Well all the research I have done on the 4L60E and 4L70E trans failure seems to be a result of either a heavy foot and tuning shift points to bark the tires, and/or HEAT. Heat being the main factor.
I have a 2007 Silverado MAX. The trans cooler has a fan on it. What about adding an additional cooler to the side?
I also have a 2001 Sierra and the trans cooler on it has no fan. Im wondering opinions on an additional cooler or if for some reason this would not work and have some kind of effect on the pump and pressure because of the distance the fluid had to travel.
Open for suggestions.....THANKS!!

 

Are your trans temps being a problem?

Anywhere from 170-200 is just fine.

 

170-200 is very high IMO.

Most of us ditch the stock crappy cooler and run a Tru-Cool without the bypass.

 

According to fluid life charts, those temps are best for fluid life. Higher temps can burn up the unit quicker and real low temps could cause extra wear and not allow for condensation burn off.

But fluid life is not ideal for everyone/every car/every situation.

 

170 is fine, 200 is a bit higher then optimal. I target 150-170.

 

My 4L80E stays in the 150-180 range. Factory 1-ton in-radiator cooler with a big Derale cooler with a fan plumbed after the factory cooler. The fan has a temperature switch plubed in line after the Derale cooler that turns the fan on if the fluid exiting the cooler reaches 175°F. I think I have heard the fan run about 5 times in 100°F weather towing 6,000-8,000 lbs. The mechanical engine fan does a great job keeping the temps down.

 

Mine rarely gets over 150.