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post #1 of (permalink) Old 11-10-2004, 10:10 PM
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gm 12 bolt

i hear all these bad things about big tires on a gm 10 blot axle. my 77 blazer has a dana 44 front and a gm 12 bolt rear, my question is how much better is the 12 bolt than the 10?
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post #2 of (permalink) Old 11-10-2004, 10:51 PM
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Re: gm 12 bolt

Everything is a little bigger except for the pinion bearings which are actually smaller.
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post #3 of (permalink) Old 11-10-2004, 11:05 PM
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Re: gm 12 bolt

70s - Early 80s 12 Bolt:

Number of cover bolts: 12
Number of axle splines: 30
Diameter of ring gear: 8.875"
Number of ring gear bolts: 12
Pinion Shaft Diameter: 1.438"
Pinion Splines : 30

Early 80s - Late 80s 10 Bolt:

Number of cover bolts: 10
Number of axle splines: 28
Diameter of ring gear: 8.5"
Number of ring gear bolts: 10
Pinion Shaft Diameter: 1.625"
Pinion Splines : 30

I got that from the tables @
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