New Tires for Dually

I replaced the front tires 3 months ago with Good Year Wranglers. Now, my two outside rear tires need replacing. The inside two still have 5/16" tread.
Am I okay just replacing the outsides & getting replacements for the insides later?

Thanks
CS

I'm I okay just replacing the outsides & getting replacements for the insides later?

No you should replace all 4 rears together. Even if you replaced 2 on one side and put the 2 with 5/16th on the other there would be a big difference in circumference that would made the axel spider gears make up the difference in revolutions

How about putting the two good tires on the front and the 4 new tires on the rear? Think that would be the better option.

When I bought my current truck I had different sized tires on rear and front. When I put it in 4 wheel drive I felt all kinda of vibration. The dealer said it was from the different sized tires from front to back. I ended up putting all new Michelen tires and sollved the problem.
Ron