Car won't stop doing wheelies

So I imported the vehicles standard asset and then I removed the graphical part. I replaced that part with a different car body and 4 wheels. Then I adjusted the colliders to fit the car and changed up the wheel hub colliders.



The problem is that the car rears up on its back wheels when I press play.



It is hitting the back collider so it stops there. Although when I am in play mode and I bring the back wheel colliders up into the car it falls down and works correctly as if it has no back wheels.



Does anyone know how to fix this?