Hey guys, first post on these boards. I have an 04 ext cab 4x4 with the 5.4...


My question is what is too hot for transmission fluid? While towing the other day, probably around 8k, in 90 degree heat, the transmission temp would get up to around 220. The overdrive was off. I am going to chalk it up to the heat here in Texas. This is my first time towing in the summer with my Edge, so that is why I noticed.

Is that too hot? It does get back down to around 205 once I am on level ground and not going more than 65 or so.

Are there any aftermarket BOLT IT coolers that are larger? Anyone know if a superduty's cooler would work. I am not against fabbing up a bracket or anything, but would like to keep the ghetto factor down on this truck.

Thanks.

ps truck has 80k on it.
pics

 

no idea...look at U-Haul. They sell transmission coolers. Might have some luck there.

Superduty cooler would probably be a good bet. and if you're lucky, it uses the same fittings/lines to connect

 

According to the folks at TCI the optimum temperature range would be between 175º and 225º.

Here's more info from them (TCI)...

"At approximately 240° F, important additives in the ATF begin to cook. The result is the formation of varnish inside the transmission. At approximately 260° F, internal transmission seals (which are typically manufactured from a polyacrylate material) begin to harden. The end results are leaks, both internal and external, simply because the seals lose their elasticity. At approximately 295° F, transmission clutch plates begin to slip because the oil is breaking down further. At approximately 315° F, seals and clutches effectively burn out. Carbon forms in the oil and for all intents and purposes, the transmission is junk. Just for your information, a typical transmission will die within 2000 miles if subjected to 300° F+ heat."


Here's more the link for more info...

TCI - ABOUT US

Hope this helps!

 

great info in that link. Thanks for the help.