Turbo Action 17156 on a mild 340 street Duster?. Help

Lba not lrb..oops
I was going to do the same thing in my 340 Duster,. But had the same question (s). And one question would bring another.... Then, lifeand things got in the way, and.... I never figured it out, even though it was explained several times! To the best of my limited knowledge on the subject, You Do NOT Want to be hooked up when hitting 2nd gear,. W/o a sprag......I still get corn- fused as to what the deal is, in all actuality... Sorry to interrupt without Pure facts!