RobbyDawg

I wonder if the 2014/‘15 design is a carry over from 2013 and prior models which as we know had no trans stat. Since the trans t-stat is closed until 180, there’s no warming of the ATF going on at all. Now with my pill flipped the ATF is actually warming faster which might prove beneficial to fuel economy, (very slightly).

2014 and I believe 2015 trucks route atf first to radiator then condenser cooler. I did the pill flip today and didn’t see trans temps above 170F. We’ll see how it does in 5 months when it’s -20!

So, I bought the 23370657 from the dealer. The included TBV did NOT have a 70 stamped on the bottom, but I bought it anyway because I needed the lines. I don’t believe the lines can be purchased without the TBV. Anyway, I installed them (fit perfectly) and sure enough trans temp went up to 190 ish. Was thinking of buying updated TBV on its own, but I’m going to try the pill flip first now that I’ll be able to actually get the darn thing apart. I live in cold climate so was thinking against this with the concern of over cooling. However, on my 2014 the ATF goes through the engine radiator then the air to oil cooler so it might be okay. I’ve got nothing to lose by trying it. Sheesh…after I get this sorted out hopefully I’ll have a reliable truck for many years to come. Already had a custom tune done to turn of AFM and modify TCC logic.

After much searching I’m 99% sure the correct part is 23370657. Stealer has them in stock so I’ll be able to check it out before plunking down my cash.

I have a 2014 Sierra and attempted to perform the pill flip, however I live in Ontario and our road salt has thoroughly corroded the thermostat housing to the point that opening it up proved impossible. I want to perform the TSB to replace the stat with part number 86774933. I know the cooler lines are different and will require replacement for this to work. Does anyone have the correct part numbers for what I require? I called the dealer and predictably, they were absolutely useless…the parts guy couldn’t have cared less. I read here that 85132191 is the part number for the entire thermostat and lines assembly but am not sure if this fits my 2014. I don’t think it does bc my truck has the lines going into drivers side of radiator whereas the descriptor for that part number says “Wo atf cooling connections on left side of radiator.” Does anyone know for sure?