I've read about the shackle flip and decription on the site. I'm still a little confused on why to use it. My 1978 project is just that a "project". It's basically road ready but it's going to be right or not at all. It's got a 4" lift with the blocks in the back. With the flip I can lose the blocks correct? Since I haven't driven this particular truck yet what will be the difference in certain situations ie: 4 wheelin, general hwy driving, towing a boat.... what about pinion angle will that change as well.... Just a few questions..... The only full size blazer I've driven was an '89 and I don't remember too much about it other than it liked to drift down the road and it bucked due to the short wheel base (I guess)..... Blood, sweat, tears, and lots of money is what keeps the k5 alive.