I have a 76 K10 with a 4" lift.As some of you know, when I went to bolt the rear drive shaft back up I noticed the splines were sticking out of the slip yoke a bit. I still have about 2" of spline inside the yoke. I noticed a little play when I push the shaft up and down. When I twist it, it is tight. Do you guys think this is anything to be worried about?