control arm cross shaft question

[greasy68]

I have a 68 1/2 ton 2wd. I am replacing the upper and lower control arm cross shafts. I bought new ones and got the shafts installed in the control arms. After mounting them on the frame the cross shafts didn't appear to be certered. I pulled them off and spun the shaft on the lowers and got them close. I tried the same on the uppers but they seem to be binding after about 2 turns and are still not cetered. Is there a procedure to install and center these? Should they spin freely? My Haynes manual doesn't say anything and my searches on here haven't given me much. Thanks for your help.