yj springs are about 6" longer than sammy springs and will stick out further in the front hindering your approach angles. The mounting kit for the toyota axles is available for both yj or sammy springs but if you want to mount yj springs on your tracker front end you will have to build your own mounts out in front of the bumper. I think they stick out too far and when you add the shackles, there is a real loss of clearance and approach. I am running Trail Gear rear sammy springs with 3" of lift for my front swap and they are working good.