Trans fluid and filter replace - causing all kinds of problems! HELP!

[BustedKnuckles]

So I just did a round of maintenance on my 07' X5 4.8L... Engine oil, coolant, brake pads, AND... transmission fluid and filter...

Car jacked up in the air on jack stands and perfectly level front to back, side to side...


Removed the splash shield

drained transmission fluid through plastic drain bolt

removed the old filter

followed the instructions on the new filter, put some fluid on the o-ring on the filler neck. carefully placed the new filter back onto the bottom of the trans and hand tightened the bolts.

Went in the proper sequence of tightening the bolts until everything was fully re-assembled.

using a fluid pump, I used ZF lifeguard fluid until it started to overflow from the fill hole.

tightened the fill bolt. put the wheels back on, dropped her back onto the ground and started her up. Runs fine.

THE PROBLEM - when I put the car in reverse to back it out of the garage, it sits for a second and puts itself back in park. Tried again, happened again...

Try a 3rd time and it stays in reverse.. hmm ok... start to back out of my garage and all of a sudden i hear a loud fast clicking noise. like really loud... like metal smacking together. and the car puts itself back in park. I shut it off.

At this point i"m getting on here to figure out what I F'd up... please give me good news...

UPDATE: Just tried to back it down the driveway again and got to the end of the driveway and reverse isnt working... It's still in reverse but gassing it just revs the engine... WTF... put it back in drive and it goes up the driveway fine but then acts like it slipping as I pull it in the garage.. How did I just destroy my transmission by changing the filter and fluid?