I have MT 305/45/18 drag radials on the stock rims and a pair of 275/40/17on 05 GT wheels.

I will be using the 18's as my daily driver tire, so I am leaning toward the 17's so I get more street use out of the 18's.

Run the 17's Greg. They are 25.7 in diameter as opposed to a stock 27" tall tire. It should change the 3.31's more like 3.51. The 18's are 28.8" tall and will change the ratio to more like 2.90 in that range. See your at Atco Burt and Earny (bright and early) as my boys used to say. I'll be hitting the LIE around sixish. We'll play with tires pressure and see if we can get them to hook. If you have a 12v tire pump bring it for the ride home. If not let me know and I will get mine from my garage at the office. Bring a stock spare in case you pick up something at the track. Won't be the first time that has happened. Guys always leave crap around and I am constantly picking up stuff at the track. If not I have a oem spare in the truck. Weather looking great for tomorrow.:)

Run the 17's Greg. They are 25.7 in diameter as opposed to a stock 27" tall tire. It should change the 3.31's more like 3.51. The 18's are 28.8" tall and will change the ratio to more like 2.90 in that range. See your at Atco Burt and Earny (bright and early) as my boys used to say. I'll be hitting the LIE around sixish. We'll play with tires pressure and see if we can get them to hook. If you have a 12v tire pump bring it for the ride home. If not let me know and I will get mine from my garage at the office. Bring a stock spare in case you pick up something at the track. Won't be the first time that has happened. Guys always leave crap around and I am constantly picking up stuff at the track. If not I have a oem spare in the truck. Weather looking great for tomorrow.:)

yea, putting them on now. I am prob leaving a little before 7. I should have a tire pump and i have the stock spare. Almost ready to roll.

yea, putting them on now. I am prob leaving a little before 7. I should have a tire pump and i have the stock spare. Almost ready to roll. Rock and roll brother. You will probably catch me as I did not opt for the Ecoboost in the F150. Opted for the 5.0. After watching the torture test on speed, should a could woulda. Then again love my 11 as it is still a Ford product and every year just gets better.