I'm pretty good with tuning other parts but I came across a tune for my corvette ZR1 that beats "like the wind" events it involves transmission/gear tuning... But I don't understand what people mean when they say set it too 249 or w/e. The tune I found says" trans gearing 261" I can't tune individual gears and can't set final drive ratio to the number 261. What does this mean and how do I set it? Thanks for any help