Engine locking up??

Yeah, I did that. Since you mention that, I just drained the oil back out. I was going to unbuckle the motor mounts, lift the engine and drop the steering to see if I can get the oil pan off. I'm still looking at it. I'm so far along that it may be easier just to lift the engine out.

If that's not the problem, I'm stumped!

Easier to pull the engine and trans in one whack. Put front tires on the ground and jack up the rear as high as possible and pull both together. Fix your issue, bolt up the trans and drop it back in.... in one whack. Less time on your back and it is easy to fix everything together while both engine and trans are out.