If you don't run your ATF temp around 200F then the water in the fluid will not boil out.
Yes just from humidity, water gets in there. Need to run hot to get the water out.
But not much over 220F Seals start to degrade at 300F. So cooler is not always better.
They do make oil thermostat bypass devices so your cooler only flows when needed.
-Doozer
You are correct. I found this on the DMax store
How hot should your Allison transmission run?
If you own a 2001-2004.5 LB7 Duramax your normal operating temperatures will run around 160-180 degrees. These transmissions will warm up when towing or driving in the summer months. 200-225 is very common when the ambient air temp is 80-100 degrees and your transmission is under an increased load. Temperatures from 230-240 have been reached with no damage to the transmission. If you are seeing temps above 225 degrees on a regular basis you should check your fluid level. Fluid levels to high may cause excessive temperature. Higher mileage transmissions or trucks using aftermarket tuners with increased power may be experiencing converter slippage and will see increased heat. A quality replacement converter and or a full transmission upgrade may be required.
The 2004.5-2010 These transmission will run a higher normal operating temperature than the LB7 models. Normal operating temps will range from 180-200 aprox 100 degrees above ambient air temps. These transmissions will run from 200-230 in the summer months when towing in hilly areas. These temps are normal and will not hurt the transmission. If you are seeing temps above 235 degrees on a regular basis you should check your fluid level. Fluid levels to high may cause excessive temperature. Higher mileage transmissions or trucks using aftermarket tuners with increased power may be experiencing converter slippage and will see increased heat. A quality replacement converter and or a full transmission upgrade may be required.
City driving empty temperature is around 180F towing my trailer it goes to 195F and on the highway empty or towing is down to 175F.
Guess the guy at the transmission shop was full of it, since he told me i should keep the temperature below 175F.
So I am just going to better secure my current oil cooler and run some decent lines now that i got my adapters on the mail.
Time to put this thread to rest. Thank you everyone.
