More Gear Problems

[Pwnzor1130]

Hey guys! I'm having more gear problems . My car is not going in reverse and if i try for too long then it won't go forward either. To temporarily solve it I have to manually turn the wheels. apparently the main gear is not meshing with the diff correctly. Could I solve it myself or should I get new gears? I can't really tell which are bad. If i have to I will get new main and pinion gears (just in case, I could be wrong) along with a new diff. I will get the new diff anyway because I can't really control my car well with a locked rear diff. It slides way too much.