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Username Post: Rear end ratio 1967        (Topic#331607)
rls8836 
Member
Posts: 334

Loc: North La.
Reg: 01-30-02
12-27-15 03:55 PM - Post#2598027    

My camaro has a limited slip tag on the rear-end. I tried to check the ratio with chalk marks and rotating the wheel twice and counting driveshaft rotations. I came up with a 3:42. I know for a fact it is positraction. Was this third member offered in my Camaro from factory in 67?



 




SteveW 
Senior Member
Posts: 1531

Loc: Shreveport
Reg: 04-24-02
12-28-15 12:39 AM - Post#2598136    
    In response to rls8836

327 motor.
Standard 3.08:1
Economy 2.73:1
Performance 3.55:1

350 Motor
Standard 3.31:1
Economy 3.07:1
Performance 3.55:1

SteveW


 
raycow 
Honored Member
Posts: 26543
raycow
Loc: San Francisco, CA
Reg: 11-26-02
12-28-15 09:06 AM - Post#2598175    
    In response to rls8836

You didn't say whether you have a 10 bolt or a 12 bolt rear. 3.42 was not offered as a factory option in either one. It is available as an aftermarket gearset for the factory 12 bolt, but not the factory 10 bolt (8.2").

If you have a 12 bolt, you probably have an aftermarket gearset. If a 10 bolt, you likely have a complete rear end swap. In that case, you will need to find out what kind of 10 bolt, because there are several different possibilities.

Crawl all over the center section until you find a casting number and a casting date code. These will be raised numbers CAST into the center section, not stamped. If you do find any stamped numbers, post those too.

Ray

There's a line between good and evil no wider than a razor's edge - D.S. James Hathaway quoting from The Night Keeper


 
SteveW 
Senior Member
Posts: 1531

Loc: Shreveport
Reg: 04-24-02
01-23-16 11:04 PM - Post#2604127    
    In response to SteveW

RPO (regular production option) L48 295-hp Turbo-fire 350-cu-in V8
(Special axle ratios)

1. 3-speed transmission -optional 3.73:1
2. Powerglide transmission-optional 3.55:1&3.73:1
3. 4-Speed Transmission -optional 3.73:1 and available as positraction axle only 4.10:1 ,4.56:1,and 4.88:1


SteveW


 
pdq67 
Member
Posts: 470

Loc: Columbia, MO, USA
Reg: 08-31-02
01-29-16 07:04 PM - Post#2605330    
    In response to SteveW

I dearly love my 12-bolt, 3.31 posi-.

Ordered it that way.

pdq67



 
rls8836 
Member
Posts: 334

Loc: North La.
Reg: 01-30-02
02-15-16 10:59 AM - Post#2608942    
    In response to raycow

raycow I have a 10 bolt, the driveshaft turned less than 3 1/2 turns with 1 revolution of the tire. that's why I assumed a 3:31. Will try and jack up car and find all id info and post



 
rls8836 
Member
Posts: 334

Loc: North La.
Reg: 01-30-02
02-15-16 11:05 AM - Post#2608943    
    In response to pdq67

PDQ67 I've seen your car on the net, nice you have kept it this long. Would you know what rpms you run at 60,70 mph?



 
pdq67 
Member
Posts: 470

Loc: Columbia, MO, USA
Reg: 08-31-02
02-16-16 09:47 PM - Post#2609403    
    In response to rls8836

Sure with stock D-70/14, Redlines, that range from 25.3" to 25.5" in dia., it runs 3070 to 3050 rpm at 70 mph.

I installed my great big 9.50/14 Firestone, Town & Country, Mud & Snow tires on my car by raising it about 4" to 4.5" and my speed went from 70 mph to 82!! They were right at 29.5" in dia...

My car was still going up at 145 mph early one Monday morning trying to get back to my Mom's place to catch my carpool to go to IA when I was working on the RR as a kid back in the spring of '67.

pdq67



 
raycow 
Honored Member
Posts: 26543
raycow
Loc: San Francisco, CA
Reg: 11-26-02
02-17-16 02:51 AM - Post#2609426    
    In response to rls8836

  • rls8836 Said:
raycow I have a 10 bolt, the driveshaft turned less than 3 1/2 turns with 1 revolution of the tire. that's why I assumed a 3:31.


3.31 was not offered as a 10 bolt 8.2" ratio, but 3.36 was. That's most likely what you have.

Ray

There's a line between good and evil no wider than a razor's edge - D.S. James Hathaway quoting from The Night Keeper


Edited by raycow on 02-17-16 03:02 AM. Reason for edit: No reason given.

 
pdq67 
Member
Posts: 470

Loc: Columbia, MO, USA
Reg: 08-31-02
04-03-16 08:08 PM - Post#2619430    
    In response to raycow

I want to say that "Steve's Nova Site" lists all the rear end options for almost everything.

Might hunt it up.

I know there is one somewhere because I looked through it through the years.

Oh, not applicable here, but don't forget about the old P/U 12-bolt rear ends..

pdq67



 
models916 
Valued Contributor
Posts: 4584

Age: 66
Loc: Addison, IL
Reg: 05-28-10
04-12-16 05:11 AM - Post#2621082    
    In response to pdq67

Truck 12 is very weak. Small diameter pinion shaft. Works in the truck because of the larger ring gear but for performance it is just marginal.



 
pdq67 
Member
Posts: 470

Loc: Columbia, MO, USA
Reg: 08-31-02
04-18-16 08:24 PM - Post#2622743    
    In response to models916

Somewhere, somebody did a write up on our car sites on the web telling how to install either 12-bolt car gears in a 12-bolt P/U housing OR the 12-bolt P/U gears in our car 12-bolt housing.

A very detailed and quite interesting install if anybody is interested in this??

I do know it caught my eye because my old '80 C/10 had 12-bolt P/U 2.76 reg's under it and I was thinking about them under my Camaro for a heck of a top-end charge vs my 3.31's!

pdq67



 
pdq67 
Member
Posts: 470

Loc: Columbia, MO, USA
Reg: 08-31-02
07-09-17 08:36 AM - Post#2699315    
    In response to rls8836

Sorry rls8836, my car has NEVER been posted on the web that I know of! It has been garaged for more years than I want to think about.

I was once riding to a small car show with JimM (1st Gen. Site), in his blue,'68 rag-top car. It has a white top.

If I remember right, Mark McGraw(?) from St. Lois was following along in his red Camaro and took a picture of me in Jim's car and it has been posted on the web.

Way years ago here. Probably can't find it though???

pdq67



Edited by pdq67 on 07-09-17 08:37 AM. Reason for edit: No reason given.

 
pdq67 
Member
Posts: 470

Loc: Columbia, MO, USA
Reg: 08-31-02
08-12-17 02:14 AM - Post#2703835    
    In response to pdq67

Back again, if not mistaken our rear end housings axle tubes have code numbers stamped on them. I want to say on the pass. side so you might look there.

Probably like about in the middle in the front???

pdq67



 




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