I am nearing 30k and going to change my trans filter this weekend. I have searched on here and looked in the tech folder and can't find anything about it. My biggest question is how much fluid am I going to lose when I do this? Is the whole thing gonna drain or will I just lose whats in the filter housing? I ordered my filters from Diesel Filters Online, great price and fast shipping...

 

External transmission fluid filter change:

Filter # 3C3Z-7B155-BA OR FT-145

This job requires a 22 mm wrench OR socket (it helps a lot to use an impact wrench, otherwise you get a fair amount of movement and stress on the lines).

You will only lose the amount in the filter housing.

Here is a previous thread on it -

<TABLE style="WIDTH: 634pt; BORDER-COLLAPSE: collapse" cellSpacing=0 cellPadding=0 width=845 border=0 x:str><COLGROUP><COL style="WIDTH: 634pt; mso-width-source: userset; mso-width-alt: 30902" width=845><TBODY><TR style="HEIGHT: 12.75pt" height=17><TD class=xl24 style="BORDER-RIGHT: #d4d0c8; BORDER-TOP: #d4d0c8; BORDER-LEFT: #d4d0c8; WIDTH: 634pt; BORDER-BOTTOM: #d4d0c8; HEIGHT: 12.75pt; BACKGROUND-COLOR: #ffcc99" width=845 height=17>https://www.ford-trucks.com/forums/734984-05-external-tranny-filter-removal-install.html#post6076066</TD></TR></TBODY></TABLE>


Note - you can re-use the o-ring since tranny fluid is not hard on the rubber (like diesel is). I like to change the o-ring personally. Depending on where you get the filter, you may or may not get a new o-ring. Be sure to ask.

Oring #: 3C3Z 7J126 AA

If you wipe down the inside of the housing, be careful there could be some sharp edges.

Edit note: Russ stated 22 mm (I changed mine to be consistent with his post).

 

Thanks, wonder how I missed it...