Id like to give a tip to anyone doing U-joints or replacing drive shafts. I have a 2 piece shaft on my 96 F150 and I after struggling for about an hour trying to get the back shaft mated to the front shaft I realized that the spline on the front shaft has a "groove" in it that must be lined up with the grease fitting on the back shaft. Hope everyone remembers this when they try putting one back together !

Chet

 

Thanks for the tip!