is my transmission on the way out?
1999 F150, 5.4, 4sp tows fine I was driving without the trailer and noticed at around 45 mpt, it felt like I was under power for short moments, then off power for short moments, then under power...
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45mph sounds suspiciously like your torgue converter lockup is shifting in and out. If it were me I would completely drain, flush and replace transmission fluid and replace all filters to see if it goes away.
