I am swapping in a new Tremec Magnum XL into my 07 and would like to sell my stock Tr6060. It has a little over 40k miles on it and I suspect it needs a rebuild as you could feel a little something off while coasting at very slow speeds. A local speed shop looked at it and they think I caught it early and it probably has a bearing going out but we drained the fluid in it and it came out red and clean with no metallic. I don't want to store it and would like to sell it. What should I ask for it?