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Old 06-16-2009, 02:47 PM
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12 Bolt Pinion Seal

I am having a hard time finding the correct pinion seal for my 12 bolt. I believe the rear end is out of a 1966 Impala. All the parts stores and dealers are coming up with the same seal. Proper O.D. but a smaller I.D. The yoke has the inside clips. Thanks for reading.

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Old 06-16-2009, 03:08 PM
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Sounds like someone has replaced the rear end yoke with one from an 8.5" Corporate 10-bolt. the spline is the same but the area that rides on the seal is just a hair bigger than the 12-bolt seal. The 10-bolt seal won't work because the o.d. of the seal won't fit the bore of the housing, The only way to find the correct seal is to look it up using the dimensional table in the seal catalog.

I'm assuming that the rear end yoke has no tabs to center the joint when bolting together? The 12-bolt yoke would have the locating tabs

When you say inside clips, I am assuming you mean the u-joint cup has a groove for a c-clip that goes OVER the u-joint cup and inboard of the yoke ears? and not the clip at the end of the u-joint cup inside the yoke ear cap bore.
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Old 06-16-2009, 03:35 PM
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I was thinking the same thing, but today I picked up a 2nd rear end and the yoke is the same.
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Old 06-16-2009, 03:42 PM
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Have your parts store look at a National # 8622
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Old 06-16-2009, 03:52 PM
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Normal 12 bolt seal is #8460N ID 1.739 OD 2.812
8622 seal is 1.94 ID 2.813 OD.

12 bolts normally didn't come with the 3R series Joints using the inside snap rings.
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Old 06-16-2009, 06:53 PM
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I will try them in the A.M.
Thank You'
Night Rider
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Old 06-17-2009, 09:45 AM
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Got it. Thanks alot prostreet6t9.
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Old 06-17-2009, 01:16 PM
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Originally Posted by night rider
Got it. Thanks alot prostreet6t9.
You're Welcome!
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