Scripted tank track bones behave strange

Rigged and scripted Tank track mesh and bones behave strange when tank rotating. Actually bones are problem.I'm using existing script i found on internet and slightly edited it. I'm 3D designer but i'm doing my best with little time i can spare to be better at scripting but these are moments where i just stuck. As more as i rotate whole tank,more they "skew". :/ Setup of wheels is basically standard what we will expect,Unity wheels component,meshes following wheels component y position and bones following wheels meshes position. Since game is for mobile i reduced number of wheels which leaves gap in between wheels which gives trouble on short tall obstacles where track mesh will cut into this obstacle so to avoid that i added wheels there also just to support realistic obstacle crossing.I have track and bones following perfectly wheel meshes on y position but everything else is not so great.Basically i have few players playing my old wartank game from one year ago and i appreciate them so i'm truing to give them nice update. Scene setup and code is real mess and i will highly appreciate if someone have will to help me. Tanktrack video from my fb profile < you can see it on video. Here are some images

Here is script:

 #pragma strict
 import UnityEngine;
 import System.Collections;
 
 public var wheelcolliders :WheelCollider[] = new WheelCollider[10];
 public var WheelMeshTransform :Transform[] = new Transform[10];
 var MaximumTorque : float;
 var leftInput : float;
 var rightInput : float;
 var Brakes : float;
 public var pos : Vector3;
 public var quar : Quaternion;
 
 public var Lbone2 : Transform;
 public var Lbone3 : Transform;
 public var Lbone4 : Transform;
 public var Rbone2 : Transform;
 public var Rbone3 : Transform;
 public var Rbone4 : Transform;
 
 public var LhalfBone_a : Transform;
 public var LhalfBone_b : Transform;
 public var LhalfWheelCol_a : WheelCollider;
 public var LhalfWheelCol_b : WheelCollider;
 
 function Start () {
 
 }
 
 function Update () {
 MaximumTorque = 100;
 leftInput = 0;
 rightInput = 0;
 Brakes = 0;
 
 
         if(Input.GetKey(KeyCode.LeftShift) == true){
            leftInput = 1f;
         }
         if(Input.GetKey(KeyCode.LeftControl) == true){
            leftInput = -1f;
         }        
         if(Input.GetKey(KeyCode.RightShift) == true){
            rightInput = 1f;
         }
         if(Input.GetKey(KeyCode.RightControl) == true){
            rightInput = -1f;
         }
         if (Input.GetKey(KeyCode.Space) == true){
             Brakes = 300;
         }
         if(Input.GetKey(KeyCode.LeftShift) == true && Input.GetKey(KeyCode.RightControl) == true){
         MaximumTorque = 150;
         }
         if(Input.GetKey(KeyCode.RightShift) == true && Input.GetKey(KeyCode.LeftControl) == true){
         MaximumTorque = 150;
         }
         
         //Left tread
         wheelcolliders[0].motorTorque = MaximumTorque * leftInput;
         wheelcolliders[1].motorTorque = MaximumTorque * leftInput;
         wheelcolliders[3].motorTorque = MaximumTorque * leftInput;
         wheelcolliders[4].motorTorque = MaximumTorque * leftInput;
         wheelcolliders[5].motorTorque = MaximumTorque * rightInput;
         //Right tread
         wheelcolliders[6].motorTorque = MaximumTorque * rightInput;
         wheelcolliders[7].motorTorque = MaximumTorque * rightInput;
         wheelcolliders[8].motorTorque = MaximumTorque * rightInput;
         wheelcolliders[9].motorTorque = MaximumTorque * rightInput;
         //Meshes Left
         wheelcolliders[1].GetWorldPose(pos,quar);
         WheelMeshTransform[1].position.y = pos.y;
         WheelMeshTransform[1].rotation = quar;
         WheelMeshTransform[1].position.z = pos.z; //fixing wheel position error
         WheelMeshTransform[1].position.x = pos.x; //fixing wheel position error
         
         wheelcolliders[2].GetWorldPose(pos,quar);
         WheelMeshTransform[2].position.y = pos.y;
         WheelMeshTransform[2].rotation = quar;
         WheelMeshTransform[2].position.z = pos.z; //fixing wheel position error
         WheelMeshTransform[2].position.x = pos.x; //fixing wheel position error
         
         wheelcolliders[3].GetWorldPose(pos,quar);
         WheelMeshTransform[3].position.y = pos.y;
         WheelMeshTransform[3].rotation = quar;
         WheelMeshTransform[3].position.z = pos.z; //fixing wheel position error
         WheelMeshTransform[3].position.x = pos.x; //fixing wheel position error
         //faking left wheel rotation
         WheelMeshTransform[4].rotation = WheelMeshTransform[1].rotation;
         WheelMeshTransform[0].rotation = WheelMeshTransform[1].rotation;
         //Half colliders_bones left
         LhalfWheelCol_a.GetWorldPose(pos,quar);
         LhalfBone_a.position.y = pos.y-0.13;
         LhalfWheelCol_b.GetWorldPose(pos,quar);
         LhalfBone_b.position.y = pos.y-0.13;
 
 
         //Meshes Right
         wheelcolliders[6].GetWorldPose(pos,quar);
         WheelMeshTransform[6].position = pos;
         WheelMeshTransform[6].rotation = quar;
         wheelcolliders[7].GetWorldPose(pos,quar);
         WheelMeshTransform[7].position = pos;
         WheelMeshTransform[7].rotation = quar;
         wheelcolliders[8].GetWorldPose(pos,quar);
         WheelMeshTransform[8].position = pos;
         WheelMeshTransform[8].rotation = quar;
         //faking right wheel rotation
         WheelMeshTransform[5].rotation = WheelMeshTransform[8].rotation;
         WheelMeshTransform[9].rotation = WheelMeshTransform[8].rotation;
         
         //Bones left
         Lbone2.position.y = WheelMeshTransform[1].position.y-0.2;
         Lbone2.position.x = WheelMeshTransform[1].position.x;
         Lbone3.position.y = WheelMeshTransform[2].position.y-0.2;
         Lbone3.position.x = WheelMeshTransform[2].position.x; //empty boneFixer.x
         Lbone4.position.y = WheelMeshTransform[3].position.y-0.2;
         Lbone4.position.x = WheelMeshTransform[3].position.x;
         
         
         //Bones right 
         Rbone2.position.y = WheelMeshTransform[6].position.y-0.2;
         Rbone3.position.y = WheelMeshTransform[7].position.y-0.2;
         Rbone4.position.y = WheelMeshTransform[8].position.y-0.2;
 
 
         for(var WC:WheelCollider in wheelcolliders)
         {
             WC.brakeTorque = Brakes;
         }
 
 
 }