When I replaced the front suspension on the wife's '06 Trailblazer in early June, I set the lower control arm brackets in their frame pockets as far to the rear (towards the tailgate) as I could and still get the bolts in easily. As regarding the side-to side placement, which will set the camber, I put them in so that at a point about 3" (I'm going from my aging memory on this distance, it may have been a bit more) from the front of the pocket the bracket was flush with the edge of the frame pocket. I used a small metal straight edge to get it flush. At a point about 3" from the rear of the pocket I set the bracket into the pocket about 1/16" deeper than the edge of the pocket, so that in effect the rear of the bracket sits about 1/16" farther inboard than the front edge does. I hope that makes sense. I just set the toe-in by eye because I just needed it to get close enough to be able to drive it to the tire shop a few miles away for a professional alignment. How close did I get it? I nailed the camber on both sides, and nailed the caster on the drivers side. They didn't even touch that bracket. On the passengers side the caster was off by just a hair. The toe was off, but I figured it would be.
I hope this helps you get it close enough to get it to the shop for an alignment!
Yea, they are a tight fit! I had to use a 3lb. sledge hammer and a pry bar to move them! To measure them, use a small metal straight edge and just put it vertically on the edge of the pocket, noting where the edge of the bracket is in relation to the straight edge. They do need to be pretty much toward the back of the vehicle as far as you can get them. Use your finger and reach up in there to make sure the bolt has a good path into the hole, though. (That doesn't sound right, somehow...)
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