Chevrolet 30 Series 1967 Service Manual page 161

Fig. 8 - Series C30 A u x ilia ry Rear Spring
Series 40, 50 and 60
Series 40, 50 and 60 vehicles use leaf-type springs with
a variable rate of deflection (fig. 10). A straight-ended
main leaf rests against cam surface of the front and rear
hangers, thereby allowing the springs a full fore and aft
float to effect spring length changes. The second or third
leaf has hooked ends which contact rebound pins in the
spring hanger to prevent excessive fore and aft travel in
event of a radius leaf failure.
At the bottom of the spring pile a spacer separates the
last leaf from the control arm (radius leaf), which is a
half-leaf formed with an eye and bushed for attachment to
the front hanger. The spring assembly makes use of a
stress plate below the control arm.
Two slanted "U" bolts attach the spring pile and control
arm to the axle housing.
The optional auxiliary spring pile (fig. 11) is of the
variable rate design sim ilar to the main spring assembly.
Spring attachment is accomplished by the "U" bolt method
whereby both the main and auxiliary springs are secured
to the axle housing as a unit. Separate frame-mounted,
cam-type hangers are utilized to provide a deflection
surface for the auxiliary springs.
REAR SUSPENSION AND DRIVE LINE 4-3
F ig . 10 - Rear Suspension (Series 4 0 , 5 0 , and 60)
CHEVROLET TRUCK SERVICE M ANUAL