6L80 Heat Related Symptoms

[TahoeFL2017]

Holy Cow! I just did over 3k miles round trip to ID and back with 3000 lbs in tow and never went over 160F with mountain driving. My 2008 doesn't have the trans thermostat, so I think that's the key. Flip the pill or eliminate it with older model year cooler lines. A trans doesn't need to be 200F on a regular basis.

I had my shop take out the non-OEM thermal bypass and install a new OEM unit, now in FL heat 94 degrees it takes a solid effort of me intentionally driving hard, for it to get up over 180

So the lesson is don't buy knock off crap from the internet - the non OEM worked since November, then started sticking just in time for hot weather.

That cheap POS almost cost me a trans, but luckily caught in time - fluid is pink shift fine, got it up to 244 one time but shut it down really quick.