It is a Chrysler 8.25" with 3.07 ring and pinion.
Unless you are one of the very rare few with a V-6 with 4 low/high QT-II that came stock with 3.55's. If so, you will have a tiny "T" shaped lever near the gear stick to turn on 4 Low.
2015 Pro-4x Nissan Frontier/Factory rear electronic locker in factory modified rear Titan axle/2.5"Front\2"Rear lift
Sold-2008 3.7L QT-1 dark blue Jeep Commander/3+" modified OME lift with 3/8" Rocky Road strut spacer/4" rear SL springs/265/70/r17 Goodyear Duratracs (Load E)/1.5" spidertraxx spacers/F-150 Monroe Load Levelers/4xguard matrix, front guard, belly guard, and rock sliders/Airflow snorkel/Thrush welded exhaust/
Complete 3.07 to 3.73 V6 gear swap
Powertrax rear locker