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Re: convert a 1971 c30 dually into a srw front
A a side note, for 72 and earlier, both 3/4 and 1 ton used a 1.25" thick rotor with 2 9/16" dia. caliper pistons. Starting in 73, the 1 tons could come ordered with the JB8 (or JD8) option - which got you a 1.50" thick rotor and 3 1/16" dia. piston calipers. On these larger JB8 1 ton brakes, the spindle was different only because these thicker rotors used the heavy duty "wedge" style calipers, rather than the "2 pin" style calipers found on the 3/4 and 1/2 ton vehicles. You could swap out the DRW ("dually") rotors on these and swap in a SRW JB8 (1.50" thick) rotor, and everything else was the same - the difference was solely in the depth of the DRW rotor. I only mention this because some people want the larger 70-80's JB8 brakes in a SRW package in their earlier 67-72 3/4 & 1 ton trucks, and also give more options if you're hunting down parts. The lower control arm and ball joint for the 3/4 and 1 tons are different from the 1/2 ton for these years (73-87).
Ill leave it to the experts above on the swap'ability of strictly 67-72 brake parts b/n C20 - C30.
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