My insurance company wouldn't take my ex off of my policy until I faxed them a copy of my divorce decree. Wasn't about to ask my ex to provide his insurance information. Didn't need to, he no longer lived in the house.

As for you taking the truck off of the insurance, you may want to hope that the truck was repossessed, because if your ex gets into an at-fault accident and there is no insurance, you are just as liable as he is. It really wasn't a smart move to allow the insurance to expire until after the divorce is final, he was awarded possession of the truck as part of his assets AND your name was taken off of the title.