Hi I just bought a 1998 Mark VIII LSC two days ago. I have a few questions. 1) My rear taillight does not have the LSC badging. It states Lincoln. I am 100% sure the car is an authentic LSC. I have paperwork from the original owner, VIN, dual exhaust, perforated seats, etc. I thought all LSC had that particular emblem? 2) I am swapping to a Traction-Lok rear end and want to install 4.10 gears. I have read that the car would need a tune. What all would that entail as I am unfamiliar with modding computer cars (parts, price, etc)? 3)Would I be better served to just install 3.73 gears? Thanks very much.