I have a few problems with the descriptions you are using - what are "steering arm" and street arm"?  
If you get someone to wiggle the steering wheel the full movement before the wheels start to move, you can then see or even feel exactly where the lost motion is occurring. If all the tie rod ends are new, check the steering box, movement of the pitman arm (the arm on the steering box) to make sure it is not moving on the shaft, check that neither the top nor bottom arms on the steering relay is moving on the shaft and that the relay itself is not moving. If the relay itself is worn, the shaft will be moving sideways in the relay body, but the arm moving on the shaft can wear the shaft so that it needs replacing. 
Also check that there is no free movement of the LH steering arm on the swivel housing, as can happen if the fitted bolt is either not fitted or is in the wrong hole. 
Free movement can also happen indirectly because the springs are able to move sideways in the chassis due to worn bushes, or the axle on the springs due to loose U-bolts, and make sure both the taper connection and the screw into the tube on the tie rod ends are secure. In particular, make sure that the type of tie rod end matches the type of tube - early models had the clamping on an unthreaded section, later ones had full length thread and clamping on the thread. The two types must not be mixed in a joint, as they cannot be clamped satisfactorily.
				
			 
			
		 
			
				
			
			
				John
JDNSW
1986 110 County 3.9 diesel
1970 2a 109 2.25 petrol
			
			
		 
	
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