4. We ordered a TJM Pro Locker for our existing gear ratio of 3.73:1. Of course, soon after that we decided to take the opportunity of a diff change to swap the front and rear axle gear ratios to 4.10:1 since this particular vehicle runs 35-inch tires. We made a call to West Coast Differentials to see what they had in stock, only to find out that the carrier split on a Dana 44 was not the same as a Dana 60 and instead between 3.73 and 3.92. “Not to worry,” they told us. It turns out that WCD has thick gearsets for guys like us who want to run a (numerically) higher gear ratio on a lower carrier. West Coast Diffs got us out two Sierra Gear 4.10:1 ring and pinion sets, along with two install kits to ensure that we didn’t have to try and reuse shims and bearings.