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Old 12-20-2009, 06:36 PM   #1
ol Curt
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66 c10 rear end id

Anybody know where to look for the ID on a 66 c10 rear end? I thought it would have a two letter designation. I see some series of numbers , but no letters.
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Old 12-20-2009, 09:41 PM   #2
jonzcustomshop
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Re: 66 c10 rear end id

I think it is the rh axle tube...
alans classic had a pic of one once..
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Old 12-20-2009, 11:15 PM   #3
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Re: 66 c10 rear end id

Man,
I was under there for awhile today looking for he letters on the axle tube. Anybody got a pic of where they are?
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The truck was his and he sure as heck wouldn't understand why I took a perfectly good truck and tore it down!
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Old 12-21-2009, 12:32 PM   #4
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Re: 66 c10 rear end id

Bueller?
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The truck was his and he sure as heck wouldn't understand why I took a perfectly good truck and tore it down!
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Old 12-21-2009, 12:55 PM   #5
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Re: 66 c10 rear end id

Ok,
I'm not home so that I can look, but I found this and thought I would pas it on for others who might be looking. I may have to use the wire wheel near this location.
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1966 Chevy C10 Longbed
I'm Bob....ol Curt was my Grandpa
The truck was his and he sure as heck wouldn't understand why I took a perfectly good truck and tore it down!
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Old 12-21-2009, 10:24 PM   #6
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Re: 66 c10 rear end id

Ahhh yes, that is what i was looking for! I though when I had the other six in my truck with headers, cam and dual carbs I laid rubber with both tires. The HA designation indicates a 3.73 Positrac
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1966 Chevy C10 Longbed
I'm Bob....ol Curt was my Grandpa
The truck was his and he sure as heck wouldn't understand why I took a perfectly good truck and tore it down!
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Old 12-22-2009, 12:05 AM   #7
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Re: 66 c10 rear end id

The HA is the gear code which is a 3.73.........I Don't think it has anything to do with positraction
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Old 12-22-2009, 12:21 AM   #8
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Re: 66 c10 rear end id

I need to go back and look at it closer. For a c15, which is a 1/2 ton, 127" wheelbase I should either have a HF(3.73 excl. posi), HG (3.73 with posi), or a HH (4.11 overdrive). Obviously I don't have the latter.

That is of course, assuming the factory assembly manual is correct.

If all else fails, I'll go pull the cover...or lay some more rubber!!
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1966 Chevy C10 Longbed
I'm Bob....ol Curt was my Grandpa
The truck was his and he sure as heck wouldn't understand why I took a perfectly good truck and tore it down!

Last edited by ol Curt; 12-22-2009 at 12:29 AM.
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