Hi and thanks for using 2CarPros.
I am not familiar with the Bighorn, but I believe it is the truck that you are referring to. I looked up information on the 3.1L in the truck and attached a picture of what they provided as directions for replacing the filter. Because of the year, the information we have is limited.
It indicates it is located on the right side under vehicle. With that in mind, the directions they provided are confusing. However, the second pic I attached shows the filter mounted along the frame rail. Check to see if this helps.
Let me know what you find.
Joe
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Sunday, December 23rd, 2018 AT 7:58 PM