thisguyuknow

This may sound like a dumb question.. I know the input shaft on the tcs for 12 and up changed making it incompatible with earlier autos and manual trans... Is that the only difference? I only ask because I have had one sitting on my shelf for a long time and I cant get rid of it. I am wondering if I can swap the input shaft from an earlier jk or if I am,just stuck using it with a 12 or higher auto project.