A833 slip yoke problem/driveshaft

Funny , but FWIW when I exploded my 833 I bought another stock A body one , replaced everything and was ready to go but for some reason I was having the same issue. I could only get the slip yoke about an inch into the tail shaft. Drove myself nuts wondering what it was. I spoke to Dan at Brewers , pretty much explained to me there was something hitting internal and open it up and grind it down. I removed the transmission and took it to my local shop and explained the situation. Next day he called me up and said it was exactly as explained. I installed the transmission and the yoke slipped in like butter and has been good since. Not saying that was the issue but just wanted to share my experience if it helps at all.