External ATF Filter I think?

I have a leak in what I think is an external ATF filter. I think thats what it is. Facing the grill it is on the left hand side of the radiator. It's about 4-5 inches in height and red. It has a hose coming out of the rad. into the top of it and another leading to the tranny. I don't know what its called to fix it or locate another. please help. Let me know if you need a picture of it and i'll post one. Thanks Jed

It's probably a transmission cooler. You do have an automatic tranny, right.
 
A picture speaks a thousand words......

Yup it's an auto. I looked for trans coolers on NAPA, Kragen, Auto Zone, etc., but to no avail. I'll post some pics this weekend.

Its a tranny cooler, if its red its more then likely not stock.  

It is red. Where abouts would i find a replacement?

Take measurements of the physical size and go to your local Auto parts store and tell them the size you have then buy one, I recomend a plate and fin design they tend to cool better...but cost a little more...some even have a temperature bypass for quicker tranny warmup...