Register or Log In To remove these advertisements. |
|
|
|
Thread Tools | Display Modes |
11-27-2016, 08:03 PM | #51 | |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,624
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
Quote:
LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
|
11-27-2016, 08:52 PM | #52 |
Registered User
Join Date: May 2016
Location: Henderson NC
Posts: 975
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
The rear isn't in my truck but it turns one axle opposite of the other. I know it's an open rear now and I have been looking at an Eaton Truetrac. I plan to put the open rear in for now and to rebuild the one I'm taking out latter.
|
11-28-2016, 12:51 AM | #53 |
Registered User
Join Date: Sep 2009
Location: Tucson , Az
Posts: 89
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
This might be a stupid question be where exactly do measure from to compare to the stock rear end . I can find a width online and I tried to measure but it's a pain cause it's in the truck.
|
11-28-2016, 12:56 AM | #54 | |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,624
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
Quote:
I believe it is from flanges where backing plates bolt on. It can be tough when they are still in the truck.... LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
|
11-28-2016, 02:36 AM | #55 |
Registered User
Join Date: Sep 2009
Location: Tucson , Az
Posts: 89
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
Thanks I'm just trying to figure out what it's out of. It seems wide but when I measured today it was pretty close to 60" which makes me wonder why it seems so tight. I was told it was out of a 76 blazer but now I have no clue, it is 6 lug
|
02-13-2017, 01:39 PM | #56 |
Registered User
Join Date: Jun 2015
Location: Rock Hill, SC
Posts: 37
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
If the truck has posi-traction, would it most likely be listed as an option on the SPID?
|
02-14-2017, 08:17 PM | #57 | |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,624
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
Quote:
Sorry, I missed this somehow.... Normally they would be an option and listed on the SPID, unless it was added later by someone. The posi rears also had a plastic tag on the fill plug with instructions to use positraction fluid in them. That could be missing though. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
|
02-14-2017, 08:29 PM | #58 | |
Registered User
Join Date: Jun 2015
Location: Rock Hill, SC
Posts: 37
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
Quote:
Thats what I thought...wishful thinking I guess. Thanks, |
|
07-21-2018, 11:41 AM | #59 |
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 | #60 |
Senior Member
Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,833
|
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.
__________________
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, 09:48 PM | #61 | |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,624
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
Quote:
Larry, I always thought it would be the 25 day of the 1st month. Don't know for sure. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
|
11-26-2019, 09:58 PM | #62 |
Senior Member
Join Date: Sep 2008
Location: Harrison, Arkansas
Posts: 9,833
|
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. |
11-26-2019, 11:19 PM | #63 |
Registered User
Join Date: Nov 2018
Location: Flowery Branch, GA
Posts: 206
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
Having a RAY code, that's a 1972 KE 10 3.07 open rear end. There's a letter in front of the 251. It's very faint, and looks like a W, which would mean it was built in Warren, MI. 251 would be September 7th (the Julian date, which is the day of the year), and the 1 is the 1st shift.
__________________
1970 C10 LWB Stepside 1971 Dodge Dart 1993 Buick Roadmaster Estate Wagon |
04-21-2021, 09:35 PM | #64 |
Registered User
Join Date: Feb 2018
Location: Amarillo Texas
Posts: 12
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
My 67 gmc starts with a HA
Posted via Mobile Device |
04-21-2021, 10:47 PM | #65 |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,624
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
That would be the 3.73 ratio non-posi then. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
06-08-2021, 06:23 AM | #66 |
Registered User
Join Date: Dec 2012
Location: Vancouver, Washington
Posts: 1,644
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
Interesting and helpful thread. I'm currently having the rearend in my '68 rebuilt due to many many issues of wear and the cross pin bolt was broken and barely hanging on. I have not sought out the stamped code on the axle housing, but It does have a 3.07, open carrier in it. Along the ring gear are the numbers to confirm the ration, as well as "72" stamped on it. Would this indicate gear possibly transplanted from a 72?
__________________
1968 Chevrolet C/10 LWB - 327, TH350 - 4/5 Drop |
06-08-2021, 09:23 AM | #67 |
The Older Generation
Join Date: Aug 2006
Location: Montezuma, Iowa
Posts: 25,624
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
-
I don't think they were date coded but I'm not 100% sure about that. LockDoc
__________________
Leon Locksmith, Specializing In Antique Trucks, Automobiles, & Motorcycles (My Dually Pickup Project Thread) http://67-72chevytrucks.com/vboard/s...d.php?t=829820 - |
06-08-2021, 12:01 PM | #68 |
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! |
08-31-2022, 03:42 PM | #69 | |
Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,413
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
Quote:
__________________
Every 25 years I like to rebuild that 292, whether it needs it or not. |
|
08-31-2022, 07:33 PM | #70 |
Senior Member
Join Date: Nov 2015
Location: Pine City MN
Posts: 357
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
Very good info
Subscribed
__________________
72 C10, Was a 350,M20, Brodix heads,Comp cam, Edelbrock intake&carb, Hedman hedders LWB. Project is now a 5.3(L33) w/PRC stage 2.5 CNC ported 243heads, BTR RedHot cam,Holley Terminator X, T56 magnum. SWB, Boyd tank. 4.5/4 Drop http://67-72chevytrucks.com/vboard/s...My72c10project |
09-01-2022, 10:16 AM | #71 |
Registered User
Join Date: Feb 2007
Location: west coast
Posts: 3,380
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
The charts do indicate what GM offered, but, GM could have offered more ratios to fill the bill more precisely. We had to wait for the square body years for the 3.42 ratio for C 10's and the 3.73 ratio for C 20's.
|
09-01-2022, 05:35 PM | #72 |
Senior Member
Join Date: Feb 2002
Location: Tucson, AZ USA
Posts: 7,413
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
I ran the numbers on 2 differentials I have.
One, [TPF 1204w] which I had on my '68 C/10 Stepside, but was damaged in a side impact collision, I thought we pulled off a '69 GMC shortbed fleetside. It had been under my Stepside since the Mid '80s. 3.73 Eaton posi. Chart says 1970, not '69, but who can tell the years by looking at a GMC? The diff I replaced it with [HR 0316w] is [going by the charts] off a '67 P/10 4.11 open. It was a longbed because the 5' handbrake cables didn't work on my 115'' wheelbase C/10. The guy who sold it to me said it came off a '65 or '66 truck. I had it rebuilt with new axles, bearings and 3.73 gears. Still breaking it in.
__________________
Every 25 years I like to rebuild that 292, whether it needs it or not. |
09-01-2022, 06:01 PM | #73 |
Senior Member
Join Date: Jan 2005
Location: CA
Posts: 5,737
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
The rear end that was in my truck when I bought it was one of the wider units from a 1970. It had 1970 written on it in yellow paint marker, probably from a wrecking yard. It also measured at the wider width found on 70-72 rear ends. Code stamped on the top of the passenger side axle tube was TDA 11 06 W2, which translates to 1970 3.73 built November 6th. There was also a date code cast into the differential housing that read J 31 9 which translates to October (J) 31st, 1969, which would be appropriate for an early-built 1970 model year.
|
09-01-2022, 06:15 PM | #74 |
Senior Member
Join Date: Jan 2005
Location: CA
Posts: 5,737
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
I purchased a replacement rear end that had the following codes:
HA 05 06 W = 1967-69 3.73 May 6th D 17 8 = April 17th, 1968 The odd thing is that I pulled it out of a 1967 Suburban. I'm guessing it wasn't the original rear end though due to the date code on the differential casting. The cool thing is that it is a reasonable date for my '68 truck that was built in the summer of '68. |
09-02-2022, 07:57 PM | #75 |
Not a bad nut after all..
Join Date: Dec 2000
Location: ND
Posts: 1,756
|
Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
I have a 1970 leaf-spring 6-lug 3:07 posi, which is "TPO 0422". I decode this as:
What is the meaning of CA vs CE? At first I thought it might be leaf spring rear suspension vs. coil spring rear suspension, but I see the same with K-series so this is ruled out.
__________________
'05 Chevy 2500HD 4x4 '72 GMC LWB 4x2 driver '72 Chevy LWB 4x4 plow truck '71 Blazer 4x4 driver '70 GMC LWB trailer |
Bookmarks |
|
|