I have a 2006 chevy silverado 1500 crew cab with brake shoes on the rear. I believe it's a gu5. My question is: Can I swap it with a 2007 gu6 with disc brake? I can find a gu6 with disc brakes for $220.00 The brake conversion kit is $480.00 and up. I'm not liking those kits. Any help is appreciated. Thank you.