The purpose in driving the vehicle 20 miles is to warm the Tranny up. I either drive mine or let it sit and idle for about 15-20 min.'s then shift thru the gears manually then check with the tranny warm. As stated by Mark you can't check trans fluid cold. If the level doesn't touch the the stick with a warm tranny and in park I would say you need fluid and wonder why and where it's going. Probably a seal.
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Transmission fluid is checked warm with it idling in Park.
Well, this is true in my other vehicles, but the dipstick on my 2005 F150 5.4L seems to indicate something else. Near the bottom, it says "Cold," then there's a line across the stick. there's a crosshatch above the line, then another line. Nothing else is printed on the stick.
I need to check the level, but this is confusing. Does this mean to check the fluid cold, with the vehicle idling in park?
Just wanted to add that the dipstick in my truck does not look like the one in the owner's manual. The manual shows a large crosshatch area near the bottom with the word "COLD" in it. Then there's another large crosshatch area above that with the work "HOT" in it. Mine doesn't look like that at all; there's only one crosshatch area, it's small (about 1/2" long), and it doesn't have anything printed in it.
I looked at the dipstick again this morning, just because I was so annoyed. There's writing on the upper part of the stick that I had totally overlooked. It clearly states to check the fluid hot, with the tranny in Park, and not to add fluid if the level is in the crosshatch area. Doh!
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