The TruCool 40K GVW cooler is NOT a LPD cooler. For those who live above or below the equator LPD coolers are a good thing for the trans when it's cold outside (and I don't mean only when it's 20 below).
Edit to add:
I have one of these I picked up really cheap in the event I do use something like the 40K cooler. It does the same thing as a LPD:
https://derale.com/product-footer/fluid-coolers/thermostats-1/fluid-control-thermostats/13011-detail
2nd Edit:
I bet half the condensers on trucks with 50k or more on them are partially filled with debris/dirt in the fins.........
Pull the top and bottom shrouds, fan and clutch, radiator brackets, shine a flashlight from the backside of the condenser and see how plugged the condenser is.
Shoot... it's not? I'm looking at the Amazon link and they state its an LPD cooler.
https://www.amazon.com/Tru-Cool-LPD...APQF94JE27J&psc=1&refRID=2Q1JDQSMBAPQF94JE27J.
Just playing devil's advocate here as an outside observer... But how do they verify something like this? Is it a VIN check or something? I bet there's a way to get it done under the radar. Maybe someone more well versed in tuning can chime in on that. Diesel K1500 'burbs were available with the 4L80E so it was technically part of a factory combo in your exact chassis.
I wish you the best of luck and I hope this solves your issues, but I do think your lift/tire combo combined with towing is probably stressing the 4L60Es pretty hard. I'd say the fact that you've blown up a few of them is evidence of that. Just out of curiosity what gears are you running in the differentials?
Yeah, they verify everything by plugging the SMOG computer into the OBDII and that computer checks everything, along with a visual inspection. Honestly, it's all up to the SMOG checker person with the visual. I had a guy who helped us SMOG one of our other vehicles with LT headers, but it's a pain in the neck and always a gamble. Also, paying someone $500 for a hot SMOG every 2 years isn't really an option I'd entertain either. I could see the 4L80e option being a great way to go if I didn't live in this state with garbage laws.
The thing about SMOG is it has to come factory equipped in your vehicle, or be a CARB legal modification. Even if the diesel K1500 suburban came with a 4l80e, my suburban didn't come with those components from the factory. Basically allows for zero legal flexibility in customization. Sure you can get away with anything as long as you don't touch the computers or trip the CEL. There are always workarounds, which I know of and have access too, but I've learned it's not worth the hassle anymore. If I have to start worrying about SMOG on this truck, it won't be worth it to me anymore.
I agree. The lift, tires, and gearing set-up isn't the best in my truck, and most likely the reason it is a 4L60e murderer. I'm hoping by beefing up the cooling capability 1000x this will be the last transmission this truck will ever see.
I will get some feedback from running 3.42 gearing in the truck (I know, not optimal) but I like to cruise doing 80 MPH (GPS confirmed) on the freeway without drinking gas (not towing, obviously). With my 3.42 gearing I can cruise at 80 MPH around 1900 RPM in OD.