I have a 99 Ford F-150 4.2 extended cab, the forward gears in the trans went out, it would move but barely! I pulled pan it was filthy and had a lot debris, so I found a different trans from a 2000 Ford F-150 4.2. I replaced the trans and changed fluids and filter, the insides looked good, with very lil black dust. Put it all together, filled it up, let it warm up, absolutely nothing happens, doesn’t even feel like it’s getting power at all! Does anybody have any clue what could be causing this to happen?