Vin # help

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May 22, 2016 | 09:37 AM

dsmit412

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Joined: Apr 2015

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Vin # help

Does anyone know if you can tell what rear end gear size you have by the Vin # ? Or does anyone know what gear they would put behind a 1981 f150 straight six C6 automatic ?

May 22, 2016 | 10:03 AM

DeereFord300

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Joined: Nov 2013

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From: Maryland

Not by the VIN, but the certification tag should have an area that says "axle". If there is a number there, you have an open differential, if there's a number/letter code you have a limit slip diff. By using this site created by one of our members you can decipher it.

Axle Ratios - ??Gary's Garagemahal

May 22, 2016 | 12:51 PM

NumberDummy

Ford Parts Specialist

Joined: Nov 2006

Posts: 88,826

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From: Simi Valley, CA

Quote:

Originally Posted by DeereFord300

Not by the VIN, but the certification tag should have an area that says "AXLE"

If two numbers, you have an open differential, if there's a letter/number code you have a limited slip diff.

1959 thru today: If the AXLE code begins with a letter = Limited Slip, if with a number, no Limited Slip.