My 04 F150 super cab 5.4 l 2 x 2 came with Dynapro p235 70 R17 tires. I'd like to go to a LT 245 70R17 as I'm towing a 5th wheel. I have Hellwig helper springs. Would I have to modify anything. Ford didn't offer a optional tire at the time of purchase.

 

Just keep in mind that a taller tire will result in a higher final drive ratio which you will feel when you pull your trailer. It's like putting in a different rear gear. Going from a 3.73 to a 3.55 depending on tire size. If you are pulling a max gvw trailer, I would stick to the stock size unless you are willing to also change the rear gears.

Good luck.

 

You don't have to do a thing. A single step up in tire size like you've noted, isn't enough to worry about. That's only a 1/2 inch increase in overall diameter and a little more than 1/4 inch increase in width.

 

Thanx for the input guys. Much appreciated

 

get rid of the hancooks...thier 2ply's of tiolet paper...LT 245 or LT 255 or even 265 70 17 will be ok, ( I put BFG RT T/A 265 70 17 0n my 04 ) and I tow...the odd travel trailer ( no Fith wh ) and horse trailers, quads, ect..