Rear Axle Ratio Charts For 1967 - 1972 GM Trucks - Page 2 - The 1947 - Present Chevrolet & GMC Truck Message Board Network

JointTech · 11-19-2013, 06:37 PM

well since i dont see it yet. I can probably OCR these are convert them to text. Ill fiddle with it today.

JointTech · 11-19-2013, 06:41 PM

Well my OCR software is kind of crappy but it wont take to much to clean this up. You guys prefer csv, xls or just a text file. the coloms are never going to line up correctly in the forum so it should be a download of some kind.

Quote:

1967
C14 . (3.73 ratio). HA-MD
C14. (3.07 ratIo). HB
C14 Positraction t3.13 ratio) HC
C14 Overdrive (4.11 ratio) HD
610..... (3.36ratlo) HI
610 (3.73 ratio) (2900 lbs.) Hi -ME
610 (4.11 ratio) (2900 lbs.) HK -MG
610 (4.11 ratio) (2400 lbs.) HL -MF
G10 Positraction (3.36 ratIo) HM-MH
GlO Positraction (3.T3 rallo) HN -MJ
610 Positractlon (4.11 ratio) (2900 lbs.) HO -MK
610 Positraction (4.11 ratIo) (2400 lbs.) HP-Ml
1(10 (3.13 rallo) HQ
PlO (4.11 rallo) HR
P10...., Posltraction (3.73 rallo) HS
PlO (3.l3ratio) HT
C20 (4.57 ratio) HU
C20 Positraction (451 ratio) HV
CZO (4.11 ratio) (Z9OU lbs.) HW
C20 (4.Slratio)DuaI Wheels HX
C20 Positraction Dual Wheels (451 ratio) HY
1(20 (45lratig) HZ-ND
P20 (4.5lratlo) IA
P20 Positraction (4.57 ratio) IB
C30 (4.57 ratIo) LW-MC-MW-MY
C30..... (5.14 ratIo) UJ -MO
C30 (Sl4ratio) IC-MR
C30 Dual Wheels (5.14 ratio). ID-MS-MV
C30 Dual Wheels (5.14 ratio) LV
C30 Positraction (5.14 rIo) lE-MO-MT
C30 Dual Wtieels, Positraction (5.14 ratio) IF -MU
P30 (5.I4ratlo) 1G
P30 Dual Wheels (5.14 ratIo) 1H
P30. . ... Posltraction 5.14 ratIo) II
C30 (4.5lratlo) iN
dO Positractlon (4.11 ratIo) JQ
C20 wP’327” (4.57 ratio) JS
C20 wr’32r, dual wheels (451 rallo) JI
C20 wP’327” (4.11 ratio) (2900 lbs.) JLJ
C30 (4.57ratio) MP
C30 (&lTrallo) MX
P20 (4.llratio) MZ
P30 (4.llratlo) NA—NB
P30 (4. ratio) NC
P30 (6.llratio) NE

67chevy1series · 11-19-2013, 10:51 PM

For 67 is c14 3.73 positraction the equivalent to a 67 c10 with 3.73 posi?

FreeRangeChicken · 11-20-2013, 09:40 PM

Here's another resource for differential (and engine, and VIN) codes.

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

JDSurge · 07-21-2018, 11:41 AM

Thanks guys for showing the axle charts. My Blazer was a RAW, so 3:73 is the axle ratio but what about the numbers stamped to the right of the RAW? Mine is W (then what looks like the upper part of a '3' ) 47
So W 347 ?
Thanks.

**davischevy** · 11-26-2019, 09:41 PM

Here is the stamp on my rear axle. RAY for 3.07 open. I'm going to guess it was built on the 251st day of the year, 1st shift.

**LockDoc** · 11-26-2019, 09:48 PM

Quote:

Originally Posted by davischevy

Here is the stamp on my rear axle. RAY for 3.07 open. I'm going to guess it was built on the 251st day of the year, 1st shift.

Larry,

I always thought it would be the 25 day of the 1st month. Don't know for sure.

LockDoc

**davischevy** · 11-26-2019, 09:58 PM

Where is Keith Seymore when we need him?

**70cst** · 06-08-2021, 12:01 PM

Great info ... Thanks

62k10&84k20burb · 11-20-2013, 08:22 PM

Ok, according to this, 1967 c20 duallys do exist?

Jake1971 · 03-16-2014, 04:34 PM

Subscribed, good info here

chuckmc8 · 03-17-2014, 07:20 AM

Thanks for posting this Leon. I need this info from time to time and always had to look for it. Is there a 1971 page like the 1972 chart in post #2? I just need the 5 lug stuff....

**LockDoc** · 03-17-2014, 10:52 PM

Quote:

Originally Posted by chuckmc8

Thanks for posting this Leon. I need this info from time to time and always had to look for it. Is there a 1971 page like the 1972 chart in post #2? I just need the 5 lug stuff....

The '71 chart is at the bottom of post #1. Is that what you need?

LockDoc

chuckmc8 · 03-18-2014, 05:48 AM

"The '71 chart is at the bottom of post #1. Is that what you need?"

Yes, that's it and I just missed it. Thanks!

Elefuntman · 03-25-2014, 05:09 PM

Is there any other places to look for the codes? I have a 69 C10, on the passenger side axle tube: "R V 0630 W2", and under that an "E", I do not see any code like it, does anyone know what ratio it is? Thanks

**LockDoc** · 03-25-2014, 08:51 PM

Quote:

Originally Posted by Elefuntman

Is there any other places to look for the codes? I have a 69 C10, on the passenger side axle tube: "R V 0630 W2", and under that an "E", I do not see any code like it, does anyone know what ratio it is? Thanks

Did you look in the location pictured in post #19?

LockDoc

Elefuntman · 03-26-2014, 09:09 AM

I will try there, from reading the posts I thought you guys were talking about a "K" series Dana. Thanks!

88Stanger · 08-01-2015, 12:47 AM

thank you!!!

**LockDoc** · 08-01-2015, 10:20 AM

Quote:

Originally Posted by 88Stanger

thank you!!!

No problem, glad folks are getting some use out of the info....

LockDoc

chefk85 · 08-01-2015, 05:53 PM

Great post! lots of good info here. the trouble I'm having is I cannot find my code! it reads as follows and I am not mistaken. TAY W175 2. will post pics if it becomes necessary but theres a good chance I'm missing it somewhere amongst all the darn codes. Any ideas?

thanks in advance,
chefk85

chefk85 · 08-01-2015, 06:22 PM

here is a pic(if I loaded it right) of the code TAY W175 2 pass. side near the top by brake tee.

**LockDoc** · 08-01-2015, 11:29 PM

Quote:

Originally Posted by chefk85

here is a pic(if I loaded it right) of the code TAY W175 2 pass. side near the top by brake tee.

Always a chance one was omitted in the charts or a housing got stamped wrong. If you take the cover off please post up the numbers on the ring gear so there is a record of it in the thread.

Thanks,
LockDoc

the idiocracy · 07-06-2016, 09:31 PM

I don't know what the C14 is about, but I just looked at my 1967 C10 pickup and there is an HA stamped clear as day on the top side of the passenger tube, pretty close the the pumpkin.

3.73. Super. I was really expecting to see something like a 5.10 or higher based on the fact that I am at 3000 rpms at 65mph.

I see a 3.23 rear gear in my future. Anyone know what diameter the ring gear is? I want to say 8.5", but I also know that GM did an 8.625" ring gear as well. Anyone know?

**LockDoc** · 07-06-2016, 10:05 PM

Quote:

Originally Posted by the idiocracy

I don't know what the C14 is about, but I just looked at my 1967 C10 pickup and there is an HA stamped clear as day on the top side of the passenger tube, pretty close the the pumpkin.

3.73. Super. I was really expecting to see something like a 5.10 or higher based on the fact that I am at 3000 rpms at 65mph.

I see a 3.23 rear gear in my future. Anyone know what diameter the ring gear is? I want to say 8.5", but I also know that GM did an 8.625" ring gear as well. Anyone know?

I always just figured the C14 was a misprint but I can't prove that one way or the other....

LockDoc

fist5366 · 11-27-2016, 04:46 AM

So is this out of a 70 with posi I was told it was out of a blazer with 3.73 gears. It was in the truck when I got it if I remember right we pulled and checked gears but that was 20 yrs ago . I'm sure they could have been changed at some point

11-19-2013, 10:51 PM	#3
67chevy1series Registered User Join Date: Mar 2010 Location: a t w a t e r cali 95301 Posts: 10,713	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks For 67 is c14 3.73 positraction the equivalent to a 67 c10 with 3.73 posi?

11-20-2013, 09:40 PM	#4
FreeRangeChicken Registered User Join Date: Nov 2013 Location: Erie, Colorado Posts: 19	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks Here's another resource for differential (and engine, and VIN) codes. http://www.gmcpauls.com/67-72_chevy.htm __________________ Dave L. 1967 Chevy C10 SWB Stepside, L6 250 1967 Chevy C10 Fleetside, LS2 6.0L 1972 Chevy C10 LWB Fleetside, 350

07-21-2018, 11:41 AM	#5
JDSurge Registered User Join Date: Oct 2014 Location: Lexington, Kentucky Posts: 67	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks Thanks guys for showing the axle charts. My Blazer was a RAW, so 3:73 is the axle ratio but what about the numbers stamped to the right of the RAW? Mine is W (then what looks like the upper part of a '3' ) 47 So W 347 ? Thanks. __________________

11-26-2019, 09:41 PM	#6
davischevy Senior Member Join Date: Sep 2008 Location: Harrison, Arkansas Posts: 9,834	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks Here is the stamp on my rear axle. RAY for 3.07 open. I'm going to guess it was built on the 251st day of the year, 1st shift. Attached Images __________________ other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless.

11-26-2019, 09:58 PM	#8
davischevy Senior Member Join Date: Sep 2008 Location: Harrison, Arkansas Posts: 9,834	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks Where is Keith Seymore when we need him? __________________ other Larry Build thread, Arkansas K10 https://67-72chevytrucks.com/vboard/...=755797&page=5 The ability to speak several languages is an asset, but the ability to keep your mouth shut in any language is priceless.

11-19-2013, 06:37 PM	#1
JointTech Registered User Join Date: Feb 2012 Location: Mission Viejo, CA Posts: 1,856	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks well since i dont see it yet. I can probably OCR these are convert them to text. Ill fiddle with it today. __________________ 72 C20 Long Bed SB350 TH400 14 bolt rear end Extremely boring build thread

06-08-2021, 12:01 PM	#9
70cst Senior Member Join Date: Feb 2001 Location: New Madison, Ohio Posts: 21,373	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks Great info ... Thanks __________________ A husband can be right...or...A husband can be happy. 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder!

11-20-2013, 08:22 PM	#10
62k10&84k20burb Registered User Join Date: Apr 2013 Location: owls head, new york Posts: 81	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks Ok, according to this, 1967 c20 duallys do exist?

03-16-2014, 04:34 PM	#11
Jake1971 Registered User Join Date: Oct 2013 Location: Bonnerdale, AR Posts: 699	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks Subscribed, good info here __________________ 1971 Bone Stock C10 project "Jake" 1997 Sierra SLT factory short bed "Silver Bullet"

03-17-2014, 07:20 AM	#12
chuckmc8 It's alsways something..... Join Date: Nov 2008 Location: Douglasville GA Posts: 1,171	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks Thanks for posting this Leon. I need this info from time to time and always had to look for it. Is there a 1971 page like the 1972 chart in post #2? I just need the 5 lug stuff.... __________________ 1968 RS Camaro 'Vert Matching number 327 and M21 Muncie 1968 C10 Black with red interior and orig paint. 5.3 / 4l60e,3:73 POSI 17" Torq Thrusts 1968 CST 514 Red with black interior. Buddy Buckets, Factory A/C, PS, PB- 20" AR custom shop TT, 5.3 and 4l60e Last edited by chuckmc8; 03-17-2014 at 07:26 AM.

03-18-2014, 05:48 AM	#14
chuckmc8 It's alsways something..... Join Date: Nov 2008 Location: Douglasville GA Posts: 1,171	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks "The '71 chart is at the bottom of post #1. Is that what you need?" Yes, that's it and I just missed it. Thanks! __________________ 1968 RS Camaro 'Vert Matching number 327 and M21 Muncie 1968 C10 Black with red interior and orig paint. 5.3 / 4l60e,3:73 POSI 17" Torq Thrusts 1968 CST 514 Red with black interior. Buddy Buckets, Factory A/C, PS, PB- 20" AR custom shop TT, 5.3 and 4l60e

03-25-2014, 05:09 PM	#15
Elefuntman Registered User Join Date: Jan 2014 Location: Western man cave Posts: 14	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks Is there any other places to look for the codes? I have a 69 C10, on the passenger side axle tube: "R V 0630 W2", and under that an "E", I do not see any code like it, does anyone know what ratio it is? Thanks Attached Images

03-26-2014, 09:09 AM	#17
Elefuntman Registered User Join Date: Jan 2014 Location: Western man cave Posts: 14	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks I will try there, from reading the posts I thought you guys were talking about a "K" series Dana. Thanks!

08-01-2015, 12:47 AM	#18
88Stanger Registered User Join Date: Mar 2015 Location: Washington State Posts: 1,651	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks thank you!!!

08-01-2015, 05:53 PM	#20
chefk85 Registered User Join Date: Jun 2015 Location: Bellevue, Id Posts: 173	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks Great post! lots of good info here. the trouble I'm having is I cannot find my code! it reads as follows and I am not mistaken. TAY W175 2. will post pics if it becomes necessary but theres a good chance I'm missing it somewhere amongst all the darn codes. Any ideas? thanks in advance, chefk85



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08-01-2015, 06:22 PM	#21
chefk85 Registered User Join Date: Jun 2015 Location: Bellevue, Id Posts: 173	Rear Axle Ratio Charts For 1967 - 1972 GM Trucks here is a pic(if I loaded it right) of the code TAY W175 2 pass. side near the top by brake tee. Attached Images

07-06-2016, 09:31 PM	#23
the idiocracy Registered User Join Date: Jun 2016 Location: Davisburg, Michigan Posts: 54	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks I don't know what the C14 is about, but I just looked at my 1967 C10 pickup and there is an HA stamped clear as day on the top side of the passenger tube, pretty close the the pumpkin. 3.73. Super. I was really expecting to see something like a 5.10 or higher based on the fact that I am at 3000 rpms at 65mph. I see a 3.23 rear gear in my future. Anyone know what diameter the ring gear is? I want to say 8.5", but I also know that GM did an 8.625" ring gear as well. Anyone know?

11-27-2016, 04:46 AM	#25
fist5366 Registered User Join Date: Sep 2009 Location: Tucson , Az Posts: 89	Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks So is this out of a 70 with posi I was told it was out of a blazer with 3.73 gears. It was in the truck when I got it if I remember right we pulled and checked gears but that was 20 yrs ago . I'm sure they could have been changed at some point Attached Images

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