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: 3 or 4 series Carrier for 12 Bolt,,,How to tell the diff. glamis44 Sep 20th, 06, 10:31 PM How can you tell the difference between a 3 and 4 series carrier visually. Any numbers or measurements....Also whats the diff between the car and truck 12 bolt....Thanks for the help.... 12 Bolt Posi Carrier big gear head Sep 21st, 06, 7:49 PM There is a casting number on the end of the Eaton posi. The 3 series is a EDB30140 and the 4 series is a EDB30174. The number is next to the bearing on the end opposite of the ring gear. The truck posi is weaker and has a different offset on the ring gear flange. | ||