C20 Axle Decoding - The 1947 - Present Chevrolet & GMC Truck Message Board Network

nolimitssjca · 02-26-2014, 02:58 PM

Hi,

I am trying to decode the axle from a donor C20. But I can't find any sites or references in any search that show the codes.

I understand the middle 4 digits are Month and Day, but I can't decode the prefix or suffix.

Can anyone share a web reference or at least help decode what I have?

ID: THU 0305 G1

nolimitssjca · 03-25-2014, 06:03 AM

Found it! Axle codes are at the bottom.

http://www.gmcpauls.com/67-72_chevy.htm

The HU is a 4.57

SS Tim · 03-25-2014, 06:47 AM

Guess you hit a limit there.

While HU is correct for a C20 4.57 axle it is a 67 code,
The code as a whole breaks down as below. A 67 would not have the "T" prefix.
BTW: The factory parts manual is a good place to look for application codes.

T Truck
HU 4.10 open 1970 CA20
03 March
05 5th day of March
G Chevrolet Gear and Axle plant
1 1st night shift (IIRC)

nolimitssjca · 03-28-2014, 04:03 AM

Thanks for the decode Tim. What manual did you get this from?

SS Tim · 03-28-2014, 04:31 AM

Like I said a factory parts manual P&A 72TL.
But I also crossed checked it to a dealer informtion bulletin for 1970.

02-26-2014, 02:58 PM	#1
nolimitssjca Registered User Join Date: Apr 2012 Location: San Jose, CA Posts: 69	C20 Axle Decoding Hi, I am trying to decode the axle from a donor C20. But I can't find any sites or references in any search that show the codes. I understand the middle 4 digits are Month and Day, but I can't decode the prefix or suffix. Can anyone share a web reference or at least help decode what I have? ID: THU 0305 G1

03-25-2014, 06:03 AM	#2
nolimitssjca Registered User Join Date: Apr 2012 Location: San Jose, CA Posts: 69	Re: C20 Axle Decoding Found it! Axle codes are at the bottom. http://www.gmcpauls.com/67-72_chevy.htm The HU is a 4.57

03-25-2014, 06:47 AM	#3
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: C20 Axle Decoding Guess you hit a limit there. While HU is correct for a C20 4.57 axle it is a 67 code, The code as a whole breaks down as below. A 67 would not have the "T" prefix. BTW: The factory parts manual is a good place to look for application codes. T Truck HU 4.10 open 1970 CA20 03 March 05 5th day of March G Chevrolet Gear and Axle plant 1 1st night shift (IIRC) __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban Last edited by SS Tim; 03-25-2014 at 07:06 AM.

03-28-2014, 04:03 AM	#4
nolimitssjca Registered User Join Date: Apr 2012 Location: San Jose, CA Posts: 69	Re: C20 Axle Decoding Thanks for the decode Tim. What manual did you get this from?

03-28-2014, 04:31 AM	#5
SS Tim Registered User Join Date: Aug 2010 Location: Edwards, CA Posts: 7,503	Re: C20 Axle Decoding Like I said a factory parts manual P&A 72TL. But I also crossed checked it to a dealer informtion bulletin for 1970. Attached Images __________________ Thanks, Tim * VIN/Model Decoders * Power Team Charts (engine/transmission/gear ratio) * Post Your Pickup SPID Blazer SPID Suburban/Panel SPID * RTFM ... Read The Factory Manuals... download 'em here Highlanders Do you have a 1972 Plaid Pickup? Plaid Blazer ** Plaid Suburban



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