To help in adjusting the worm gear loading I had a friend weld up (I don't weld) a tool made from a 1/2" nut (3/4" wrench size) and a piece of 1/8" flat stock. The flat part has a curve ground into the end that more or less matches the curve of the slot in the worm gear adjuster screw.
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'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.