Only thing I did was loosen up the bumper and raise it up just enough to allow the tire to rest on it. This took away most of the stress on the factory tire carrier. As tire sizes vary so much, your results may vary. The last pair of 35's I had were KM2's and they fit perfectly.
Mine rested great on my bumper and I didn't have any problems for a long time...until I backed into a tree and bent the gate up a little. Now I have some spot welds that look like they may give up somewhere down the road so I only throw the spare on there when I am going wheelin, which is about never anymore. Someday I will step up and get rear bumper with a carrier.
2007 Rubi Unlimited. Teraflex 2.5 lift + Fox shocks, Nitto Trail Grappler 35s on XD Addicts, 5.38s, Ten Factory rear shafts, Riddler diff covers, Purejeep front axle truss and Teraflex gussets, Tatton front driveline, Rugged Ridge Modular front bumper with XRC8 Comp winch, Superchips programmer, Volant intake, MBRP exhaust, Hella H4 headlight conversion, Body Armor "not so Extreme" Rock Rails, in-cab winch control,Best Top Trek Top.-Sold
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