Ginga, a few tips -
The search tool on this forum is an excellent utility.
Keep your search string short (fewer words) and scroll through the relavent information looking for your vehicle type.
I typed in Mickey Thompson and then looked for articles relating to Grand Cherokees, hope the below link helps.
The discussion was "can or can't you fit larger tyres".
Try and be more specific whan asking a question - state your vehicle's mods so that those who read it are more likely to help you, & not dismiss your request as being too difficult.
In this case there were two answers, if you have a Heavy Duty OME lift yes, if you have a Light Duty OME lift - possibly yes or no!
Read on -
http://www.ausjeepoffroad.com/forum/...thompson+tyres
Good luck with the new tyres!