If your truck doesn't have the 4x4 auto feature it would be the first Bighorn I have seen that doesn't unless it's an Outdoorsman. If you purchased the truck used it's hard to say exactly why your truck wouldn't if it's not the Outdorsman. Now all that being said the last thing most people who use there trucks is heavy mud or severe use is the auto 4x4 feature. The 44-44 transfer case has had several issues with engaging and overheating the clutches when pushed hard. The 44-44 transfer case is never fully locked in 4x4 even when 4x4 lock is selected. The rear wheels have to spin a certain amount before they engage. There is actually a thread devoted to Removing the 4x4 auto feature and installing the 44-45 non auto direct drive transfer cases in Bighorns and Laramie's and other truck that come standard with the 4x4 auto feature. The Rebel and Outdoorsman come with the 44-45 non auto transfer case even though they are well optioned trucks most likely because they are much more durable than the 44-44 auto 4x4 system. They have been successful in converting the trucks with the 44-44 auto system to the 44-45 non auto system so I'm sure you can reverse that and install the auto system in your non auto truck if you wanted but I would reccomend doing your research before you do and Google all the issues people have had with the 44-44 transfer case and be happy for whatever reason your truck doesn't have one.
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Thanks..
Its actually a friend's rig.
Its definitely a Big Horn.
I've pulled the build and window sticker.
The build sheet actually says it's an SLT with the big horn trim. It is a fairly well optioned truck..
I am learning more and more it is very odd that it does not have Auto 4x4.
My father in-law has a 15 Big Horn with the auto.
The reason why we like the Auto 4x4 here and Ontario Canada, is for the snow.
It is a very good and useful feature to have.
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