Hello everyone, finally got my 4D55 back in time after swapping the head. Thanks for the help! Ended up having an issue with a plugged radiator as well. New radiator, water pump, thermostat, 4D56 head. The truck seems to run a little bit warm I haven't really ran it down the road because of this. On the temp guage in my ranger, it sits around half with the heat on with no load, and goes up to a little over half, probably 5/8ths with the heat off when driving down the road. What is normal for the 4D55? Just looking to see where everyone's temp gauge sits. I am thinking that buying a higher quality thermostat would help. I'm a first responder, and haven't really driven the truck because I don't want to end up with overheating issues at 2 a.m. Thanks in advance.