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Old 11-20-2013, 08:22 PM   #26
62k10&84k20burb
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

Ok, according to this, 1967 c20 duallys do exist?
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Old 11-20-2013, 09:40 PM   #27
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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
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Old 03-16-2014, 04:34 PM   #28
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

Subscribed, good info here
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Old 03-17-2014, 07:20 AM   #29
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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....
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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.
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Old 03-17-2014, 10:52 PM   #30
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

Quote:
Originally Posted by chuckmc8 View Post
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?

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Old 03-18-2014, 05:48 AM   #31
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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!
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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
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Old 03-25-2014, 05:09 PM   #32
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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
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Old 03-25-2014, 08:51 PM   #33
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

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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?

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Old 03-26-2014, 09:09 AM   #34
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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!
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Old 03-26-2014, 10:47 PM   #35
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

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Usually on the passengers side axle tube.

LockDoc
so judging by what you've posted for a picture the TDE would stand for 3.07:1 gears ina C10? What would the 11 and 13 stand for?
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Old 03-26-2014, 11:51 PM   #36
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

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so judging by what you've posted for a picture the TDE would stand for 3.07:1 gears ina C10? What would the 11 and 13 stand for?

That would be correct. I think that may be a date code ie: 11th month, 13th day but I don't know for sure.

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Old 06-30-2015, 01:36 PM   #37
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Thumbs up Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

Dave ;

Never fear any flaming here ! .

The good folks here collectively know _everything_ and are always willing to share , no question is foolish no matter how mundane you think it is .

O.K. ? .

Seriously , i worked on these trucks when new , later i was a Dealer Mechanic and I have learned more here than all those years of hands on working so ASK AWAY ! .

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Old 08-01-2015, 12:47 AM   #38
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

thank you!!!
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Old 08-01-2015, 10:20 AM   #39
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

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thank you!!!

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

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Old 08-01-2015, 05:53 PM   #40
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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,
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Old 08-01-2015, 06:22 PM   #41
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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.
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Old 08-01-2015, 11:29 PM   #42
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

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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
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Old 08-02-2015, 07:51 AM   #43
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

You know I found a thread where a guy had the same thing going on. His was a 3.07 non posi. My front end is 3.07 so I assume I've got the same. If I take the cover off I will be sure to post pics.

Thanks again,
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Old 05-31-2016, 12:25 PM   #44
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

Good information!
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Old 07-06-2016, 09:31 PM   #45
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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?
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Old 07-06-2016, 10:05 PM   #46
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

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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....

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Old 11-27-2016, 04:46 AM   #47
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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
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Old 11-27-2016, 11:22 AM   #48
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

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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

TPR..... It shows that code for a '70 KE-10, 3.07:1 ratio and a '71 G-10, 3.36:1 ratio.

Yep, in 40+ years anything is possible.

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Old 11-27-2016, 02:12 PM   #49
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

Thanks for posting this but I have a question. My axle code is TDE which just shows 3.07 gears. I thought my rear TDE was posi traction. The rear is not in the truck but if I lock one axle and the yoke in place the other axle will not turn. I thought this meant posi traction.

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Old 11-27-2016, 03:50 PM   #50
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Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks

Thanks this is all great info
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