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Message: [QUOTE="sonic blue l, post: 1471071, member: 5185"] My 6l used to run at around 150 deg f no load. 6.4 always around 170 deg f no load. if you take a cooler line off a 6.4 at the rad cooler when the vehicle is cold you wont even get a drop of fluid out of it. So what im getting at is ford upped the operating temperature of the 5r110 from the 6l to the 6.4. Pulling the same weight between the two trucks (Same 5th wheel trailer) I have found the 6.4 trans would get hotter, however its starting off hotter to begin with. (hottest ive ever seen was around 200 f, pulling a 15,000lb 5th wheel in the mountains. on flat ground and moderate hills it stays around the 170 mark.) Now on my lightning (4r100) on the hiway it wont even hit 100 deg f, only in stop and go traffic will it get to 150 ish. If you have a tuned truck, you could also have the cooling fan come on earlier. the above was with no change in the fan temp engagement as I didn't have mcc then. Now I turn my fan on a bit earlier for both the trans and engine temperature. [/QUOTE]

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