I have a '97 F150 with an auto tranny, with the 3.55 limited slip. It came stock with 235/70/r16 tires. I am going to be putting 265/75/r16 tires on. Which VSS gear will I need to order to correct my speedometer. I have gone out to the website posted throughout this forum that calculates which gear it thinks I may need but it came back that I would need the 18 (gray) gear, but I have seen posts on here that say I would instead need a 19 (tan) gear. I'm thinking I will need the 19 tooth gear but I just wanted to double check here to make sure before I try ordering one. Thanks!