Just a heads up for anyone who runs into this problem...I had the rear end together after page 20 and noticed that the left side drive line was binding...luckily this was not the front so taking it all apart was not bad.
After a lot of playing around with the parts and checking tolerances I found that the rear CVA bone hollow part where the coupler goes in was out of tolerance so it was not letting movement go in one direction because the coupler was binding inside. I had to scrape out inside the hollow bone and cleared it up enough so movement was possible...
This was not the first time I came across parts of this kit that were out of tolerance and caused me to go back and trim things up...

LIP