olds 12 bolt identification help !!

Old March 30th, 2019, 04:36 PM
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olds 12 bolt axle identification help !!

Hi, ive been trying to identify the 2 axles that came out of a 1969 olds 442 391 12 bolt posi, cant really find anything, is there a site i can go to that will tell me what these are, i put some pics here so you guys can see them, there both 28 spline but the numbers are different ?? one is 907 o55 with the letters AD the other is 605 o50 with the letter H ?? thanks for looking and thanks for those who respond !! john...


Last edited by john mann; March 31st, 2019 at 09:19 AM. Reason: needed to add axle
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Old March 30th, 2019, 07:22 PM
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If they came out of a type O rear end than their Oldsmobile axles. Olds is the only one who used the Type O rear ends. I don't know why they have different numbers, but if they're both 28 spline they must be from a 1969 or 1970. The 1967 and 68 3.91 gears used 31 spline axles. If this doesn't answer your question then please add more to your post so we know exactly what your looking for. John
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Old March 30th, 2019, 08:11 PM
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I haven't ever paid attention to the shaft numbers so I can't help with that. Do you know what rear these came out of?

Originally Posted by 2blu442 View Post
if they're both 28 spline they must be from a 1969 or 1970.
All year O-Types had 28 spline axle shafts, the rears with under 3.42 ratio were standard duty (as opposed to heavy duty) and used 28 spline axle shafts. 1970 was different as all ratios used 28 spline shaft axles.

Last edited by Fun71; March 30th, 2019 at 08:15 PM.
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Old March 30th, 2019, 08:21 PM
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The O axle used two different bearings and seals through its short run, And I think the vista wagons had an even larger axle shaft diameter and thus different bearing ID. If they were my axles, I would want to measure the axle surface where it rides on the bearing...and see if that dimension leads to possible answers.

Are the old bearings and seals laying around near by....?

This page at super cars unlimited is worth the read if you haven't seen it.


https://www.supercarsunlimited.com/i...id/diff_id.htm
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Old March 30th, 2019, 08:45 PM
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Originally Posted by don71 View Post
The O axle used two different bearings and seals through its short run
Yes, the 67-69 rears used sealed bearings with an oil seal pressed into the end of the axle tube. The 1970 version used an open taper bearing with the oil seal sandwiched between the bearing and the axle retainer flange, same as the 71-up corporate 10 bolt rears.
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Old March 30th, 2019, 08:48 PM
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i talked with Greg at super cars, with my casting number's on the differential which is 402227 and my axle bearings he sold me i have the 28 spline 1967-69 12 bolt o type, these bearings were cut off so i can put the new ones on he sold me..


es on he sold me,

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Old March 30th, 2019, 09:13 PM
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Yep, that is the early style (67-69) sealed bearing.
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Old March 30th, 2019, 09:49 PM
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All year O-Types had 28 spline axle shafts,
'67-68 were 31 spline, '69-'70 were 28 spline with better metallurgy. Did I miss something here? Or am I mis-reading what you are saying?
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Old March 31st, 2019, 04:13 AM
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12 Bolt O Axle CARRIER CASTING NUMBERS (O.E. ANTI-SPIN CARRIERS) Casting Number Year Ratio (673 1970 2.56-2.78 28 spline axles) (671 1970 3.08-3.23 28 spline axles) (588 1967-1970 3.42-5.00 28 spline axles) (672 1967-1968 3.42-5.00 31 spline axles) i got this from supercars site hopefully this will help, john...

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Old March 31st, 2019, 09:01 AM
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I have the 442 By The Numbers book, but it isn't as detailed as the site.
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Old March 31st, 2019, 10:32 AM
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Originally Posted by 1969w3155 View Post
'67-68 were 31 spline, '69-'70 were 28 spline with better metallurgy. Did I miss something here? Or am I mis-reading what you are saying?
What I'm saying is there were 28 spline shafts in all years of production. Only the 3.42-up rears in 1967-1968 had 31 spline shafts. The 3.23-down rears had 28 spline shafts.
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Old March 31st, 2019, 09:51 PM
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Gotcha, thanks.
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Old April 1st, 2019, 11:38 AM
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OK gang, i got the scoop on the axle # numbers, i called Greg from supercars unlimited, he told me those numbers are just foundry # numbers like where they were made etc etc, even day shift or evening shift, he said as long as they measure correctly and have the correct number of splines your in business, even though mine or 2 different numbers he said that still could happen but it is a 50 year old rear end and somebody along the line could have changed one, so that's the scoop !! john....
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