Thread: 99 f350 7.3l 4x4 rearend diff fluid
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Old 05-17-2011, 05:31 AM
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brian42
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The "L73" would indicate that you have a 3.73 Limited Slip differential in the rear.

IIRC my rear took just under 2 gallons (8 quarts) to fill from empty.
 
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