yo NotOJ,
WELCOME!
To get accurate info when posting Qs, soon in your profile, include your year, Model (XLT, etc.) engine size; transmission, transfer case, locking hub types and any major mods such as body or suspension lift.
Left Click your name in upper right corner; in pop-up left Click on My Profile
Below an Ad, in right side. Left Click Edit my Profile
In Left Side, Left Click Change Signature
Is your heater providing enough heat after engine reaches normal operating temperature?