Change gears to match tires

[airfrm]

Hello all,
Last year I put a 6" lift on my 2007 F150. It was stock before, and now I have 35" tires on it. The stock gear is 3.73 on a 9.75 axle. Can anyone help me or lead me in the right direction to figure out what size gears I would need to change to go back down to stock. Not sure if there is some sort of spread sheet or if someone else has done this already.

Thanks.

[anaheim_drew]

Here you go

4Lo.com :: Tire Size Change, New Gear Ratio Calculator (http://www.4lo.com/calc/geartire.php)