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This photo shows an '87 GTA rear end with disc brakes. These are the smaller pre-'89 10.5-inch iron caliper units, but they're mounted on a 3.27 limited-slip 9-bolt. If you're working with a 3.08 or higher open differential, you'll see a substantial performance increase from this swap. The '89-and-later disc cars were upgraded to the better 1LE rear brakes. Also pictured are the rear WS6 springs. Drop the shock mounts and they virtually fall into your hands.