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Old 02-24-2017, 12:08 AM   #1
61ShortboxDave
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Can anyone tell me what my rearend came from?

I was able to read the following off the rearend in my 61.

3856525. GM3. HE1 14W

Can anyone tell me what this came from? It doesn't appear to be original to the truck.

Any help is appreciated.

Thanks for your time, Dave
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Old 02-24-2017, 12:14 AM   #2
Softpatch
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Re: Can anyone tell me what my rearend came from?

Pictures would be really helpful in helping you identifie what type.
Should be a tag secured to a bolt on the front pumpkin
usually on the pass side
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Old 02-24-2017, 12:29 AM   #3
62stepside longbox
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Re: Can anyone tell me what my rearend came from?

If it looks like this then it's an eaton ho32, original for a 60-62 1/2 ton truck
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Old 02-24-2017, 12:37 AM   #4
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Re: Can anyone tell me what my rearend came from?

he HE was used on both the '61 R10 and '65 C15. You need to determine whether you have a Eaton HO32 diff as shown above or a truck 12 bolt.

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Old 02-24-2017, 08:52 AM   #5
61ShortboxDave
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Re: Can anyone tell me what my rearend came from?

Yes, it is a 12 bolt, not the Eaton.
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Old 02-24-2017, 12:53 PM   #6
61ShortboxDave
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Re: Can anyone tell me what my rearend came from?

Here's a couple of pic's.
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Old 02-24-2017, 08:26 PM   #7
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Re: Can anyone tell me what my rearend came from?

I looks like 64 and up 12bolt for trailing arms. That is going by the track bar mount hole on the top right of the housing. Overall pics may help us till you what may have been to it during the swap into your truck.
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Old 02-27-2017, 01:50 PM   #8
61ShortboxDave
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Re: Can anyone tell me what my rearend came from?

Thanks very much for all the info !

Dave
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Old 03-01-2017, 04:48 PM   #9
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Re: Can anyone tell me what my rearend came from?

Just finished putting my brakes on that same rear end today, only chose the Wilwood because the kit had a parking break.

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