I am currently running 33x10.50's on my truck. I would like to run 35's what modifications would let me run 35x12.50x15lt.

 

Tell us about your truck, rims, back spacing, etc...

 

84 f150 15 inch rims 5 lug

 

Stock rims? Not gonna work too well. The problem with stockers and a 12.50 is the sidewalls will balloon out to about 13.50" wide. These trucks can have a rub issue on the radius arm with a 31/10.50 at full lock, its nothing major but its there. With your current 12.50s they are actually about 12-12.5 wide. Sizes are like lumber and a bit smaller than list. Go to a larger diameter the width will grow to a closer to or exact 12.50.

Now they do sell spacer kits at parts stores to give you an extra 1/4" kick out. It can make a difference. Also if no lift is there and you go 35" you will be limited to carry weight in the bed. You could help this by cutting the inner lip off the wheel well, or trim about 1" off the wheel well and bolt on some flares.

But in a nutshell 35s will "fit". They dont look too bad. A cheap $110 body lift either 2-3" will improve the look a bit to a more natural stance. Add a 2" spring spacer in the front for a level stance. Hope this info will help or tell you more about what you want to know. If you need anything else lmk