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Message: [QUOTE="4cstr, post: 219953, member: 516"] I trust Mark without a doubt here. I'm proof that at that temps...using a quality fluid...there isn't an issue. I run Mobil synth in my tranny. One summer while towing in the Black Hills...I took a wrong turn and got stuck in a high rpm, low speed situation (very steep grade with a lot of switch backs). No place to pull off. By the time I got to the crest of the hill (mountain) my tranny temps were pushing 230*...and yes I was crapping my pants. My total time above 220* was probably 20 to 30 minutes. I had just put the tranny in the truck about 4 months prior. I called the builder of the tranny (also somebody involved in Ford transmissions) and he told me not to sweat it. I pulled a sample and sent it to Blackstone...and they said it was fine. I ran that fluid for another 50k miles before changing it out. No issues what so ever with the tranny to date. I have the stock tranny cooler (early 99's didn't have the cooler in the radiator) along with a tru-cool max out in front. I do have the large 6L cooler in the shed waiting to go in...but haven't found the time yet. Anyway...everybody is entitled to their opinion...no issues with that. But I know that Mark has the facts to back up his opinion. [/QUOTE]

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