seems I'm answering my own question... turns out my 84 4x4 Jimmy with a 6.2 diesel and 700r4 trans runs the same 3.07 gear ratio as my 83 Sierra Classic 4x4 pick up with a 305 gas and 700r4 trans.
Assuming yours to be automatic, it would have a 700R4 transmission.
700r4
a 700r4 trans out of a s10 with a 4.3 will bolt up to a 305 but you will have to use flywheel cover for the s10 trans.
Yes unless the 700r4 came behind a 2.8
700R4
700r4
Dex II
YES.
if its a 4.3 its a 700r4
Yes
no
Yes you can, But the driveshaft won't be long enough.