Since i replaced my tailgate a while back i always noticed the rear window doesnt operate smoothly going up and down. I cant seem to figure out why my best guess would be the arms on the regulator since my vehicle was in a accident anybody have any ideas on what else could cause this?

 

Missing teeth on the elec motor?

 

Sticky tracks/guides? About $5 for a can of "Liquid Wrench Silicone Spray."

 

I'd try what Scope said first. My driver side door inner parts all work much better than the passenger.. since I removed the door panel and cleaned and greased everything. Including locking cylinder. Big difference.

 

Yes like ^^^, inspect and lubricate