Rear differntial code? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

philvaught · 01-22-2012, 08:45 PM

Can anyone decode this rear end?

HB 03 29 W2

Thanks!

**JQ-72** · 01-22-2012, 11:48 PM

The HB is 3.08 ratio. Not sure about the other characters.

JQ

philvaught · 01-23-2012, 11:55 AM

Thanks!

How can I find out what the other codes mean?

bollybib · 01-23-2012, 12:30 PM

Info from p. 85 Chevrolet Truck Parts Catalog for 1946-1972 Series 10-30, September 1972

The four digit number following the type designation will designate the calendar month and date produced.

So 03 29 is March 29.

Plant designation is to be stamped immediately following the production date. "B" Buffalo Plant, "G" Gear and Axle Plant, and "W" Warren Plant.

So the W is for Warren Plant, 1 for first shift.

Seems like there should be a year designation somewhere but I can't find any info on that . Maybe the last two digits are week of month and year, but that's just a guess. My '69 has code JU 09 28 G2 (4.10 no posi, September 28, Gear and Axle Plant, 2nd shift).

Ozark Tim · 01-23-2012, 04:36 PM

1st shift at the plant on that date.

bollybib · 01-23-2012, 05:07 PM

Quote:

Originally Posted by Ozark Tim

1st shift at the plant on that date.

So noted.

philvaught · 01-23-2012, 10:30 PM

Thanks!

How do you know if it is posi or open?
Which code is that?

01-22-2012, 08:45 PM	#1
philvaught Registered User Join Date: Oct 2005 Location: Hendersonville, Tennessee Posts: 11	Rear differntial code? Can anyone decode this rear end? HB 03 29 W2 Thanks!

01-22-2012, 11:48 PM	#2
JQ-72 Senior Member Join Date: Feb 2001 Location: Killen, Alabama USA Posts: 3,629	Re: Rear differntial code? The HB is 3.08 ratio. Not sure about the other characters. JQ __________________ 72 Cheyenne Super swb. Factory 402/400,tach,posi,AM/FM, A/C. Adding cruise, 8-track 72 Cheyenne Super swb. 350/350 A/C, bucket seats 72 Cheyenne swb. Factory 402/400, tilt, posi, A/C 72 Cheyenne Super K-10. 350/4 spd., posi. 72 Suburban 350/350 tilt, tach, AM/FM, A/C, luggage rack 72 GMC Sierra lwb. 350/350, A/C. medium green/olive interior

01-23-2012, 11:55 AM	#3
philvaught Registered User Join Date: Oct 2005 Location: Hendersonville, Tennessee Posts: 11	Re: Rear differntial code? Thanks! How can I find out what the other codes mean?

01-23-2012, 12:30 PM	#4
bollybib Registered User Join Date: Nov 2010 Location: Carlsbad, CA Posts: 1,584	Re: Rear differntial code? Info from p. 85 Chevrolet Truck Parts Catalog for 1946-1972 Series 10-30, September 1972 The four digit number following the type designation will designate the calendar month and date produced. So 03 29 is March 29. Plant designation is to be stamped immediately following the production date. "B" Buffalo Plant, "G" Gear and Axle Plant, and "W" Warren Plant. So the W is for Warren Plant, 1 for first shift. Seems like there should be a year designation somewhere but I can't find any info on that . Maybe the last two digits are week of month and year, but that's just a guess. My '69 has code JU 09 28 G2 (4.10 no posi, September 28, Gear and Axle Plant, 2nd shift). __________________ - Jim - My Daily Driver is a 1969 Chevrolet Custom/20 Fleetside 350/TH400/Eaton H052 4.10 and its Project thread is here http://67-72chevytrucks.com/vboard/s...d.php?t=456911 Last edited by bollybib; 01-23-2012 at 05:08 PM.

01-23-2012, 04:36 PM	#5
Ozark Tim Registered User Join Date: Aug 2004 Location: Oakville, MO Posts: 1,018	Re: Rear differntial code? 1st shift at the plant on that date.

01-23-2012, 10:30 PM	#7
philvaught Registered User Join Date: Oct 2005 Location: Hendersonville, Tennessee Posts: 11	Re: Rear differntial code? Thanks! How do you know if it is posi or open? Which code is that?

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