Alright. Topped off the 1999 Ford Expedition Eddie Bauer 5.4L Triton with one quart ATF yesterday. I noticed the trans felt unusually hot. Not abnormal, being behind engine and all, but the fluid sure looks dirty. 155,000 miles and likely never been serviced, as I dont remember it being done. Now, usually, I see if I can get the siphon pump hose down the fill neck, hot, and replace equal amount of fluid as removed. This partial mixing ensures that I dont shock a healthy trans to death, old wives tale as that may be, it may not "supposed" to happen but IIRC, it does - sometimes.
Any pros and cons to changing fluid this way.
I selected Supertech HM that replaces Mercon fluids, red quart trans fluid for the top-off. Also asking if I should change that out, one gallon at a time, neck hot method.
Any pros and cons to changing fluid this way.
I selected Supertech HM that replaces Mercon fluids, red quart trans fluid for the top-off. Also asking if I should change that out, one gallon at a time, neck hot method.