I know this is a pretty stupid question. I would just spin the tires in my yard, but the house if for sale and I need to keep it tidy.

any tricks to be certiain the 4wd is working? I put it in low and drove on the driveway, but still wasn't sure. It def felt different driving, but I need to be sure 'cause I am heading to the beach again Sat. I believe I will be able to take it to the shop, but I wanted to check with you guys first...