Another Differential Question

[PbFut]

I have little experience with solid rear ends. All the rear end experience I have is IRS. So nothing with axil hubs. My 72 as best I can figure is a peg leg 3.50. But I am not sure of that ratio. It does not have a round case so that tells me Dana. My searches come up with bits and pieces, but I am not finding a really good definative source for a 72 setup. A new Blue Print 400 is on its way. Tranny in for rebuild. I figure I may as well complete the Trio and swap the pegleg for a posi. With the horse power of the engine, that 3.08 gear set in the for sale section is tempting. Input and if you know of a good link for set of steps to disassemble it would be appreciated. Thanks all.