Basically this fits any truck with the Borg Warner 44-47 transfer case which started production in mid 2012 and is still the current T-case in 2018. I purchased this so I could do some electrical testing on a project I was working on, I never installed it, just used it for bench testing. I no longer need it, so I'll pass it on to one of you 4-4.5 Gen owners to add to your small parts bag for emergency trail repairs. They sell new for $50-$60. I'll let this one go for $40 and I'll pay for shipping to anywhere in the USA
. Oh what the heck, I'll do Canada too. (insert Canadian emoji here) 
You'll know when yours fails because the 4X4 indicator lights on the instrument cluster won't correspond to the manual shift lever position. If the truck doesn't know it's in 4-Lo, it won't allow the lockers to work, unless you're hardwired or have a bypass.