brake prop. valve

[piratedog]

am doing a drum to disc swap on my 70 gmc 1/2 t. and am wondering what proportioning valve i can grab at the wreckers( models,years) on next visit,,am keeping drums on back.

thanks in advance

[michael bustamante]

Youll need to pull one from a 71-72 with disc brakes. The hardlines wont fit though so youll have to replace those as well as the soft hoses in the calipers.
I know you can use one from a 73+ truck also but they sit on the crossmember.