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Upon further review of what I read. The other sensor thing on the block has to do with the cold advance.

Yeah I got the fan problem. I believe I read somewhere that it has something to do with the cold advance too.? Either way it dosnt work anymore. Haha

Also the sound it was making had a spring like noise.

One picture of the caliper in the truck and another after I took it out.

Update So I could reproduce the sound by just backing up in a straight line in my driveway. After a few feet I would get a loud pop/bang. Took some time to stick my phone in there and take some videos. Narrowed the sound down to the right rear differential/brake caliper. I noticed in the video...

Tested the thermostatic switch. It’s no good. Got one on order. I’m thinking that’s the source of all my white smoke problems.

Also found a block heater on it so I got a plug. In addition I read somewhere pushing in the peddle while in the run mode does somthing with the cold advance.

So I had to unplug the time delay thing because the fan wasn’t kicking on and it over heated. I’m thinking that the time delay thing is bad or the thermo switch.

I hope it’s everything was tight and no pop. There is snow on the ground so I’m not going to be able to crawl under there until I get a warm day.

Did another little test in the driveway. Reversed again cut the wheel hard to left and got the pooping noise. Pulled forward straightened out shut the truck off and put it in HL. Turned on reversed cut the wheel in the same manner. No popping. Not sure what that means or confirms. Probably all...

Checked the rotor to CV’s those were good. What was loose was the bolts holding the entire brake caliper to the diff. I tightened those down after taking things apart to get at the bolts. It still produceses the sound.

Yeah it’s tuff to figure out where the noise is coming from exactly. Now I can recreate the noise I can see if I can try to pin point where it is. And if it’s normal.

Thanks for the quick response!!! It was kinda driving me crazy because I couldn’t figure out what was make that loud crazy popping/boom sound but yet drive perfectly fine around town. Figured something was going to have a catastrophic failure and was going to have to learn to rebuild something...

So my truck developed a rather loud binding popping noise. Back ground- drove the truck a few weeks ago on the highway and melted a fork in the transfer case. Drained oil- only had about a cup of oil in there, plus the pin was missing on the shifter fork. Fixed that cleaned it up put it back in...

I was just making sure. I didn’t want to slap it back up there with out fixing everything.

Is it ok that there is transmission fluid dripping out from where it meets transfercase. Not sure if there’s a seal in there or just a baring?

Also notice the pin holding the range fork in place was missing and the fork was free floating on the rod. Not sure if it fell out during disassembly but I feel like the pin should have been in there pretty good?

Open it up today. Looks like my transfer case range fork is destroyed and mode fork plastic pads are melted. But other than that everything else looks good! Looks like the chain was replaced in 2013 (etched into link).

Thanks for the good info.

Anyone know if there is a rebuild kit for the 242. I see there is one for the 242 that is in Jeeps. Not sure if there is any difference is baring size or seal sizes?