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-   -   truck 12 bolt rear diff question (https://67-72chevytrucks.com/vboard/showthread.php?t=581621)

moregrip 05-24-2013 07:42 PM

truck 12 bolt rear diff question
 
How strong are they? I've been spoiled for too long with the larger FF 10.5" 14bolts and have no idea how tough the truck 12 bolts are.

Any help is greatly appreciated:flag:

74 stepside 05-24-2013 08:09 PM

Re: truck 12 bolt rear diff question
 
They are strong enough that GM put them behind all the factory Big Blocks, like SS Chevelles, Camaros, and trucks. The weakest part is the C- clips. Get C- clip eliminators to help resolve that weakness.

moregrip 05-24-2013 08:25 PM

Re: truck 12 bolt rear diff question
 
Quote:

Originally Posted by 74 stepside (Post 6088791)
They are strong enough that GM put them behind all the factory Big Blocks, like SS Chevelles, Camaros, and trucks. The weakest part is the C- clips. Get C- clip eliminators to help resolve that weakness.

c-clip eliminator; check. are the car and truck 12 bolts the same?

74 stepside 05-24-2013 08:27 PM

Re: truck 12 bolt rear diff question
 
They are a little different, but are all the same size. 8.75" The 10 bolts are 8.5" and 7.5"

mgchevyparts 05-24-2013 11:41 PM

Re: truck 12 bolt rear diff question
 
Ring gear the same but I think the pinion is smaller diameter on the truck 12 bolt. They are not interchangeable on the internals.

69GMC910 05-25-2013 12:43 AM

Re: truck 12 bolt rear diff question
 
I heard the truck 10bolt pinion is actually stronger than the truck 12 bolt pinion. That being said, there are people in the 9's with truck 12 bolts...
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