I just noticed this today after starting up my truck that the gear shifter just slides through the gears, not stopping and engaging like it should. I have a 2004 4x4 Lariat Supercrew.
Yesterday when driving I was doing 75 and moved it into 2nd gear, the rpm's immediately shot up ( I didn't notice how high) so I immediately moved it back to Drive. I drove my truck for a while after that, putting it in park, drive and reverse several times with no problems, but today it won't engage in any gear.
Heres a video. Maybe you guys know what the problem is.