That new thermostat is the same as the factory one in my 05 Dodge 3500 5.9 6 speed manual trans .

Put a Mishimoto Thermostat on my 5.9L 24 Valve Cummins. Worked okay for about 18,000 miles. Coming from Las Vegas to SoCal via Death Valley .. my coolant gauge almost maxed out. Long story short. When I got home I pulled out the Mishimoto Thermostat and found it had some kind of plastic inside it which was pulled out by pressure. Furthermore, during the 18k miles I had it, operating temperature was always low. In other words, the Needle Gauge on my Dash would always read to the cool side. But with an OEM thermostat, the needle would always go to the middle when the engine was at normal operating temperature. Bottom line, I tossed out the Mishimoto and put in an OEM and the truck is happy as can be. The Dodge engineers are smart. They also do a lot of testing prior to manufacturing. They know exactly what is best and there's no use in trying to put in expensive after-market parts which are not up to OEM standards. I do a lot of towing. Keeping the radiator and other components clean is also essential.

I have an '05 with a nv5600 and tow everyday and now that I'm pushing 500 hp I am having cooling issues too. Thanks for reviewing this thermostat and saving me the money. Current mods are S&B cold air, Banks intercooler with monster ram, Pro Flow 4" turbo back, Quadzilla boost fooler, and the Smarty POD tuner. Just got in the mail today from BD is their VGT turbo kit for the 5.9. Also from Strictly Diesel I just got in the mail their cooling fan clutch adapter to install the mechanical clutch from the 7.3 Ford so hopefully no more cooling fan issues because you know I have the fan speed code. Last week I bought a new "aftermarket" fan clutch and within a couple of days it leaked all it's fluid out covering my fan and shroud!

Mine will hit the 230s while towing uphill, rarely though. Doesn’t bother me one bit.

I’ve got a Stant Superstat in my 2000 Cummins. Trucks putting down roughly 425-450 hp and it rarely breaks off of 190. Even when I’ve grossed 28,300 lbs pulling hills at 1100-1200 egts coolant temps stay at 190. Was gonna post a pic of thermostat info but can’t figure out how.

Doesn’t help putting a cooler thermostat in if your COOLING FAN DOES NOT GET TURNED ON AT THE LOWER TEMPERATURE PERIOD if you had electric fans to turn on sooner would help and ac on will partially turn on and if you want cooler just make a plate with a 1/2” hole to slow the flow down if you’re removing the thermostat the water is flowing to fast for the radiator to extract the heat

Hey man of all the upgrades to the truck you have made for towing what has benefited the most? Never asked but what are you running for a tune?

Sam you’re a boss!!! Cummins all day baby!

I put a 180 in 05 5.9 to try to keep 5-6 cylinders a little cooler , don’t know if it helps don’t know but the heater blows hot air twice as fast as a 190 .

I recommend to drill it before you buy a 60.00 dollar thermostat. That's what I paid and was hotter then oem .

I'm curious about your front bumper and flat bed. Who made them and do you like them? Thanks man. Loving the vids. Maybe do a vid of your trucks trailers and equipment?

Have reprogram fan to kick on at 180

I'm curious at how warm it would run without a thermostat

Mine runs over 200 degrees empty no trailer? Not sure if that's too warm

Is the fan kicking in early enough?

meth injection would lower those temps.

Sucks it didn't help you too much.