t case question
 

I got a guy wanting me to rebuild in transfer case in his 99 ford powerstroke 3500 single wheel I was wondering what is that tcase called for I can research this more

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think I figured out it is a NP271F transfer case has anyone ever rebuilt one before ive done everthing front a 5-18 speed transmission but never messed with a transfer case but surely it aint that hard to do