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Old 04-15-2007, 11:21 AM   #1
70GMCer
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12 Bolt Posi ?

Is a 12 bolt posi unit/carrier for a our trucks the same as a 12 bolt posi/carrier for a car?
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Old 04-15-2007, 11:36 AM   #2
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Re: 12 Bolt Posi ?

No it isn't, the car has a bigger pinion shaft, and the housings are different.
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Old 04-15-2007, 12:31 PM   #3
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Re: 12 Bolt Posi ?

Not talking about the gears or housing........the posi carrier itself. A few people in the past have told me that they are the same. Just want to make sure of this on here.....
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Old 04-15-2007, 02:08 PM   #4
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Re: 12 Bolt Posi ?

No they are not the same. I just rebuilt the 12 bolt in my truck and needed a new carier . I got a new eaton .
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Old 04-15-2007, 02:11 PM   #5
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Re: 12 Bolt Posi ?

I am 99% sure that the carrier is different, just because everything else is different, the housing, gears, etc. Plus car and truck rears always have seperate listings for part numbers, etc.
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Old 04-15-2007, 05:42 PM   #6
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Re: 12 Bolt Posi ?

The differences are the pinion shaft diameter, 1.438" for a truck and 1.625" for a passenger car and the bolt patterns.
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Old 04-15-2007, 05:53 PM   #7
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Re: 12 Bolt Posi ?

Eaton 12-bolt Posi carrier:

The car version is one part number, the truck is a different part number entirely. Ring and pinion sets are entirely different too.
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