[cleszkie]

You fluid loss is pretty significant, even for a leaking pump seal. Have you checked your coolant in the radiator? Reason I ask is that the radiator has a built in tranny cooler in the passenger side tank. If that tank leaks, your tranny will pump ATF into your coolant. The truck will continuously puke out the excess fluid as you drive, leaving room again for more ATF. This could also account for your engine temperature increase, as hot ATF mixed with coolant in your radiator does not help the cooling system. Just a thought. If your coolant is an odd reddish color, or brown, you may have a leak as described above. This could also mean you have some water in your tranny. A check of the tranny fluid in the pan would confirm this if it appears frothy.