1982 standard transmission into 1970 auto 4X4

[stingray_]

I have a 1970 GMC 1/2 ton that is automatic, and has a 350 motor and TH350 transmission. It is a 4X4.

I also have a 1982 GMC 3/4 ton truck that is 2 wheel drive. The '82 is a three speed with granny (Low) gear.

Is there a way to adapt the standard transmission from the '82 into the '70?

1.) If this is possible, who makes adapters or what is the process? I know I will need pedals, the bell housing for the small block and driveshaft lengths may need to be changed. etc.

2.) Would there be any gear ratio problems?

3.) Are there better standard transmissions for this? What is the ideal standard transmission for this sort of application?

4.) Is this a good idea? opinions?

Thank you,
Ray