I'm trying to gather a shopping list of parts for a rear end upgrade for my 2011 GT (Automatic). It currently has the stock 3.15:1 gears & differential. so far on my list I have - Aluminum One Piece Driveshaft - FR500S Differential - Ford Racing 3.73:1 gears - Rear gear pinion bearing for 2010+ but I'm not sure which installation kit to get - Rear End Installation Kit - 8.8in - Rear End Installation and Bearing Kit - 8.8in I'm thinking that since I'm getting the rear gear pinion bearing separately, that there isn't any reason to get the more expensive installation kit. Am I missing anything? Also, with the Torsen differential, am I correct in assuming that I'll never need to get the TracLOK Rebuild Kit. From what I've read I think it's a helical gear and doesn't have any clutches to wear out.