I have a 2007 Chrysler Aspen it was working perfectly fine until I changed the a.c. compressor ( which by the way did not even work) after changing the a.c. compressor I tried to drive my Chrysler, it started fine, shirts in all gears jus fine but it's jus not moving at all

 

Is the 4WD selector maybe positioned in Neutral and not in 2WD or 4WD?

 

Also jus after changing the compressor the svc 4wd light came on that never happened before

 

Not that familiar with the system used on yours, but YES sounds like something got jarred or damaged on the 4WD electronic component for 4WD during the A/C work. The interior control may show in a drive mode, but the transmission/transfer case may be stuck in neutral. Would be wise to find your owners book and check fuses for one that may have "blown".