You may have put the upper control arms on backwards. IE. rhs on lhs and vice-versa. I did this once on a rebuild and shop had the same problem. Fortunately, there was a C-10 just around the corner that we could check. DOH! 
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1968 C-10 SWB, 5.7 Vortec/700R4/3.73 posi, Torch Red
1968 Camaro, 250/Powerglide, all original (No, I'm not gonna drop a 350 in it!...Jeez!)
2000 Honda VFR in the faster yellow!
2008 Husqvarna TE-610
1967 C-10 SWB 'Six Appeal'-Gone but not forgotten...
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