I have a 2000 chevy 2500 I bought. The front drive shaft was not in it when I bought it but came with it (new u-joint installed). I cannot get the dang splined shaft to slide in all the way. Everything is perfectly clean. I have used a lot of grease and I have used very little grease. I have tried other lubricants too. The opening in the t-case is 6" deep. I can only get it 3.5'' at best. I have tried beating on the yoke to get it in further and it won't budge.