How do I know if I have limited slip

Tiny
BIGKAHUNAKEITH
  • MEMBER
  • 2012 FORD F-150
  • 3.7L
  • V6
  • 2WD
  • AUTOMATIC
  • 95,000 MILES
Adding rear diff. Fluid.
Tuesday, August 5th, 2025 AT 6:06 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 54,137 POSTS
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.
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Tuesday, August 5th, 2025 AT 6:15 PM

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