545rfe trans low pressure
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Go under your rig and check the two cooler lines from the trans all the way to the radiator. If you had a leak you would know it though? Shift your dak into N while running and check your trans fluid. If its low that could be your problem. I dont know much about the 545rfe?? but if its anything like the 46RE the cooler lines should go from the drivers side of the trans to the radiator or aux cooler.