Dodge Ram

How can I tell what style or model no. Of automatic transmission I have. I need to change the fluid and filter but when I look online for these items it would seem that there are quite a few different models being used. I have a 1999 dodge ram 1500 p/u truck 4x4 regular cab it is an aut transmission with over drive the over drive button is on the gear shift.
April 17, 2006.

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