Possible Cause - Chevrolet Chevelle 1977 Repair Manual

Complaint
Does n o t lo c k :
Locks in tu rn s :
N oisy:
N O T E : In a d d itio n to n o rm a l axle noise (see se ctio n on standard d iffe re n tia l) , th e lo c k in g d iffe re n tia l e x h ib its some
c lu tc h noise u p o n engagem ent and disengagem ent.
* R e action blo cks m ust be replaced w ith blo cks o f id e n tica l thickness.
REAR AXLE DIFFERENTIAL
DIFFERENTIAL DIAGNOSIS

Possible Cause

A. L ittle or no spring
p re lo a d on th e la tch in g
b ra cke t.
B. F ly w e ig h ts on g o vernor
assembly s tu c k closed.
C. B ro ke n D rive te e th on
g o ve rn o r a n d /o r cam
gear assem bly.
D. B ro ke n c lu tc h plates
in cam gear assem bly.
A. G o ve rn o r assembly
tig h t in case.
B. B ro ke n o r w eak
g o vernor fly w e ig h t
spring.
C. F ly w e ig h t in g o ve rn o r
assembly s tu c k open.
D. B ro ke n cam p late a n d /o r
g o vernor drive te e th .
A. B ro ke n c lu tc h plates.
B. B ro ke n re a ctio n b lo c k .
C. B ro ke n d iffe re n tia l
gears.
Fig. 4B-3H~Diagnosis Chart
Correction
A . Replace g o ve rn o r assem bly
and la tch in g b ra cke t.
B.
Replace g o ve rn o r assem bly and
la tc h in g b ra cke t.
C. Replace cam p la te , g o ve rn o r
assem bly and la tc h in g b ra c k e t.
D. Replace c lu tc h plates and
wave spring.
A .
Free up g o ve rn o r assem bly.
B.
Replace g o ve rn o r assem bly
and la tc h in g b ra cke t.
C. Replace g o ve rn o r assem bly
and la tc h in g b ra cke t.
D.
Replace cam p la te , g o ve rn o r
assem bly and la tc h in g b ra cke t.
A .
Replace c lu tc h plates and
wave spring.
B.
Replace re a ctio n b lo c k .* C heck
clo se ly fo r o th e r damage.
Replace e n tire u n it if
h ousing, side gear, o r p in io n
gears are damaged.
C.
Replace e n tire u n it.
4B-75