Yes, a Superior Super 35 kit comes with either an ARB air locker or Detroit automatic locker. You can easily run 35" tires locked as hard as you want with no problems. Ask Jerry Bransford about the jeeps he has seen in Johnson Valley with the S35 kits and how they hold up. Most breakage stories from a Super 35 kit are from poor installation, not from a lack in strength. Unless you can weld new brackets on a Ford 8.8 or find a tj dana 44 for cheap, the S35 is a great option. About $1,200 and you get new shafts, bearings, and a locker with strength for 35" tires no problem.