The other ideal consideration for steering box placement is having the back end of drag link attach to pitman arm very near the fixed end of leaf spring (not shackle end). This also reduces bump steer because axle and drag link pivot at same point, and follow same arc, so not much differential movement between axle and other end of drag link.

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-