Performance Online now offers you the option of upgrading the rear of your 1971-87 Chevy, GMC truck to disc brakes and match the front. These kits are available in 5 x 5" bolt pattern and come standard with GM ratcheting calipers. This kit can also be used on 1963-70 trucks that are converting to the popular 5-lug bolt pattern. These kits will improve 60 to 0 foot stopping times and increase driver feedback.