Transforming a moving 3D Object is altering the direction

I am creating a Braitenberg simulation and am trying to implement a screen wrap function. My vehicles are cubes with cylinders attached with hinge joints to create wheels, the back wheels are powered by a motor to produce movement that varies depending on environmental factors.

My issue is that when I transform my vehicle components on collision with a wall, the vehicle jerks and changes direction of movement after transforming. See image below.

http://imgur.com/a/PfpUE

I am currently using this code to transform the body and wheels of the vehicle within my vehicleController script, I feel the issue may be that i am transforming them individually but I do not know how else to do it as the vehicle parent transform does not hold the current position.

 Vector3 flip = transforms[1].position;
             Debug.Log(flip);
             flip.z = -(flip.z);
             Debug.Log(flip);
             transforms[1].position = flip;
             
             for(int i = 4; i < 8; i++)
             {
                 flip = transforms[i].position;
                 flip.z = -(flip.z);
                 transforms[i].position = flip;
             }

With transform[1] being the body and transform[4-7] being the wheels.

Thanks