What's new
By:
Filters
Old Chevelles

Welcome to OldChevelles.com, built by Auto Enthusiasts for Auto Enthusiasts. Cars are not our only interests so please feel free to post about any subject the community might enjoy or you just feel you need to air.

We respect free speech and constructive dialogue however we don't allow threatening talk against members, nudity, or pornography. Threads are monitored and trolls are not tolerated.

This site is completely free and there are no costs. Please enjoy and provide feedback.

  • We've enabled the website app for anyone who wants to use it on a mobile or desktop device.

  • We've changed the header logo to display our Member's Cars.

    If you'd like your car to show up there, go to the forum Site Bugs & Feature Requests and post your image in the "Member's Car Pictures for the Header Logo" and we'll add your car into the lineup.

What Rear End came in the 1967 Chevelle SS 396-325 hp (L35) if not specified by the buyer in 1967?

L78fanatic

L78fanatic

Well-Known Member
Senior Member
My recently purchased '67 SS seems to be a rather highly optioned car, but when looking at the axle housing the numbers/letters are very hard to read. It's likely an open differential since the car is an automatic (TH400) and only the L35 396 is in there, so I'm not holding my breath. From what I think the markings look like it may only be a 2.73:1, because it looks like "CZ" is stamped on the axle housing but it's very hard to read. So, I got to wondering what rear end would come in a 1967 SS 396 Chevelle when the buyer didn't specify a rear end ratio?? Of course, I spec'd a 4.10:1 Posi back in 1967 when I orderd my L78 Chevelle SS (Code "ZZ"). Wish I still had it! :confused:

Any ideas?

Thanks,

John

PS I posted this on Team Chevelle under the Transmission & Drivetrain Section so it likely is buried with no responses yet.
 
Just jack one rear tire up and see if you can rotate the tire with the trans in neutral. That will show if it's a posi or not.
And you can rotate the tire one full turn and count the driveshaft revolutions to determine the gear ratio.
 
Yup, thanks. I know how it’s done but I was just curious if anybody knows how it likely came from the factory. For instance, I didn’t know about the 3 types of Muncie 4-speeds back in 67....I just ordered a 4-speed and I ended up with the M-20. If I didn’t specify 4-speed I would have ended up with a Saginaw 3-speed.

Similarly, anyone who just ordered an SS 396 new might not have had the knowledge about differentials, so what did they likely end up with with the TH400 trans? I’m guessing either a 2.73 or a 3.07 open diff.

I haven’t gotten my car on my lift yet. Will very soon I hope.
 
Thanks! I missed that sheet. Well, I won’t be drag racing this Chevelle! LOL! 2.73 it is then! I’ll still check it on the lift. This car is pretty much all original though so I doubt the diff has ever been messed with.
 
L78fanatic said:
Thanks! I missed that sheet. Well, I won’t be drag racing this Chevelle! LOL! 2.73 it is then! I’ll still check it on the lift. This car is pretty much all original though so I doubt the diff has ever been messed with.
Click to expand...
If it is all-original, just buy a complete drop-in rear from Moser and save that old 12 bolt.
I'd get 3:55 gears if you aren't going with an overdrive. The Mosers use a true-trac helical posi which is much better that the 12 bolt clutch setup.
You are still thinking about installing the 375 hp engine ? 👋 (y)
 
I bought this car to build the clone of my ‘67 finished in Deepwater Blue (Code E-E), but as you know my health is sketchy at best! So, for now I’m just gonna enjoy driving Big Red as it was born. After all the research I did and genuine date correct parts I assembled for the’67 L78 block I may at least build the engine and see how I’m doing health wise. It will be more valuable as a newly built engine anyway. Time will tell.
 
Dr Pierre Kory developed a treatment protocol for post-covid problems.
It's here if you want to take a look at it ; maybe compare to what your Dr is doing ?
And we are all praying you get back to your old self. :)
 

Attachments

  • I-RECOVER-Post-Vaccine-2023-03-11.pdf
    1 MB · Views: 1
L78fanatic said:
For instance, I didn’t know about the 3 types of Muncie 4-speeds back in 67....I just ordered a 4-speed and I ended up with the M-20. If I didn’t specify 4-speed I would have ended up with a Saginaw 3-speed.
Click to expand...
Not a Saginaw, but a Borg Warner T16 as that was the heavy-duty 3spd installed behind Big Blocks.
 
That was surprising to me, the 2.73 continued through '68 as the standard ratio for the 325hp T400 non AC, but in '69 they changed to the 3.31 as standard.....have one. I also have 2.73 in my 67 Elky 396.....different cars but each has it's good points. The '67 is no slouch off the line, has plenty of torque to overtake the convertor and let the car rev a bit to get it going and at highway speeds it still has a great passing gear and cruise manners. I would use it and see if you like it. I wouldn't change mine, but it's strictly a street car.

..........and get healthy sir, we're rooting for you!
 
I’ll know more after I drive it some. Still waiting on my plate. I spoke with the previous owner today and it checks out as being a very original car, and he said it drives really nice. He received compliments on it everywhere he took it. And thanks for the best wishes & prayers!
 
You must log in or register to reply here.
Top Bottom