Although I think your current gear hunting may be the result of more than just your high differential gears, I do not have an automatic so cannot say for certain.

Regardless, you are going to need 4.30, at least, with the bigger tires. 4.56 will probably work out well too.

If it is still hunting with 4.30 or 4.56 - see what they say over on the transmission forum.



..........Scott