Thrust Angle
![A bad thrust angle results in a crooked steering wheel.](graphics/steering-wheel-1.jpg)
A vehicle's thrust angle affects its steering wheel position. The thrust line should line up with the vehicle's geometric centerline. Check this angle if the vehicle has been in a collision. There is a difference in repair procedures depending on the vehicle's suspension system.
![Thrust Angle](graphics/thrust-angle.png)
Axle offset occurs when a solid axle is crooked and not square with the front tires. Perform a thrust angle alignment on a vehicle with a solid axle. Independent suspensions are adjustable and require rear toe link adjustments to correct an incorrect thrust angle.
![Wheel alignment machine.](graphics/alignment-screen.jpg)
Since front-wheel-drive cars are more prominent than rear-wheel-drive, four-wheel alignments have become the norm. The thrust angle must be checked and corrected before the wheel alignment. Inspect the vehicle for collision damage and rear toe.
![The parts of a rear leaf spring.](graphics/leaf-spring.png)
Axle offset occurs when the rear axle tilts sideways, causing both rear tires to point in the wrong direction. Like a forklift, the vehicle will steer to the right if the rear tires point to the left. A broken leaf spring center bolt or problems with the shackle typically result in axle offset.
![Leading and trailing axle control arms.](graphics/rear-axle-control-arms.png)
On vehicles with trailing arm suspension, worn or damaged bushings or a bent arm can cause a noticeable pull in the steering wheel.