Reverse slider cab be flipped, save a buck there unless someone beat you to it. The correct answer to the 5/6 driven gear is to have TX Drivetrain Performance repair yours or buy a new one. How does the gear itself look? Do you have the T56 pdf? It's a Google away and has your bearing preload specs in addition to feeler gauge air gap specs for your syncros. Basically, it needs to sit so far away from the gear it's resting on. That tells you how much friction material is left. And don't forget billet chromoly keys! I'd get the keys from Ampd Motorsports as they're the cheapest. Stay away from Tick/the gearbox/Hawks keys. They're all the same and they're all steaming hot garbage billet dogshiit. I've not heard of the Viper 2nd gear, but make sure you grab a steel 3-4 fork. The aluminum ones fail when you shift like a man.