I have a 1989 GMC Jimmy with a 308 10 bolt rear end. I have located a 1985 3/4 ton Chevy truck with a 456 14 bolt rear end in it. The truck also has front Diff. as well, but is 10 bolt. Will these bolt right up to mine? the numbers on the rear end are: N6969 Any help is greatly appreciated. Thanks in advance.