When I first got the car a week ago everything was fine, I have a little grinding problem in third but not all the time and it's not too bad. But now whenever I start the car up, I have to force the stick into first or reverse and it stays that way for like 5 minutes then it gets easy again... What's the deal?

 

Time to replace tranny fluid.

 

Yup! Go with some Amsoil. You can buy it from dealers on here. Also try to let the car warm up for 5min before driving.

Saw you were in Chicago. Def. let the car warm up and get some heat in it before driving. Guarantee it'll make the difference.