Ford F-150 - 1997-2003 :: Auto Trans Fluid Change To Synthetic


Nov 14, 2013

The trans fluid appears to need to be changed. I do not know if it has been changed in the past as this 2001 F150 with a V6 truck is new to me and has 88K miles. I am wanting to drain the torque converter as well as drop the pan and change the filter. I am willing to take the risk of having to rebuild the transmission if the flush junks it up.

Three Questions:

1. Is there any issue with mixing the synthetic with ATF fluid as there would still be ATF in the cooler and other places unless I take it someplace and have it mechanically flushed?

2. Is there a way to determine if my 4R70W trans has a drain plug in the torque converter with out getting under there, looking thru the inspection port while some one is clicking the starter?

3. Is there any reason not to put a drain plug in the pan while it is uninstalled?

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Ford F-150 - 1997-2003 :: 4R70W Trans Fluid Leaking - Puddle Of Fluid Under The Truck

I have a 1997 Ford F-150 XLT 4x4 with the 4.6W and a 4R70W trans. For the past year is has been leaking trans fluid and has slowly got worse and worse. At first the truck would only leak at high speeds (when driving on the interstate for extended periods of time) and now It has gotten to the point where I am adding close to a quart of fluid a week. ( roughly about a quart every 300 miles!). I thought that it was the pan gasket leaking at first, so I flushed the trans fluid (dropped the pan and drained the TC and put on a new filter) put a new gasket on and torqued it all down and added some new Valvoline max life fluid. The first trip in the truck I noticed a puddle of fluid under the truck again.

The pan looked like it could have been a little warped, so I ordered a new pan and a new FoMoCo gasket (the one the came with the new filter was the cheap felt type). I thought I for sure had fixed the truck this time, but I drove it and once again it was still leaking. I checked all that I could before replacing the pan and gasket. I checked the trans cooler lines and fittings (no leaks) I pulled the inspection plug and it was dry (so I ruled out the front pump or TC leaking). The whole underside of the truck is covered with fluid so it is hard to pin point the leak, but most of the fluid drips down on the transmission cross member.

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Ford 7.3L Power Stroke (1999-2003) :: How Often Change Synthetic Oil

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My truck is my daily driver for work and such. Occasional 300 mile round trips to see family.

Last time I changed my oil was in June. And I've put about 6500 miles on it.

I run royal purple 15-40

I just not sure what to believe. Maybe someone has a link to an article ?

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How do I know which kind I have forsure? The truck was bought at a Ford dealer, but I never thought to look at it while I was there.=

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Ford F-150 - 1997-2003 :: Bucking And Jolting Like Bad Misfire / Smell Trans Fluid Being Heated Up

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Ford F-150 (2004-2008) :: Trans Fluid Change - How To Get To Converter Plug

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