Nathan, (GasGuzzler) im sure could help you out
Only 2500+ trucks 05+ have discs on the back. This does not count utilities that are all disc. Not worth the effort although the discs are much better IMO. I'm not considering specialty models BTW.
there are companies that buy surplus parts from axle mfg companies and sell them for about $500 complete. I think Cowl327 or Txarkitkt knew of a place in DFW to get them.
See my truck data in the "My Garage" section here... http://www.ls1truck.com/forums/my-ga...tml#post191709
you can buy weld on brackets for the calipers for under 90bucks. and you can bolt on calipers and rotors on the back. Use a search on ebay and you should find some.
Rob--There are brackets (as stated above) where you can adapt the trucks for rear discs. Just grab a set from the salvage yard from a How Or Sub and you're in business. It sounds like you are on the right track as far as things go, so yes--the proportioning valve is definitely required.
P.S. You have a Private Message.
2000 ECSB 6.0L
TORQUER V2 CAM ● COMP 918's ● 7.4 HARDENED PUSHRODS ● K&N SERIES 77 CAI ● 80mm BBK ●PACESETTER LT HEADERS AND 3'' ORY ● SUPER 40 FLOW ● 3000 STALL ● 4.10s ● BUILT 80e ● VORTEC PERFORMANCE TUNE ● MSD 8.5mm PLUG WIRES● ELEC. CUTOUT ● UD & ALT PULLEYS ● FLEX-A-LITE E-FANS ● 22" CENTERLINE STINGRAY III's ● LUND FIBERGLASS TONNEAU ● 2" LEVELING SHACKLES ● 12K HID LOWS & FOGS ● LEDs ● DEBADGED ● WHITE-FACED ESCALADE GAUGES ● KICKER 450.1 ● 2-CVR 10's ● DS60's ● K693's