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  #1  
Old July 27th, 2020, 03:59 AM
Rustbucket Rustbucket is offline
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Default Part number help?

Does anyone have a late 60's parts book? I'm trying to ID part number 3896851 (might also be 3898851). I checked my 1960 book but the number doesn't exist yet.. Thanks in advance.
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  #2  
Old July 27th, 2020, 04:39 PM
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Default Re: Part number help?

What is it? A casting number? A block? Cummins flywheel housing is all I can find.

Last edited by AZKen; July 27th, 2020 at 06:57 PM.
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Old July 27th, 2020, 09:04 PM
Rustbucket Rustbucket is offline
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Default Re: Part number help?

Looks like an engine bracket. Here's a pic.
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Old July 27th, 2020, 10:03 PM
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Default Re: Part number help?

That's an A/C compressor/ engine mounting bracket.
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File Type: jpg 1969-GMC-Truck-Speed-Sports v6 engine bay air conditioning ac bracket.jpg (294.8 KB, Multiple views, 12 clicks)
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Old July 27th, 2020, 10:45 PM
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Default Re: Part number help?

Thanks Funky, do you know what year they started using that? I've seen a couple of factory 1966 A/C trucks and they don't have that bracket.
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Old July 27th, 2020, 11:39 PM
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Default Re: Part number help?

I have one that I bought that was listed as a 67-72 application; assuming you had GMC V6 after 1969.

I have seen the 1966 variant with the Harrison style compressor, but it's mounted on the driver side high up.

The bracket you posted also incorporates the alternator too. It's a pretty sturdy unit.
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Last edited by Funky61; July 27th, 2020 at 11:45 PM.
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Old July 27th, 2020, 11:51 PM
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Default Re: Part number help?

Just for reference here is the 1966 unit you're speaking about.

This photo I borrowed thanks to GMCNUT's Original and highly optioned Fantastic Suburban Carryall on the forum elsewhere.
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File Type: jpg AC compressor brackets 1966 GMC V6.jpg (580.0 KB, Multiple views, 9 clicks)
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Old July 28th, 2020, 02:41 AM
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Default Re: Part number help?

Seems to be a 60's AC bracket
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Old July 30th, 2020, 11:33 PM
Rustbucket Rustbucket is offline
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Default Re: Part number help?

Thanks Funky, that's the earlier one I was thinking of. I like the later one better; the early one looks homemade even though it's factory (a series of plates and brackets vs. a single cast piece). I guess GMC was improvising at first until they came up with a "normal" one..
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Old July 30th, 2020, 11:34 PM
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Default Re: Part number help?

Hi Ken yes I got it, was trying to verify what it was first. Good eyes!
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