WranglerGM

I had a shop install a B and M Hammer Shifter in a Jeep Wrangler TJ equipped with a 5.3 Vortec engine and a 4L60e transmission. Now, to pull the shifter out of P is a pain in the neck. I have to pull so hard that most of the times it goes directly in D. I open the cover and all I see is a lot of levers; I read the instructions but I don’t understand what to do in order to make it shift smooth. I eased a flat spring (like a leaf spring with a tooth at the end) that is on the top visible, and now it shifts in an easier way between R and N and D, but to get it out of P is still a pain. Any suggestion? (beside that the shop that installed it sucks…) Thank you, Paul.