Rear end alignment

[Starter986]

I was watching a youtube vid... transmission removal (I was bored. Will not be removing my transmission).

As the fellow was removing the 2 bars and the metal plate, under the transmission, he mentioned that removal of the bars, and particularly because of the bolts (not nuts) at each end of those bars (closest to the under the back of each door) that an alignment would be necessary once everything was buttoned back up. He mentioned that thse 2 bolts are associated with the rear alignment adjustment.

Is this correct? I'll be doing the transmission fluid drain... new filter... clean pan... etc... and would like to know if when completed I'll have to take it in for a rear end alignment. What would be a ballpark price on that task? Should I consider a 4 wheel alignment?

Thank you.