Chevrolet 1980 Light Duty Truck Repair Manual page 72

4B-2 REAR AXLE DIFFERENTIAL
TRUCK REAR AXLE IDENTIFICATION
All rear axles used in Chevrolets are stamped with a prefix code designating the axle ratio and vehicle
identification, build date, axle source, and shift code.
EXAMPLE:
Axle & Vehicle
Code
See Chart Below
603560-1
EXAMPLE:
MONTH
DANA P/N
CODE
The Dana Part num ber and build date are stamped on the rear surface of the right hand axle tube. In
addition, the three digit axle code appears on a strip of tape attached to the outboard end of the axle tube.
5. Check fit o f differential side gears in case.
D iffe re n tia l B earing R eplacem ent
1. Install T ool J-22888 and A dapter Plug J-8 107-4,
assuring puller legs are fitted securely in notches in case and
against bearing cone, as shown in figure 3B.
2. Tighten puller screw to remove bearing.
3. Place new bearing on hub with thick side o f inner
race toward case and drive into place, using J-22175 for
8-7/8" or J-22761 for 8-1/2" ring gear and Driver Handle
J-8092, as shown in figure 4B.
4. Before bearing installation on opposite hub, support
differential case on A dapter Plug J-8107-4. This allow s
differential case to rest on adapter instead o f bearing cage.
See figure 4B. Install remaining bearing as instructed in step
O V E RH AU L M A N U A L
RAA
Day Code
Jan. 1 = 001
C
G
K
W
29
DAY CODE MODEL
YEAR
Ring G ear or D iffe re n tia l Case R eplacem ent
and a hammer, tap ring gear off the case.
surface which mates with ring gear. Clean all surfaces.
lubricant. Pre-align ring gear and differential case bolt
holes, and press on adaptor plug J -8 107-4 to initially start
ring gear on case pilot, as shown in figure 5B.
m aintain bolt hole adlignment. Draw up all bolts evenly,
using a criss-cross pattern to avoid cocking the gear on the
case.
T I
Source Code Shift Code
= Buffalo
= Gear & Axle
= G M of Canada
= Warren
8
SHIFT CODE
1. R em ove the ring gear bolts and, using a soft drift
NO TICE:
D o not attempt to pry ring gear from case.
To do so may dam age m achined surfaces.
2. R em ove any nicks or im bedded dirt from case flange
3. Liberally coat the differential case pilot with hypoid
4. Start all ring gear bolts during initial assembly to
1
1st Shift
PRODUCTION
LINE CODE