Are you SURE you want to run those gears that tight on the back lash?
I wouldn't tsk
What do the instruction call for on the minimum? I wouldn't run the back lash any tighter than what the manufacturer calls for at room temps. twocents
As already pointed out check the back lash in several different locations, I try to check them 90 degrees apart scope up wrench

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)