Real Diff questions!

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02-24-2012, 05:34 PM

ZachStack

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Real Diff questions!

I have the rear diff tag numbers.

S 909 A-1
55 9 75 803

does anyone know what they mean? im trying to figure out what gears are in the rear end of my F150

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02-24-2012, 05:45 PM

otto457

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Look on the door jamb sticker, it's easier to decode:

19 – 3.55 Non-LS
18 – 3.08 Non-LS
H9 – 3.55 LS
B6 – 3.73 LS

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02-24-2012, 06:12 PM

ZachStack

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i know that but my truck has had the rear end replaced...thats why i got the numbers off the rear axle.

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02-24-2012, 06:25 PM

otto457

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Ok. S909A-1 should be a 3.55 LS rear.

http://www.fordification.com/tech/rearends_ford15.htm

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02-24-2012, 06:34 PM

A7X

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There should be a "3" before that ".55" on the tag haha

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02-24-2012, 06:46 PM

ZachStack

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there might have been but it has been painted a few times. but thanks guys!

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