My question: at what mileage should I look at having the transmission flushed and fluid changed? I'm thinking 60,000 miles. At least our F150 Diesels dont have the muffler cross-over pipe to deal with like on the 5. I do not intend to wait until the 150,000 miles listed in the owner's manual. Holy crap What a PITA that is to change the transmission filter & fluid on what is Fords new 10R80 transmission on an F150. I expect to keep hauling the 5,800 pound load for the next couple of years (up to about 60,000 miles). Always well within the temperature rating except once in Wyoming hitting near the upper limit for about 30 seconds (let it cool down and moved on with it well within range). In the past 12 months I've pulled the trailer a little over 7,500 miles, often in the Rockies climbing steep grades at altitudes above 7,000 feet and occasionally above 10,000 feet. I pull a trailer that grosses out at about 5,800 pounds (truck has the 3.55 axle ratio and is rated to pull 7,800 per the manual). My owner's manual says change it at 150,000 (the manual says 60,000 for five speed - mine is the six speed). I've read the posts on changing the transmission fluid. My brother tells me hes never felt his truck shift so well and smooth as it does now with the Amsoil, and is even reporting about a mile per gallon increase in fuel mileage.įirstly, I love my 2011 5.0 liter F-150. I couldn't differentiate between the old oil pouring out into the bucket and the new oil, so basically when the bucket got to about 3/4 full, we put the hose back onto the transmission oil cooler and topped the pan off to the proper level. After bolting up the transmission pan to OEM torque specs, which I believe was around 10-12 ft lbs, I filled the pan up with new fluid through the dip stick hole until fluid was just starting to leak out several times, while having him start the engine and letting the old fluid dump into a 5 gallon bucket through the feed hose at the transmission oil cooler. I went down to Amsoil and purchased I believe 18 quarts of ATF and we did the whole job in under 3 hours taking our time. We knew he had a small leak for about a year but never got around to changing it, even though I had already purchased a new transmission filter and pan gasket for his truck that has been sitting in my garage during that time. To my surprise on a warm engine, there was no transmission fluid even registering on the short dip stick. Well in my case, we changed my brother's 2009 F150 5.4L Lariat with 68k miles on it because it was leaking transmission fluid through the gasket, and on his last oil change I figured out where and how to check the transmission fluid level.
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