I found this good deal on a posi unit from an 94 impala, and I know that there has been talk about being able to swap units from impala's into a 8.5 10 bolt rear end from the C10. I don't know what years from but my question is, if it will fit into a 1984 chevy C10 with the 5X5 axles and do they come with 31 splines as same as the impalas?