[415stinger]

My trans went into limp mode yesterday while towing a 1500lbs trailer with the cruise set at 60mph. I started up a small hill and trans down out of gear and went into limp mode in 3rd gear. I checked the codes and found a P0700 & P0735. In addition, I recently installed 285/75R16 tires (1400 miles ago) which is up from 265's. Juice was set on 2.

Is the trans toast or could this be an issue of still learning the new tire diameter (According to the attitute monitor, I'm getting a lot of slip in 4 gear)?

Thanks!