Hey fellas! I'm the seller of the kit Caulk posted (thanks!).
@Wild one tipped me off about this thread and asked I pop in.
Happy to answer questions anyone may have. The main ones I've been getting are below along with the updates done to the kit since the first one installed on my personal truck.
Kit Updates:
-Changed the cooler return to thermostat hose end from a 180 swivel to a 90 swivel
-All connections to the factory lines and cooler now use ORB hose ends instead of ORB to AN adapters with AN hose ends. It costs a little more, but this removes (4) components and potential leak points from the design.
FAQ's
1. Will this work with a bypass installed? Short answer is yes. The only downside is longer warmup times but it's not much of a concern unless you live where it regularly gets down to 0 or below in which case you're probably better off keeping the heater functional. I am actually in talks with Caulk to bulk buy his bypass to package with this kit as an installation option.
2. Should I get the 165 or 185 degree option? In most cases I recommend the 165. It will stabilize between 160-180 or about 20 degrees cooler than factory. This is the low end of ZF's recommended temp and I personally like the extra cushion on the high end for if you encounter extreme conditions like a heavy load on a scorching day. Climate and usage is a consideration though: I put together a kit for a gentleman in Alaska and we landed on the 185.
3. Why is it so much? I get this one a lot: You can buy the thermostat for $160 so at first glance the kit is overpriced. However, making it application specific adds up quickly and I have a couple hours of time in assembly, leak testing, packaging, and shipping drop-off. Add in shipping cost and selling fees and I make a lot less than you'd think, but it's a fun side gig for me and I enjoy being able to share knowledge with the community.
4. How hard is the install? Installation instructions are included to make things easier. I usually say the difficulty is about a 4, with 1 being an oil change and 10 being an engine rebuild. The hardest part is getting to and removing the snap ring on the factory thermostat. The rest is a breeze.
5. Do I need anything else for the install? Per the instructions, you need basic tools as well as snap ring pliers and torx sockets. You will also need a quart of ZF or Mopar 8 speed fluid to top the system off.