1955 Bel-Air differential ID numbers? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 08-26-2012, 02:55 PM
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1955 Bel-Air differential ID numbers?

I have a rear end with this #A210 3725899 Gm-16. I would like to know if anyone knows what these numbers tell me about my rear-end.

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Old 08-26-2012, 03:02 PM
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I edited the thread title so the membership has an idea what your specific question on the 55 Bel Aire is

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Old 08-29-2012, 07:54 AM
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Those are only Casting ID numbers, they wont give you the Ratio or Carrier type.
Differentials: GM 55P - Drop out style rear end with no removable pinion support. Uses bolt in axles. Has 8.2 ring gear. Ring Gear Bolts: (10) 3 8 x 24 RH

Look on the passenger side axle Tube for stamped numbers. Wire brush or wheel will come in handy.
General # location Pic >> Reference Manual: Chapter 3: Axles: Factory Useage
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