Re: rear end swap
A 12 bolt from a '71-'72 C10 will be 63.5" wide and have the 5 x 5" wheel stud pattern. Also most will be setup for the trailing arm suspension. A 12 bolt from a '71-'72 K10 should also be 63.5" wide, setup for leaf springs, but the wheel stud pattern will be 6 x 5.5". The '73-'82 C10 12 bolts will also be 53.5" wide and have the 5 x 5" wheel stud pattern, but will be setup for leaf springs.
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