Grand Prix V6-3.8L SC VIN 1 (1997)
Toe-in is the turning-in of the wheels, while toe-out is the turning-out of the wheels from the geometric centerline/thrust line. The purpose of toe is to
ensure parallel rolling of the wheels. Also, toe serves to offset the small deflections of the wheel support system which occur when the vehicle is rolling
forward. Even when the wheels are set to toe-in or toe-out, they tend to roll parallel on the road when the vehicle is moving.
Thrust Angle
The front wheels aim or steer the vehicle, but the rear wheels control tracking. This tracking action is related to thrust angle. Thrust angle is defined as
the path that the rear wheels will take. Ideally, the thrust angle would be geometrically aligned with the body centerline.
Lead
Lead is the deviation of the vehicle from a straight path on a level road, without hand pressure on the steering wheel.
Lead is usually caused by:
^ Tire construction.
^ Uneven brake adjustment.
^ Wheel alignment.
The way in which a tire is built can produce lead. Rear tires will not cause lead.
Memory Steer
Memory steer is a condition encountered when after making a turn in one direction, the vehicle will want to lead or pull in that direction. After fuming in
the other direction, the vehicle will want to lead or pull in that direction.
Setback
