front suspension challange

[kglowacky]

I finished my truck and start driving it. put 50 miles on it and way to much slop in the steering. New rebuilt steering box. When I turn the wheel back and forth it appeared to be in the box. also I noticed when I turned the wheel back and forth the frame horns flexed back and forth. Is this common? Took the box off and took it back to the rebuilder, He fixed it said cracked cover and worn main gear. Had a major issue removing the box as I could not get the pitman arm loose from the solid cross bar, Had to remove it all as one unite and disconnect the thing with great force on the bench. Now I am trying to re install everything I cant get the tie rod and crossbar assembly connected as one piece do to a clearance problem with the lower control arm and the pitman arm. Is this common and do I need to re assemble piece by piece? Next I bought this truck in pieces and the previous owner gave me the parts from this truck 78 c01 and a 80,s something Suburban. I am perplexed on what my problem is.
Is it the rebuilt box and now I am good to go.
Or do I have a binding issue as one of my parts is off a suburban and creating the bind.
I will say when I bought all my new tie rod ends and other suspension parts they were all for a c10 but the idle arm I had to go with a 86 suburban to match my crossbar, So if the crossbar is different on a suburban there may be my problem. Sorry for the long email I just wanted to give you all the background. Your thoughts,