steering play gillig chassis

#1
any one out there know a trick to fix a loose steering box in a 89 beaver?have looked at everthing else to stop road wander its driving me to sell it.installed a saftysteer also didnt help only 25000 miles on coach well cared for 2nd owner 4" play in wheel up and down cant see any thing loose even up on a rack would eppreciate any help taking a trip this month would like to fix before i go.thanks :cool:
 
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