So... I bought a new Slash 4x4 in December. It ran great, but the addiction set in and I started upgrading parts to improve handling. I recently installed the Traxxas LCG Chassis (same as the Ultimate) and the Center Differential. The project is not finished because of a "clicking" sound in the front diff when you push it across the floor. The clicking is there with or without the front 1/3 of the truck installed. I've read numerous threads, searched Google and You Tube. Everyone says the diff is in a bind and I agree. If I loosen the front bumper, the long screw that secures the hinge pins and the two 4x12 screws, it smooths out. I've tried tightening each screw down bit by bit to isolate problem, but with no results. All of the screws have to be fairly loose for the binding to cease. Any thoughts, advice or insight would be GREATLY APPRECIATED.