Static Unbalance Correction; Dynamic Unbalance Correction; Standard Axle - Pontiac TRANS AM 1977 Service Manual

WHEELS AND TIRES 3 E-5
'
CL
OF SPINDLE
ADD BALANCE
WEIGHTS HERE
I
SPOT
WHEEL TRAMP CORRECTIVE WEIGHTS
4660
Fig. 3E-6 Static Unbalance Correction
I
I
WEIGHTS HERE
I
ADD BALANCE
- - --
CL OF SPINDLE
HEAVYSPOT
I
I
WHEEL SHIMMY CORRECTIVE WEIGHTS
4659
Fig. 3E-7 Dynamic Unbalance Correction
by hand. If the wheel can be turned, it is a standard axle; if
the wheel cannot be turned, it is an anti-spin differential.
Standard Axle
On vehicles equipped with standard axle, raise rear of
vehicle with floor jack under differential. This must be done
to allow car to vibrate while balancing. Place a block under
the opposing wheel and let vehicle down so opposing wheel
sits on block and the wheel t o be balanced is at least two
inches off the ground (Fig. 3E-8). This is to allow only one
wheel to spin. Proceed with balance using engine power to
spin the wheel.
WARNING: ON CARS WHICH DO NOT
HAVE ANTI-SPIN DIFFERENTIAL, DRIVE
WHEEL SPIN SHOULD BE LIMITED TO
35 M P H AS INDICATED ON THE
SPEEDOMETER. THlS LIMIT IS
NECESSARY BECAUSE THE
SPEEDOMETER ONLY INDICATES ONE-
HALF OF THE ACTUAL WHEEL SPEED
WHEN ONE DRIVE WHEEL IS SPINNING
AND THE OTHER DRIVE WHEEL IS
STOPPED. UNLESS CARE IS TAKEN I N
LIMITING DRIVE WHEEL SPIN, THE
SPINNING WHEEL CAN REACH
EXCESSIVE SPEEDS. THlS CAN RESULT
I N POSSIBLE TIRE DISINTEGRATION OR
DIFFERENTIAL FAILURE, WHICH COULD
CAUSE SERIOUS PERSONAL INJURY
OR EXTENSIVE CAR DAMAGE.