Noob question, I got under my 2000 sport 4.0 5-speed (51000 miles) to check things out and see if everything was tight. The only thing I found not tight was my front drive shaft. It has about 1/4" play in both the shaft and yolk. U-joints look good and tight. I tried in 2H, 4H, and 4L......nothing changed. 1/4" play in all settings. Is this normal?......or do I have something going wrong.