Do not use lower unit grease, power steering or transmission fluid in your box. Also, 90-wt. gear lube is a no-no. You use axle-bearing grease. People call me all the time to ask why their shaft is leaking. The truth is most boxes are not engineered to use lubricants. Use axle shaft grease. It clings to the worm shaft, is water proof, and NEVER NEEDS LUBED AFTER THAT. PERIOD. The parts just don't turn that fast to cause any real friction.

Now there are only TWO, that is (2) adjustments on the box. Your large nut on the top regulates play when you pull up and down on your shaft. That's all it does. The other adjustment regulates play when you steer left to right. DO NOT tighten it all the way or it will BIND. You want about 1/2 inch of play on your steering wheel BEFORE YOUR FRONT WHEELS START TURNING. YOU can get almost ALL of the play OUT, even if your box is old and "TIRED".

I've had many old boxes and if you obey some simple rules, they will give you many years of faithful service. Sometimes people judge their boxes with their fingers. This is wrong. Mount your box, and pump your worm shaft slowly, let the lube surround your worm, once it gets lubed real good, give it some quick thrusts. If there is a feeling of nothing, you haven't got ALL the play out. Unscrew your nut, have your wife or girlfriend move it back and forth real slow. Screw it in a little tighter. Now tighten your nut.