Lifted 72 short bed wanders all over the road

[lifted72]

So my pickup is essentially done, except it wanders all over the road. It has new tie rods and tie rod ends, and new u-joints in the steering shaft, so i think its the power steering box. I believe its the saginaw steering box, and it is custom mounted in the frame. It steers extremely easy, so maybe the pitman arm is to long? Thanks for any info you guys might have.

[averagef250]

Check tie rods, wheel bearings, radius arm bushings and get it on an alignment rack to check castor/camber.