Here are pictures of Delphi(Saginaw) power steering on my 55.2, two ton truck, hub cover held on with 6 bolts. I bolted on disc brake spindles from a P-3500 HD which is a separate issue, but the arms, etc. have the same geometry. Various GM boxes are suitable, pitman arm may be reclocked by removing skip splines in arm with small 3 cornered file. Important to box inside of frame with spacers for bolts to prevent crushing frame.
Ed
'37 GMC T-18 w/ DD 4-53T, RTO-610, 6231 aux., '95 GMC running gear, full disc brakes, power steering, 22.5 wheels and tires. '47 GMC 1 ton w/ 302, NP-540, 4wd, full width Blazer front axle. '54 GMC 630 w/ 503 gasser, 5 speed, ex fire truck, shortened WB 4', install 8' bed. '55 GMC 370 w/270, 420 4 speed, grain, dump bed truck from ND. Works OK.
