I looked into it with my truck since I was wanting to do a solid axle swap and use an old 205 ior 208 t-case, best I can come up with is a thing sold by jagsthatrun, it's like a pulse generator or something, supposed to be for tbi and make a cable unit operate and generate a pulse for use with vss and it's like $70 on their site.
painless and somebody else had something similar but told me none would work due to tbi and vss, but the jagsthatrun says it's for the tbi so it should work. I have yet to try it though.
I also thought I heard tale of swapping the 700r4 tailshaft onto a th350?