CharliesTheMan
Gone - bye bye.
The instructions have a lil excerpt at each place where there is an option part involved. Like when you assemble the axles, the instructions have a lil section to the side showing how to install the heavy duty ring and pinion if you have it, but the regular comes stock, same with the links and all the other hop ups. Don't sweat it though, I got my kit before the bent links, so I uilt it with the stock links, and then when I got the bent links I had them swapped in about 5 minutes.