OK-Heres my question. I have two gear boxes off of late 70 early 80 chebbies. I had just bought a new box for my 87 ram charger but I do believe it is bad. Taking it back is not an option. Looking at the boxes side to side they look identical in all aspects BUT is there a difference. Everything is new and tight on the RC but it still feels like I am riding on marshmellows going down the road-Any advice on the gear boxes?