Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
 

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

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

Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
 

:chevy: Subscribed, good info here :metal::metal::metal:

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....

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?

LockDoc

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!

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

Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
 

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

LockDoc

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!

Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
 

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?

Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
 

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

LockDoc

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 ! :metal: .

:chevy:

Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
 

thank you!!!

Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
 

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

LockDoc

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

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. :chevy:

Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
 

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

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,
Chefk85

Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
 

Good information!

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?

Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
 

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

LockDoc

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

Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
 

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.

LockDoc

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.

Re: Rear Axle Ratio Charts For 1967 - 1972 GM Trucks
 

Thanks this is all great info