Chevrolet 1977 light duty truck Service Manual page 359

1. U n iv e rs a l J o in t Y o ke
P in io n B e a rin g O il
2
S e al and R e ta in e r
3 O il Seal
4.
O il S e al G a s k e t
5. F ro n t P in io n B e a rin g
6 D riv e P in io n
7. R e ar P in io n B e a rin g
S T A N D A R D DIFFERENTIAL
Noise
T he most essential p a rt o f re a r axle service, as with
any mechanical repair,
problem, and, in axle work one o f the most difficult areas
to diagnosis is noise. Locating a broken axle shaft, or
broken differential gear, presents little or no problem,
8. R in g G e a r T h ru s t Pad
9. R in g G ear
10.
D iffe r e n tia l S p id e r
11.
D iffe r e n tia l P in io n
(S p id e r) G ear
12. D iffe r e n tia l S id e G ear
13. D iffe r e n tia l C a s e -L e ft
H a lf
Fig. 4B-8 Chevrolet 1 2 -1 /4 " Ring Gear Axle—1 1 ,0 0 0 # Capacity
DIFFERENTIAL DIAGNOSIS
is pro per diagnosis o f the
14.
A x le S h a ft
15.
D iffe r e n tia l B e a rin g
16 D iffe r e n tia l B e a rin g
A d ju s tin g N u t
17. A d ju s tin g N u t L o ck
18 D iffe r e n tia l
C a s e -R ig h t H a lf
but, locating and isolating axle noise can be an entirely
different matter.
Degree of Noise
Any gear driven unit, and especially an automotive
drive axle where engine torque multiplication occurs at a
90° turn in the drive line, produces a certain am ount o f
noise. Therefore, an interpretation must be m ade for
each vehicle to determ ine w hether the noise is normal or
if a problem actually exists. A norm al am ount o f noise