BlaineBug

I've never had this issue but I notice that when the weather is COLD and I'm also using E85 that the cranking is longer than usual. But maybe by 1 second or so.

A safe alternative for us who live in regions where we see extreme cold is to install GM's newly revised thermostat bypass assembly which now contains a lower temperature thermostat.

I have heard of Kryptonite before. They make a variety of custom suspension components from what I know that do seem to be fairly beefy, hence the name.

That looks to be a drop-in replacement for the PILL that's length is equal to the thermostatic PILL when it is fully extended (which means full flow to coolers.) If you've ever opened up the thermostat bypass assembly you will know that the PILL is supported by a spring at both ends which allows it to recirculate flow back to the transmission in the event that a cooler line ever becomes clogged. This is a safer alternative than simply flipping the pill. OR another safe alternative is tapping and plugging the assembly and not reinstalling a pill at all. OR in my case I recently installed GM's newly revised thermostat bypass assembly which contains a lower temperature thermostat.

I can agree on hot temperatures degrading performance when it comes to combustion air, but this is much different that heat transfer to aluminum lines flowing oil. One reason why I've always stuck with factory air intake boxes. Some cold air setups get it right but most don't, either sucking hot air from the engine compartment OR acting as a straw to suck up water, which I've seen happen. Neighbor had a Mazda blow an engine in a flood as his "cold air intake" was mostly a K&N conical filter relocated closer to the asphalt pavement, D'oH!

No. Only if the headlights are on (and fog lights are off.)

So if it's getting warm that will also impact trans temperature. On any day even a hot day I don't see under hood temperatures having a significant impact on the trans cooler lines that run through there to the front of the vehicle.

It used to work before? Are your fog lights on? The automatic high beam feature (intellibeam) does not function if the fog lamps are enabled.

The AC condenser does get warm, as heat in the cab is taken out.

What do you believe the life expectancy of the G80 clutch discs is?

Does the icon illuminate on your cluster? Should be a traditional highbeams logo with an A within it. I believe it's green whereas the highbeam indicator is blue.

Where is the heat coming from if not connected to the radiator for a fluid to fluid heat transfer mechanism? I know these trucks run the A/C if in "auto" mode on the climate controls so the condenser would be my only theory, since the condenser does get hot in normal A/C mode.

With that being said I haven't had any issues in 2 years of ownership and a stock SUV. Although it is apparent when it engages, you can feel a good clunk when the locking pawls catch! I've also rebuilt a Ford 8.8 limited slip, but that is always under tension and never operates as an open differential unlike the G80.

https://www.eaton.com/content/dam/eaton/products/differentials-traction-control/mlocker/eaton-mlocker-brochure-2009-en.pdf

I apologize. I was formerly under the assumption that it was a "maintenance free" locking differential. It also does NOT need limited slip additive. I know that part for certain at least.

Now that I look into it, it appears all of the G80s have clutch packs.

I don't know, but if it was a different design using friction discs I would think it would use a different designation than G80.

The G80 doesn't use clutch packs.

No problem.

This sale is for 1 (one) General Motors General Motors/Chevrolet/Cadillac part number 13511136 transmission cooler bypass valve/thermostat assembly. This bypass valve/thermostat assembly has been pulled from a transmission with approximately 43,000 miles on it. Would be a great candidate to tap and plug if you're interested in removing your transmission cooler thermostat entirely. $40.00 sale price includes cost of shipping and handling.

If you're theory is correct that means that the new thermostat starts opening at 135'F and is fully opened at 158'F.

I got a chance to install this revised cooler bypass/thermostat today. I disassembled both the new and the old. The OLD pill is labeled V180 while the NEW pill is labeled V135.