remove 3rd speed
blocker ring and, using snap ring pliers, remove 2nd
& 3rd synchronizer hub snap ring from mainshaft.
Support 2nd speed gear with press plates and press on
front of mainshaft to remove 2nd & 3rd synchronizer
assembly, 2nd speed blocker ring and 2nd speed gear
from mainshaft.
From other end of mainshaft remove rear bearing
snap ring from mainshaft groove and, supporting re-
verse gear with press plates, press on rear of main-
shaft to remove reverse gear, thrust washer and rear
bearing from mainshaft. Use care when pressing so
that reverse gear, thrust washer and raar bearing are
centered on mainshaft.
Remove 1st & Rev. synchronizer hub snap ring from
mainshaft.
Support 1st speed gear with press plates and press on
rear of mainshaft to remove 1st & Rev. synchronizer
assembly, 1st speed blocker ring and 1st speed gear
from mainshaft.
TRANSMISSION
CLEANING
1. During overhaul procedures, all components of
transmission (except bearing assemblies) should be
thoroughly cleaned with cleaning solvent and dried
with air pressure 'prior to inspection and reassembly
of transmission.
2. Rer?ove all portions of old gaskets from parts by
using a stiff brush or scraper.
3. Clean bearing assemblies as follows:
Fig. 78-10 Separating Extension Housing From Mainshaft
Assembly
a. Since careful and proper cleaning of bearings is
very important, they should always be cleaned
separately from other parts.