swapped out my differential this weekend, all went smooth....i think. replaced my stock 4.57 with an Eaton with 4.11 gears. It looked to be in great shape. The owner said he was just driving the truck last week that it came out of. The swap could not have been easier, slid right in. Berfore i put it in i chacked to make sure it was turning freely. After i put it in i slid the axle shafts back in and before i bolted them down i turned one and the yoke was turning as it should. Then i attached the drive shaft back and was then able to turn the axle shaft freely as before. That didn't seem right to me, is it? The truck was left in gear with the tires blocked. Could it be that i hadn't filled it with oil yet?

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