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Old 12-22-2010, 12:17 AM   #1
qu1cks1lver56
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Are 10 bolts 8.5 30 spline?

I'm looking for a posi unit, and someone said they have one for a 10 bolt 8.5 30 spline they'd let me have for cheap. My truck has a stock 10 bolt in it, would this work for me?
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Old 12-22-2010, 12:39 AM   #2
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Re: Are 10 bolts 8.5 30 spline?

some are 28 some are 30 I think depends on the year. i would get it and change out the axels to 30-spline axels. stronger imo. dont quote me tho lol

Last edited by nbpro; 12-22-2010 at 12:42 AM.
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Old 12-22-2010, 01:17 AM   #3
qu1cks1lver56
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Re: Are 10 bolts 8.5 30 spline?

Any way to tell if you have 28 or 30?
My truck's an 86 that came stock with a 305. Probably 28 spline being my luck.
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Old 12-22-2010, 01:20 AM   #4
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Re: Are 10 bolts 8.5 30 spline?

I believe the 30 spline started in 88 with the new body style
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Old 12-22-2010, 01:26 AM   #5
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Re: Are 10 bolts 8.5 30 spline?

28 spline carried into the early part of the '89 production year then they switched to 30 spline.dont quote me tho lol

Last edited by nbpro; 12-22-2010 at 01:28 AM.
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Old 12-22-2010, 03:58 AM   #6
rayfinseats
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Re: Are 10 bolts 8.5 30 spline?

"
'88 and older 8.5" 10 Bolts including some early '89s have 28 spline axles. "

Last edited by rayfinseats; 12-22-2010 at 03:58 AM.
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Old 12-22-2010, 09:50 PM   #7
qu1cks1lver56
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Re: Are 10 bolts 8.5 30 spline?

Thanks.
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Old 12-22-2010, 10:22 PM   #8
cor86
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Re: Are 10 bolts 8.5 30 spline?

2WD=28 spline, except on the 88-98 trucks. 4WD were 30 spline and 6 lug, except the 10 bolt front, which is also a 28 spline.
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Old 12-22-2010, 10:40 PM   #9
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Re: Are 10 bolts 8.5 30 spline?

remember suburbans and blazers has the same 10 bolts up till 1992
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Old 12-22-2010, 11:28 PM   #10
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Re: Are 10 bolts 8.5 30 spline?

are 2wd suburbans what most look for when trying to find a posi unit or more desireable gear?
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