85 C-10 and Long arm rear suspension

[lo72]

Looking to replace the rear leaf suspension with 67-72 long arm suspension using some Porterbuilt parts. Will be piecing it together not able to buy the whole setup. Question does anyone know if the long arm crossmember can be installed without removing the cab? Will b bagged front and rear. Any input would be great. So bags on the arms or on the axle, behind the axle, in front of the axle inside the frame or outside the frame? Dominators or rolling sleeve bags? Thanks for the input. Greg
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