I have all stock suspension with boiler 3/8 shims in the front.

I was at pep boys and really liked the "definity 245/75/16 M/T dakota" tires.

Anyone know if they fit? $138 a piece 4th one free...

Yup, they fit. I had 245/75/16 Hankook M/Ts installed and wish I would have gotten 265s after I installed the Daystar lift.

awesome, cant believe how much bigger a 245/75/16 is then the stock tire.

It will rub unless you do some trimming on the fender and pound the pinch weld

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2008 KK Liberty
Inferno Red
Daystar 2" Spacer Lift With SkyJacker Hydro Shocks
JBA Gen 5.5 Upper Control Arms
Rokmen Riddler 8.25 Differential Cover
2 KC Slimlite 100 Watt Driving Lights on JK Light Bar
245/75/16 All Terrains
Mopar Front Tow Hooks
Mopar Rear Tow Hook
Mopar Skids

so whats the biggest i can go without rub/modification?

Elt31987 is correct, there is some minor rubbing if you turn your wheels all the way, to either side. that is on a flat surface w/o flexing and w my Goodyear Silent Armor, which are A/T not M/T. I think M/T pattern would create more rub, that might not be the case because it also depend on the tire. I would run to Pep Boys have them put them on to test for fit and have them help you determine what would be the biggest you can fit w/o mod.
Here is a couple of pictures of my Wheels w GDYR

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08 Jeep KK Blue. Currently Stock.

Hankook 245/75/16 M/T I didn't have any rubbing except at full lock full compression (which I didn't assume you would be doing much off-road with your tire choice) Maybe my KK is different from others.

I have 245/75R16 Goodyear MT/Rs on my KK, but I also installed a 2.5" Daystar lift as well. I have no issues with rubbing at all with the lift installed. I would imagine that they would rub at stock ride height.

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2008 Silver Jeep Liberty Sport 4X4
Mods- 245/75R16 Goodyear Wrangler MT/R, tinted front windows, MOPAR skid plates, tow hooks, MOPAR SRT pedal covers, Daystar 2.5" lift, K&N filter, MOPAR Remote Start, NGK Iridium plugs, Pioneer deck, MOPAR Kicker speakers, Mopar bumper guard, Mopar bug shield, Rhino lined hood and grille, Enkei wheels.