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The Ford Super Duty with axle code 3L features a Limited Slip axle and 3.73 gears. To identify this axle, find the axle identification tag at the 12 o'clock position on the rear differential cover bolt. The gear ratio is indicated in the lower left-hand corner, such as "3.73." If the number includes an "L," like "3L08," it signifies a limited-slip axle. Check the front door on the driver's side for the same information. Look for the Truck Safety Compliance Certification Label near the door latch on the door pillar. In the box labeled "AXLE," find a two-digit code below the barcode. Match this code on the label to determine the rear axle ratio.
The 3L axle code on the Ford Super Duty indicates that it has a limited-slip differential.