the pill is a inch and a half long pill looking thing, it sits between the shift rails in the rear section of the rear main case. When a stock shifter is installed, you have to shift into 4wd before you have access to the low 2.28 gears. When you install twin sticks, you have to remove this pill, to remove it you have to open up the cases. Check out a twin stick install guide, i'm sure it in there.
when i put my cases together, i also installed a triple stick set up. Which is essentially a relocated twin stick. I forgot to remove the pill, and finally noticed right before I was going to install the cases in the truck; I tried to test shift everything, and the 4wd stick was stuck. After much deliberation and an hour so I decided I had to tear the cases back apart and inspect my work. Finding I didn't follow the directions totally correctly. After removing the pill and a little adjusting everything worked great and I love my Marlin dual cases and my Davez tripple stick set up.
