Get the instructions from the manufacturers website. One thing to look for is the fit where the ball mount attaches to the new shank, there are shims available if there is too much clearance. Many are installed where the bolts need to crush the ball mount too much, again there may be instructions for that as well.
I upgraded to a 2-1/2" shank, eliminating the adapter, and the reduction in slop made a noticeable difference. The pin bending with an adapter is real and under the right conitions can happen.
