Seems like all I do is ask ??'s but since my 72 is a daily driver and gas prices seem to want to go up, it would make sense to have a 4sp auto with OD -- which from what I understand is a 700r4, correct? Can I replace my 350 with an 700r4 there are a couple on the parts boards. Is this a major undertaking? will it mate up with my NP205? No one ever did confirm my guess on my t-case pics....My truck has a B&M shift kit in it now, but it has L1, L2 and D markings on it.