Ya it really depends on how you drive. 39Æs would be the absolute max if youÆre where just driving around town and hitting dirt roads now and then.

If youÆre actually going to be 4wheeling I would say 33's. 35's if youÆre a good driver and enjoy trail repairs.

But really the stock IFS was only designed for the stock tires. And they really meant it.
If I had to do my trooper over again I would have either left it totally stock, or I would have spend my money on a strait axel. With coils and a conventional 4 link with panhard setup.

Steve C