Oct-22-2014 01:26 PM
Oct-23-2014 06:27 PM
christopherglenn wrote:
Most (all?) automatics have a cooling loop in the main radiator. Tow packages usually add a oil to air cooler as well. Pulling up a hill, the engine coolant is MUCH hotter, usually hotter then the tranny oil, and is actually heating the oil as it goes through the cooling loop. The aux cooler pulls some of that heat away, but the tranny temps climb. Before you reroute the cooling line to bypass the main radiator, when starting from a stop with a load, or any time the torque converter is unlocked, and you are under power it generates many times more heat then the aux cooler can dissipate, so you NEED the rad cooling loop.
Oct-23-2014 11:22 AM
N-Trouble wrote:carringb wrote:
The newer transmissions are designed to run hotter, as this lowers fluid viscosity which reduces drag and improves efficiency ever so slightly.
Not true for the current Allison. In 2011 they lowered the line pressure which resulted in significantly lower temps. I have yet to see mine even approach 200* pulling hills
Oct-23-2014 10:21 AM
Oct-23-2014 09:36 AM
Oct-23-2014 09:30 AM
N-Trouble wrote:carringb wrote:
The newer transmissions are designed to run hotter, as this lowers fluid viscosity which reduces drag and improves efficiency ever so slightly.
Not true for the current Allison. In 2011 they lowered the line pressure which resulted in significantly lower temps. I have yet to see mine even approach 200* pulling hills
Oct-23-2014 08:57 AM
carringb wrote:
The newer transmissions are designed to run hotter, as this lowers fluid viscosity which reduces drag and improves efficiency ever so slightly.
Oct-23-2014 06:13 AM
Oct-22-2014 09:56 PM
Oct-22-2014 08:14 PM
Oct-22-2014 07:51 PM
Oct-22-2014 07:49 PM
Oct-22-2014 05:21 PM
wintersun wrote:
The flash point of ATF is over 300 degrees and that is when you need to be concerned. If I am towing up a grade at elevation I expect to see a higher ATF temperature but as soon as I start down the other side the temperature starts to drop and continues to drop as I drive.
Oct-22-2014 04:24 PM
Oct-22-2014 03:21 PM