How do I know if I have limited slip

2012 FORD F-150
95,000 MILES • 3.7L • V6 • 2WD • AUTOMATIC
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BIGKAHUNAKEITH
  • MEMBER
  • 2 POSTS
Adding rear diff. fluid.
Aug 5, 2025 at 6:06 AM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,837 POSTS
  • ASE Certified Mechanic
Open the driver’s side door, find the "Axle" code.

H9 Limited Slip (LS) 3.55
L9 Limited Slip 3.73
B6 Open Differential 3.73
15 Open Differential 3.15
27 Limited Slip 3.31

Motorcraft SAE 75W-85 Premium Synthetic Hypoid Gear Lubricant

Part Number: XL-2

Capacity: Approximately 2.75-3.25 quarts, depending on the axle (8.8" - 9.75")

It is okay to ad locking differential fluid to a non locker FYI.
Aug 5, 2025 at 6:15 PM
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