2006 F150 Transmission problem?
 

I have a 2006 F150 4x4 with the small block V8. It has an automatic transmission with the push-button overdrive button in the end of the shifter. 130,000 miles.

Driving uphill, it has developed a loud clatter. It's not quite a grinding sound and not quite a rattle. I believe it's in the transmission, but I'm not sure.

EDIT: After reading the forums, it appears that this is the IWE Solenoid.