Hi there ... hoping you all can help me out.
I have a 2006 Dodge Grand Caravan SE 3.3L with 90k miles on it.
I have done regular transmission pan and filter changes at 30k, 45k, and 60k with Ultra Black silicone and have had no leaks before this. However, since dropping and reinstalling the pan this time around at 90k, it's leaking out the rear (bottom) side of the pan, and I don't understand why.
Here is what I have done so far (at 90k miles):
1. Dropped the pan, removed the filter, and left to drip overnight
2. Used a wire wheel to remove all gasket material from pan and bottom of tranny. Left lots of very small scratches from the wires, and the black finish on the pan is completely gone, replaced by a very shiny steel surface with lots of tiny scratches (but no large gouges that I believe would cause leaks), and I've done this every time before.
3. Cleaned pan and transmission mating surfaces with WD-40, but can't remember if I did this before or not.
4. Applied 1/8" of Ultra Black to pan (yes, inside bolt holes), waited 15min for tackiness, and then stuck on pan.
5. Tightened bolts down a little more than finger tight, waited 1 hour, then torqued to 14 ft-lbs.
I'm thinking it might be one of two things: (1) my repeated wire brushing of the pan may have compromised its ability to seal, or (2) that the WD-40 must be preventing the Ultra Black from sealing correctly, as I read on another forum that you should only use brake cleaner to clean the mating surfaces.
What do you guys think??