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Old 11-03-2024, 01:29 PM   #1
data89
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Question Trouble finding correct pinion seal

'69 C10 step side, 12 bolt, stock truck. 8 seals to choose for my truck from Oreilly's. So far I've chosen the wrong one. What do I need to know to get the right seal other then taking the old seal for comparison and ordering all the available seals? Also what's the difference between HO and HA? I've seen HO to be for 3/4 and 1 ton trucks, yet the HO seals look like they would be the right dimensions. Axle says HO 0325.

Last edited by data89; 11-03-2024 at 06:42 PM.
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Old 11-03-2024, 07:24 PM   #2
JDL
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Re: Trouble finding correct pinion seal

I just did this one yesterday Precision Differential Pinion Seal - 8460N
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Old 11-03-2024, 09:33 PM   #3
data89
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Re: Trouble finding correct pinion seal

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Originally Posted by JDL View Post
I just did this one yesterday Precision Differential Pinion Seal - 8460N
Great to know JDL. Finally that's exactly what I've finally arrived at. Thanks.
By the way, can you also tell me what the number on my axle means as far as gear ratio? It's stamped HO 0325. I know, I know, it's a dumb question for those who know.
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Old 11-03-2024, 10:51 PM   #4
uncle
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Re: Trouble finding correct pinion seal

The book I have shows HO to be a 4:11 posi traction.
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Old 11-04-2024, 09:46 PM   #5
data89
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Re: Trouble finding correct pinion seal

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The book I have shows HO to be a 4:11 posi traction.
Great, thanks for the confirmation, that was what I came up with finally.
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