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I agree with tx firefighter on brake proportioning valve, as long as its a disc brake proportioning valve you should be ok. After checking over 30 different parts catologs it doesnt seem to matter if 1/2 or 3/4 ton and 1971 and 1972 are the same. My used disc brake set up had the proportioning valve with it (3/4 ton). My 1/2 ton parts doner truck appears to have the same proportioning valve on it.
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