This is due to the  starter being closer to the oil pan. 

Heavy duty skid plate that covers the lower portion of the Jeep 4.0 oil pan. Skdi plate is robotically welded, made of 7 gauge hot-rolled steel this skid plate can protect your vulnerable oil pan from rocks, dirt and other objects. Also very handy when working on your Jeep, this skid plate can be used as an easy jack point if needing to remove the transmission or other items.

  AMERICAN MADE PRODUCT