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Rear Brake Backing Plate

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Old 05-19-2020, 12:20 AM
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Default Rear Brake Backing Plate

Guys, I know it's going to be a used part only at this point but I'm in need for a rear brake backing plate for the driver's side of a 2005 GXP. Question is do all of the LS4 cars use the same one or is the GXP one GXP specific? I know the Grand Prix 3800 cars are different so no joy there. Just need to know exactly what my options are.
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Old 05-21-2020, 09:56 AM
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I could be wrong but I think the GXP rotors are different, rear are about 12 inches and fronts are 12.7. I think the other LS4 cars use smaller rotors. I would think the rotor size would determine the backing plate. Post back your findings. Thanks
Old 05-28-2020, 09:34 PM
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After checking around I think the real difference is the parking brake assembly and not the rotor size. The GXP uses a drum style parking brake which is mounted to the backing plate while I believe the other LS4 cars uses the caliper as the parking brake.



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