Object Alpha issue.

[Captain Cody]

So I'm attempting to make a custom wheel system, with much success, but the issue I am having is that when trying to mix two wheels (Setting one tread invisible and what not) this happens..

And I'm using this for the FX file

//  Texture replace and transform 
  
//#include "mta-helper.fx" 
float4x4 gWorld : WORLD; 
float4x4 gView  : VIEW; 
float4x4 gProjection  : PROJECTION; 
float gTime : TIME; 
  
texture gTexture; 
float gHScale = 1.0; 
float gVScale = 1.0; 
float gHOffset = 0.0; 
float gVOffset = 0.0; 
float gBrighten = 0; 
float gRotAngle = 0;   
float gGrayScale = 0; 
float gRedColor = 0; 
float gGrnColor = 0; 
float gBluColor = 0; 
float gAlpha = 0; 
float gScrRig = 0; 
float gScrDow= 0; 
  
sampler2D gTextureSampler = sampler_state 
{ 
    Texture = ( gTexture ); 
    MinFilter = Linear; 
    MagFilter = Linear; 
    AddressU = Wrap; 
    AddressV = Wrap; 
}; 
  
struct VertexShaderInput 
{ 
    float4 Position : POSITION0; 
    float2 TextureCoordinate : TEXCOORD0; 
}; 
  
struct PixelShaderInput 
{ 
    float4 Position : POSITION0; 
    float2 TextureCoordinate : TEXCOORD0; 
}; 
  
PixelShaderInput VertexShaderFunction ( VertexShaderInput input ) 
{ 
    PixelShaderInput output; 
     
    float4 worldPosition = mul ( input.Position, gWorld ); 
    float4 viewPosition  = mul ( worldPosition, gView ); 
    output.Position      = mul ( viewPosition, gProjection ); 
     
    output.TextureCoordinate = input.TextureCoordinate; 
    return output; 
} 
  
float4 PixelShaderFunction ( PixelShaderInput output ) : COLOR0 
{ 
    float2 textureCoordinate = output.TextureCoordinate; 
  
    textureCoordinate[0] *= -0.2; 
    textureCoordinate[1] *= 0.4; 
  
    textureCoordinate[0] += -0.2; 
    textureCoordinate[1] += 0.4; 
     
    textureCoordinate[0] *= gHScale; 
    textureCoordinate[1] *= gVScale; 
     
    textureCoordinate[0] += gHOffset; 
    textureCoordinate[1] += gVOffset; 
    if(gScrRig!=0)  
    {  
        float posU = fmod( gTime*gScrRig ,1 );    
        textureCoordinate[0] -= posU; 
    } 
    if(gScrDow!=0)  
    {               
            float posV = fmod( gTime*gScrDow ,1 );      
        textureCoordinate[1] -= posV; 
    } 
     
    float4 textureColor = tex2D ( gTextureSampler, textureCoordinate ); 
     
        if(gRotAngle!=0) 
    { 
        float x = (textureCoordinate[0] * cos(gRotAngle)) + (textureCoordinate[1] * -sin(gRotAngle)); 
            float y = (textureCoordinate[0] * sin(gRotAngle)) + (textureCoordinate[1] * cos(gRotAngle));                 
        textureColor = tex2D ( gTextureSampler, float2(x,y)); 
    } 
  
    if(gGrayScale!=0) 
    { 
    float averg=(textureColor.r + textureColor.g + textureColor.b)/3.0; 
    textureColor=averg; 
    } 
  
        textureColor.r=textureColor.r+gRedColor; 
    textureColor.g=textureColor.g+gGrnColor; 
    textureColor.b=textureColor.b+gBluColor; 
     
    textureColor = textureColor+gBrighten; 
    textureColor.a = gAlpha; 
    return textureColor; 
       
} 
  
technique Replace 
{ 
    pass P0 
    { 
        AlphaBlendEnable = TRUE; 
        SrcBlend = SRCALPHA; 
        DestBlend = INVSRCALPHA; 
        VertexShader = compile vs_1_1 VertexShaderFunction ( ); 
        PixelShader  = compile ps_2_0 PixelShaderFunction  ( ); 
    } 
} 

[Captain Cody]

Enabled alpha transparancy and have this issue