is your rear axle a Eaton or Dana , i found myself forsale a 1967 c30 the rear axle most likey 514 so im going to put in 457 or 411 when i get the truck , if you have Eaton 457 or 411 if you have a Dana 456 or 410 , im not sure about 373 , no one wants 617 538 514 of Eaton 513 of Dana , in the mid late 70s when they came out with the 14 bolt rear axle and still made the Dana but stop making the Eaton , i am Allen im in FL for now
