OK thats why i said it was worth having a look at them ..the symtoms on mine where just as you described and i adjusted the box and still had a lot of play at the wheel which i thought was strange and it turned out that all the play was in the tie rod ends but untill i had somebody sat in the cab and moving the wheel back and forward i could see that the box was doing its job and was actually moving the tie rod nicely but the slop in the ends was giving the impression that the box was bad and i was dead chuffed i hadnt spent a ton of cash on a new box .. just trying to be helpful
When having my 57 chevy car box done found to be the same as jeep ,strip box and check bearings they can be changed what normally wears is just in the centre part so be careful as if turning to full lock it can jam.
I would do like it says here though when adjusting the adjusting screw have it on full lock as has been already said most of the wear will be in the centre of the worm and if you adjust it here it will lock up on full lock 1955 Chevy Truck 2nd Series Shop Manual.
I adjusted the worm bearing via the adjuster at the front of the box.
The truck was on a ramp then jacked up so there was no weight on the wheels.
I have not adjusted the lash adjuster as per the manual as the exhaust manifold was in the way.
I've not had chance since to have another look at it yet.
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