Hope youve got a widebody.
I'm about 350 at the CRANK and I can barely keep traction with 245-17's out back (Falken FK451) and a fresh LSD. 1st and 2nd are just lots of wheelspin in the higher revs,although it will hook up well below 5K rpms.I dont think you can fit 245 wide tires with stock fenders unless you really push them inward.Problem then is with a solid axle,your gonna have inner wall tire rubbing when the axle rocks in situations like driveway egress and parking lots with sloped approaches. Mine rubs a bit even with H&R spacers pushing my 17x9s out 10mm.