What are the biggest tires I can fit on a 2003 F150 (Supercrew Lariat FX4)?

What are the biggest tires I can fit on a 2003 F150 (Supercrew Lariat FX4)? I am using the stock 17" fx4 wheels that came with the truck. I am also putting a 3" Body lift kit from performanceaccessories.com. Here is the information on the lift kit: Part#: 70043 from website... show more What are the biggest tires I can fit on a 2003 F150 (Supercrew Lariat FX4)? I am using the stock 17" fx4 wheels that came with the truck.

I am also putting a 3" Body lift kit from performanceaccessories.com. Here is the information on the lift kit: Part#: 70043 from website http://www.performanceaccessories.com

I'll also be cranking the torsion bars up as far as they will go to give some extra room.

I want to get some BFG All Terrain tires, and was hoping to get a set of 37" tires on the truck with the modifications listed above. I've heard that the BFG 37" tires actually measure to be 35".

Here is a link to a guy that has an 03 f150 supercrew fx4 just like mine, and is supposedly using 37" tires.

http://www.cardomain.com/ride/2914609

Any information you can give would be greatly appreciated. I'm also NOT really willing to do any additional modifications other than what are listed above... with exception to maybe something small. Thanks for the help! =)
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