As mentioned in an earlier Post, purchased a 2005 Viper - Found the Rear end to have blown pinion and Spider gears. There have been many posts about this, it is a weak link in these cars. JonB has a used one (Hydra-Lock) for sale, $895, no guarantees but it has been gone through , all appears to be in good working order, clean, and the car can be back on the road - (If I can find an exhaust!) . Wavetrac is not available until the middle of December according to the manufacturer, some folks, like JonB think it will be next March or April. If I purchase the Hydra-Lock from JonB, and then can find the Wavetrac sometime within the next year or so, is there even a market for that Hydra-Lock if it survives until I get the Wavetrac ? I guess I should ask JonB if he will purchase it back, if all is in good shape. Plus you have the labor to swap out again. I guess I need to check on that as well. But are there people out there with a lot of miles on their Hydra-Lock rear ends, and is there even a market for a used on in good shape ? Thanks for reading this - I hope it makes sense .