I changed mine (52 GMC, same seal) with the box mounted in the truck. You are supposed to pull the pitman shaft, but some of us have used a Lisle seal puller to drag out the old seal with the shaft in place.
Picture below is a leather stock seal being pulled with the Pitman shaft removed.
GM part number for the lip seal is 7801626. Federal Mogul 313842
It'll make your truck faster because the same seal is used on 1962-83 Corvettes.
Last edited by Bill Hanlon; 07/25/20263:24 AM.
'57 GMC 102, Original 347 V8, HydraMatic, 3.08 rear gear, added A/C, disk front brakes, HEI, AFB carb, '98 Honda Black Currant paint. T-boned and totaled 10/12 '52 GMC 152 Stake Bed, Original 228, SM420, added A/C, HEI, disk front brakes, '67 Chev 3.55 rear gear. Gets used as a real truck.
