Do these numbers mean anything? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

manimal · 03-11-2014, 05:38 PM

These are stamped on the passenger side axle tube of my 14blt rear axle.....do they mean anything?

manimal · 03-11-2014, 05:38 PM

looks to me like "R F K G1572"

Keith Seymore · 03-12-2014, 09:28 AM

Yes - typically they are codes for the ratio, locking vs open, and the manufacturing date code.

Unfortunately I do not have a secret decoder ring so I can't interpret it. I suspect someone on this site does.

K

manimal · 03-12-2014, 10:23 PM

Thanks Keith.... I was hoping YOU would know....

83GMCK2500 · 03-12-2014, 11:02 PM

Someone (or someones) has a book on this, we just had a thread about 12 bolt stampings.

GM72K10 · 03-13-2014, 03:29 PM

Any idea what year?

Theoriginalsilverado · 03-13-2014, 04:02 PM

That's so funny I literally just took this picture to ask you guys what it means.

My trucks a 1975 C20, Camper Special. Not sure about the rear end I was hoping this # could give me some information?

THE CODE IS:
KJN G3231

kjc292 · 03-14-2014, 04:45 AM

a couple ideas. one a person that cant align anything...

also where it was made, bolt pattern and then possibly productionnumber.... not necessarily all there but probably just location and number...

GM72K10 · 03-14-2014, 01:11 PM

Quote:

Originally Posted by Theoriginalsilverado

That's so funny I literally just took this picture to ask you guys what it means.

My trucks a 1975 C20, Camper Special. Not sure about the rear end I was hoping this # could give me some information?

THE CODE IS:
KJN G3231

KJN, 1975 c20, 4.10 open

GM72K10 · 03-14-2014, 01:12 PM

Quote:

Originally Posted by manimal

These are stamped on the passenger side axle tube of my 14blt rear axle.....do they mean anything?

RFK 1976 C20, 4.10 open

GM72K10 · 03-14-2014, 01:13 PM

Quote:

Originally Posted by Keith Seymore

Yes - typically they are codes for the ratio, locking vs open, and the manufacturing date code.

Unfortunately I do not have a secret decoder ring so I can't interpret it. I suspect someone on this site does.

K

FYI, the codes are in the Factory GM Truck parts catalogs.

manimal · 03-14-2014, 03:28 PM

THANK YOU!...now where do I download a copy of the GM parts catalog!?

Theoriginalsilverado · 03-14-2014, 10:01 PM

Thanks so much guys!

**hatzie** · 03-15-2014, 01:03 PM

Quote:

Originally Posted by manimal

THANK YOU!...now where do I download a copy of the GM parts catalog!?

My scans are massive PDF files...
Ian Harding hosted them for us along with a lot of other GM parts books here---->http://www.gmpartswiki.com/

GM72K10 · 03-15-2014, 01:13 PM

Yeah these are great.
http://www.gmpartswiki.com/getpage?pageid=54955 for 73-78
http://www.gmpartswiki.com/getpage?pageid=60411 73-78
http://www.gmpartswiki.com/getpage?pageid=57733 79-84
http://www.gmpartswiki.com/getpage?pageid=56090 85-91

Keith Seymore · 03-17-2014, 07:11 AM

Thanks guys.

I was just coming back here to report this (SSTim pointed the wiki out to me).

K

manimal · 03-20-2014, 06:20 PM

I just went through all that and could not find the codes. I have another one...RFH G2932.
Thank You

again, a 1977 C20

**hatzie** · 03-21-2014, 12:09 AM

73-78 Front and Rear Axle codes 1st page
79-84 Front Axle codes 1st page
79-84 Rear Axle codes 1st page
85-91 Front Axle codes 1st page
85-91 Rear Axle codes page 1

The Wiki has a search page...http://www.gmpartswiki.com/query

The parts books have engine, transmission, transfer case and other codes as well... Right along in the same group of pages.

GM72K10 · 03-21-2014, 05:53 AM

Quote:

Originally Posted by manimal

I just went through all that and could not find the codes. I have another one...RFH G2932.
Thank You

again, a 1977 C20

3.73 open but listed as a 76

03-11-2014, 05:38 PM	#1
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Do these numbers mean anything? These are stamped on the passenger side axle tube of my 14blt rear axle.....do they mean anything? Attached Images __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

03-11-2014, 05:38 PM	#2
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Do these numbers mean anything? looks to me like "R F K G1572" __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

03-12-2014, 09:28 AM	#3
Keith Seymore Registered User Join Date: May 2009 Location: Motor City Posts: 9,226	Re: Do these numbers mean anything? Yes - typically they are codes for the ratio, locking vs open, and the manufacturing date code. Unfortunately I do not have a secret decoder ring so I can't interpret it. I suspect someone on this site does. K __________________ Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/

03-12-2014, 10:23 PM	#4
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Do these numbers mean anything? Thanks Keith.... I was hoping YOU would know.... __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

03-12-2014, 11:02 PM	#5
83GMCK2500 Registered User Join Date: Sep 2009 Location: Beaverton, OR from WA State Posts: 1,515	Re: Do these numbers mean anything? Someone (or someones) has a book on this, we just had a thread about 12 bolt stampings. __________________ Devin 1983 GMC High Sierra 2500, 4x4, RC/LB, 400 S.B., SM-465, NP-208, Corporate 10 bolt & 9.5" 14 bolt 1996 GMC Sierra SLE 3500 DRW, 4x4, EC/LB, Vortec 454, NV-4500, BW-4401, AAM 925 & AAM 1050 1997 GMC Sierra SLT 1500 4x4, Z71/F44, EC/SB, Vortec 350 My Introduction with my '83s History New Daily, the '96

03-13-2014, 03:29 PM	#6
GM72K10 Next! Join Date: Jan 2003 Location: Eastern Pa. Posts: 2,483	Re: Do these numbers mean anything? Any idea what year? __________________ 86 K30 CUCV M1028A1 86 K30 CUCV M1028a2 dually 86 K30 C&C 6.2 4:56s, 4M, 11,000 gvw, ex fire truck, now lowboy dump More square bodies and CUCVs than I care to admit to 2020 Silverado K3500HD Work truck

03-13-2014, 04:02 PM	#7
Theoriginalsilverado Registered User Join Date: Nov 2013 Location: Norris Arm NL Posts: 126	Re: Do these numbers mean anything? That's so funny I literally just took this picture to ask you guys what it means. My trucks a 1975 C20, Camper Special. Not sure about the rear end I was hoping this # could give me some information? THE CODE IS: KJN G3231 __________________ If It runs like a Chevy, it probably is!

03-14-2014, 04:45 AM	#8
kjc292 Registered User Join Date: Jun 2013 Location: Oregon Posts: 89	Re: Do these numbers mean anything? a couple ideas. one a person that cant align anything... also where it was made, bolt pattern and then possibly productionnumber.... not necessarily all there but probably just location and number... __________________ 79' c20 std cab 292 3speed granny - daily driver. 77' c30 std cab 454 th400 4.10 - fathers truck then mine. 95' ford bronco 302 4speed overdrive. 2002 mustang auto v6 - girlfriends daily driver. Debt just means that you had more fun than you're suppose to have

03-14-2014, 03:28 PM	#12
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Do these numbers mean anything? THANK YOU!...now where do I download a copy of the GM parts catalog!? __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

03-14-2014, 10:01 PM	#13
Theoriginalsilverado Registered User Join Date: Nov 2013 Location: Norris Arm NL Posts: 126	Re: Do these numbers mean anything? Thanks so much guys! __________________ If It runs like a Chevy, it probably is!

03-15-2014, 01:13 PM	#15
GM72K10 Next! Join Date: Jan 2003 Location: Eastern Pa. Posts: 2,483	Re: Do these numbers mean anything? Yeah these are great. http://www.gmpartswiki.com/getpage?pageid=54955 for 73-78 http://www.gmpartswiki.com/getpage?pageid=60411 73-78 http://www.gmpartswiki.com/getpage?pageid=57733 79-84 http://www.gmpartswiki.com/getpage?pageid=56090 85-91 __________________ 86 K30 CUCV M1028A1 86 K30 CUCV M1028a2 dually 86 K30 C&C 6.2 4:56s, 4M, 11,000 gvw, ex fire truck, now lowboy dump More square bodies and CUCVs than I care to admit to 2020 Silverado K3500HD Work truck

03-17-2014, 07:11 AM	#16
Keith Seymore Registered User Join Date: May 2009 Location: Motor City Posts: 9,226	Re: Do these numbers mean anything? Thanks guys. I was just coming back here to report this (SSTim pointed the wiki out to me). K __________________ Chevrolet Flint Assembly 1979-1986 GM Full Size Truck Engineering 1986 - 2019 Intro from an Old Assembly Guy: http://67-72chevytrucks.com/vboard/s...d.php?t=342926 My Pontiac story: http://forums.maxperformanceinc.com/...d.php?t=560524 Chevelle intro: http://www.superchevy.com/features/s...hevy-chevelle/

03-20-2014, 06:20 PM	#17
manimal Registered User Join Date: Oct 2006 Location: Southern Kalifornia Posts: 3,066	Re: Do these numbers mean anything? I just went through all that and could not find the codes. I have another one...RFH G2932. Thank You again, a 1977 C20 __________________ ------------------------------------------------------ -Lance 2000 Chevy C2500, 5.7, 4L80e 1999 Suburban K2500, 7.4, 4L80e 1980 Camaro..son's car...PROJECT

03-21-2014, 12:09 AM	#18
hatzie Moderator Join Date: Oct 2008 Location: Wentworth, NH Posts: 4,977	Re: Do these numbers mean anything? 73-78 Front and Rear Axle codes 1st page 79-84 Front Axle codes 1st page 79-84 Rear Axle codes 1st page 85-91 Front Axle codes 1st page 85-91 Rear Axle codes page 1 The Wiki has a search page...http://www.gmpartswiki.com/query The parts books have engine, transmission, transfer case and other codes as well... Right along in the same group of pages. __________________ 1959 M35A2 LDT465-1D SOLD 1967 Dodge W200 B383, NP420/NP201 SOLD 1969 Dodge Polara 500 B383, A833 SOLD 1972 Ford F250 FE390, NP435/NP205 SOLD 1976 Chevy K20, 6.5L, NV4500/NP208 SOLD 1986 M1008 CUCV SOLD 2000 GMC C2500, TD6.5L, NV4500 2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263 2009 Impala SS LS4 V8 RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials... 1973-1991 GM Light Truck Service, Unit/Overhaul, Wiring Manuals, Parts Books and Some 1968-1999 GM Service Training textbooks in PDF 1988-1998 GMT400 CK service manual project 1988-1993 GMT400 CK parts books. 1967-1972 GM Light, Medium, & Heavy Truck Service Manuals in PDF Please include at least the year and model in your threads. It'll be easier to answer your questions. And please let us know if and how your repairs were successful. Last edited by hatzie; 03-21-2014 at 09:24 AM.

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