If Chevy trucks have even the slightest downfall worth noting, it's their lack of quality brakes. Although we as enthusiasts consider trucks as the primary vehicle of interest, it seems as though GM does not.
until just recently, no light-duty Chevy truck came from the factory with four-wheel disc brakes. And before 1971, none of the GM truck line had disc brakes at all. This seems even stranger when you consider that trucks are heavy and often times extreme braking power is required to stop, especially when towing a trailer or driving a loaded truck. As consumers began latching onto the older Chevys, the need for improved braking became a reality. If you dump ten grand into a classic truck, you definitely want it to stop on demand.
Prior to 1971 (First Year), all Chevy trucks came equipped with traditional drum brakes, forcing enthusiasts to seek out aftermarket disc brake conversion kits designed to work specifically with older trucks. This lack of factory brake options and performance was the founding force for Classic Performance Products, who have created a power disc brake line for nearly every popular model of Chevy car or truck, as well as most Ford applications, But with a heafty price $1,500 +/-.
http://www.classicperform.com/6092chevtrk.htm When dealing with classic Chevys, more particularly, those from the 60s to the 80s, there more many unique applications which can be applied depending on the truck and the owner's specifications. Power brakes, disc/drum applications and bolt patterns are all elements that play a role in choosing the appropriate kit.
I think...But don't hold me to it,
A set of stock 73-87 chevy 1/2 ton pickup spindles might work for the conversion. Any 73-79 will work, 80-87 must have the 1-1/4" rotors. The 80-87 year spindles come with 1" rotors are 'light duty' and won't work with the 6-lug rotors. I hope the links below help. I'm not a expert just listen to fellas who have done this. If anything you may call CCP and ask for advice.
But I don't know If that will help....
I hope the links below help
http://67-72chevytrucks.com/vboard/s...d.php?t=209956
http://67-72chevytrucks.com/vboard/a...php/t-866.html
http://67-72chevytrucks.com/vboard/s....php?p=2652815