I want to address your rear axle; brown is the only color the D-35 comes in.
I'd say go with a smaller tire 'til you upgrade the rear axle, I think 28" is stock.
I don't have experience with a 4cyl, but I started with 4.56 and after the front ring gear broke(because of a poor set-up job) I went to 4.88 and 35s.
4.88 is recommended for a 4cyl w/33s.
Yukon, from S Koria, seems to be favored by most shops?
The cost of the gears and set-up kit is almost $250 per axle, proper installation is 2-$300 per axle. Don't put money in a D-35, especially more than a fluid change.