Club Cobra Keith Craft Racing  

Go Back   Club Cobra > Cobra Talk Areas > Scratch Builders Forum

Welcome to Club Cobra!  The World's largest non biased Shelby Cobra related site!

  •  » Representation from nearly all Cobra/Daytona/GT40 manufacturers
  •  » Help from all over the world for your questions
  •  » Build logs for you and all members
  •  » Blogs
  •  » Image Gallery
  •  » Many thousands of members and nearly 1 million posts! 

YES! I want to register an account for free right now!  p.s.: For registered members this ad will NOT show

Keith Craft Racing
Nevada Classics
Main Menu
Module Jump:
Nevada Classics
Nevada Classics
Keith Craft Racing
Keith Craft Racing
Advertise at CC
Banner Ad Rates
MMG Superformance
MMG Superformance
MMG Superformance
MMG Superformance
July 2019
S M T W T F S
  1 2 3 4 5 6
7 8 9 10 11 12 13
14 15 16 17 18 19 20
21 22 23 24 25 26 27
28 29 30 31      

Kirkham Motorsports

Like Tree8Likes

Reply
 
LinkBack Thread Tools Rate Thread Display Modes
  #1 (permalink)  
Old 05-23-2019, 02:32 PM
Tjd Tjd is offline
CC Member
Visit my Photo Gallery

 
Join Date: Jun 2015
Cobra Make, Engine:
Posts: 64
Not Ranked     
Default C3 conversion for CSX style chassis

Currently doing a big black chassis and going to use a C3 Corvette differential itís Direct bolt in will fit Hi tech, Kirkam,CSX or any chassis built to original specs
Attached Images
   
1985 CCX likes this.
Reply With Quote
Sponsored Links
Sponsored Links
  #2 (permalink)  
Old 05-23-2019, 07:13 PM
Club Cobra Member
Visit my Photo Gallery

 
Join Date: Mar 2002
Location: arroyo grande, ca, ca
Cobra Make, Engine: NAF 427
Posts: 1,477
Not Ranked     
Default

Looks great. Where do we learn more?

Cheers
Greg
Reply With Quote
  #3 (permalink)  
Old 06-25-2019, 08:56 PM
CC Member / Sponsor
Visit my Photo Gallery

 
Join Date: Jan 2002
Location: Provo, UT
Cobra Make, Engine: Kirkham 427, 289 Targa Florio
Posts: 1,325
Not Ranked     
Default

Tom,

That looks very clever.
Will it fit into a 289 chassis?
__________________
"There is nothing nice about a Cobra. It is stripped down to the essentials- a big engine, a small car, and four wide tires to keep the whole business on pavement. Its loud, smells like gasoline, and shakes, shudders, and bucks. It makes your arms tired and your feet hot. You nearly crash about once every 10 minutes. Its so damn wonderful that you cant believe it" Automobile Magazine 2004
Reply With Quote
  #4 (permalink)  
Old 06-26-2019, 08:41 AM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4.6
Posts: 1,081
Not Ranked     
Default

Very creative Tom.

I'm not that familiar with Corvette IRS hardware. Which year did you source the center from. My unfamiliar memory seems to recall the Corvette center castings having a lot of additional bosses for attachment of or to different parts of the Corvette IRS cradle.

I like how clean you made the adapters for the the rear and front mounting points. Have you experienced any fluid leakage at the rear adapter? If you would share, I'd be interested in how you resolved the oil seal between your fabricated adapter, the case and the rear cover?

Very nice job!


Ed
__________________
Help 'em do what they would have done if they knew what they could do.
Reply With Quote
  #5 (permalink)  
Old 06-26-2019, 09:59 AM
Club Cobra Member
Visit my Photo Gallery

 
Join Date: Mar 2002
Location: arroyo grande, ca, ca
Cobra Make, Engine: NAF 427
Posts: 1,477
Not Ranked     
Default

Great idea and creativity. I'm not familiar enough with the C3 either (Eaton? or Dana? iron? or alum?) but what is that dif frear cover? Seems to have a part number on it.

Cheers
Greg
Reply With Quote
  #6 (permalink)  
Old 06-26-2019, 10:04 AM
Club Cobra Member
Visit my Photo Gallery

 
Join Date: Mar 2002
Location: arroyo grande, ca, ca
Cobra Make, Engine: NAF 427
Posts: 1,477
Not Ranked     
Default

By the way. I think I see a saleable product there.

Cheers
Greg
1985 CCX likes this.
Reply With Quote
  #7 (permalink)  
Old 06-26-2019, 10:08 AM
Club Cobra Member
Visit my Photo Gallery

 
Join Date: Mar 2002
Location: arroyo grande, ca, ca
Cobra Make, Engine: NAF 427
Posts: 1,477
Not Ranked     
Default

OK. I see lots of nice Dana 44 diff rear covers on e-bay.

I need to educate myself.

Cheers
Greg
Reply With Quote
  #8 (permalink)  
Old 06-26-2019, 11:03 AM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4.6
Posts: 1,081
Not Ranked     
Default

Quote:
Originally Posted by my427cobra View Post
Great idea and creativity. I'm not familiar enough with the C3 either (Eaton? or Dana? iron? or alum?) but what is that dif frear cover? Seems to have a part number on it.

Cheers
Greg

The Corvettes and Vipers used "Vitamin C enriched" Dana 44's, Greg.

BTW you're right, I think that Tom's got a salable product there.


Ed
__________________
Help 'em do what they would have done if they knew what they could do.
Reply With Quote
  #9 (permalink)  
Old 06-26-2019, 11:38 AM
LMH's Avatar
LMH LMH is offline
CC Member
Visit my Photo Gallery

 
Join Date: Apr 2005
Location: Tucson, AZ
Cobra Make, Engine:
Posts: 5,018
Not Ranked     
Default

Quote:
Originally Posted by my427cobra View Post
OK. I see lots of nice Dana 44 diff rear covers on e-bay.

I need to educate myself.

Cheers
Greg
Just make sure it has the correct level plug in the cover.
Larry
Riverside racer likes this.
__________________
Alba gu brŗth
Reply With Quote
  #10 (permalink)  
Old 06-26-2019, 12:59 PM
Tjd Tjd is offline
CC Member
Visit my Photo Gallery

 
Join Date: Jun 2015
Cobra Make, Engine:
Posts: 64
Not Ranked     
Default

I have a few questions to answer
1. set up shown is for urethane bushings or if you wish you could have the metal elastic like the originals
2. Yes it will fit a 289 chassis I started in 80 building cobras my original plan was to try to build something that was nice and close to the original yet economical that didn’t quite work out that was really nothing that you could use in the stock form so my first one or two cars with a 9 inch straight axle And mustang upper and lower control arms in the front then switched to tubular control arms full-size Ford spindles. did one chassis with the Corvette IRS with cobra suspension. then went to the 9 inch IRS don’t know why thought it was stronger which it is and never use the Corvette diff again
3. Never had a problem with oil leaks in the C3 Diff. but everyone wanted the 9 inch.
4. Believe the C2 and C3 cast-iron cases use the same mounting the C3 aluminum cases have the front pinion mount cast. Ptrying to find a used alouminum case now to check that.
There are remanufactured C3 differentials with all new parts for $1800 and if you want to get more original Down the road. can take it out and put it in an aluminum Diff from cobra racing or Kirkam.
Remember I talk to my phone any miss spelled words or grammar it’s the phones fault
Tom
Reply With Quote
  #11 (permalink)  
Old 06-26-2019, 06:53 PM
Tom Wells's Avatar
Senior Club Cobra Member
Visit my Photo Gallery

 
Join Date: Mar 2000
Location: St. Augustine, FL
Cobra Make, Engine: E-M / Power Performance / 521 stroker / Holley HP EFI
Posts: 1,652
Not Ranked     
Default

Tom,

Aluminum C3 cases may be too weak to withstand much HP. I believe they were used behind automatics from the factory, where the cast iron unit was used behind stick shift transmissions.

A friend's Cobra ate one of the aluminum ones in spectacular fashion while just cruising the interstate and minding his own business. Admittedly it already had some spirited use behind a fairly tame small block plus some track day exercise. He has since switched to the cast iron version.

Just a heads-up.

BTW, your disclaimer about the speech-to-text app gave me a good chuckle.
1985 CCX likes this.
__________________
Wells's law of engine size: If it matters what gear you're in, the engine's too small!
Reply With Quote
  #12 (permalink)  
Old 06-26-2019, 07:05 PM
Tjd Tjd is offline
CC Member
Visit my Photo Gallery

 
Join Date: Jun 2015
Cobra Make, Engine:
Posts: 64
Not Ranked     
Default

Tom
Now that you mention it they have two versions of the aluminum case the pissant for a little Old ladies and the bigger one which is a little better but some people are concerned about weight. And they have their own bat wings and not interchangeable from what I understand
Tom
Reply With Quote
  #13 (permalink)  
Old 06-27-2019, 07:46 AM
moore_rb's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Aug 2015
Cobra Make, Engine: Original, with Chevy engine since 1964
Posts: 930
Not Ranked     
Default

Quote:
Originally Posted by Tjd View Post
Believe the C2 and C3 cast-iron cases use the same mounting the C3 aluminum cases have the front pinion mount cast. trying to find a used alouminum case now to check that.
Yes, most C2 and early C3 Corvette diff cases (up to 78) are externally very similar- everything bolts up in the same places...

I also agree with Tom Wells that the later-C3 aluminum cases (the "O" cases, as in "Oh my God, what a piece of crap") should be avoided in high HP applications. From the factory, these cases were only used behind smog-era small blocks that barely made 150HP at the rear wheels.

This is very cool work, and would be a great alternative for guys who want a cheaper, stronger, and more readily available alternative to the Jag-style diff...

Corvette Diffs are all over the place, and one other nice thing about them is that they were factory stamped with a code that tells you just about everything that is going on inside the case (gear ratio, and whether it has open spider gears, or a posi/limited slip carrier) You can even tell from the stamped code whether the posi units were originally an Eaton posi (used most often behind small block cars), or the the Warren (Auburn) posi carrier that was most commonly used under big-block Vettes. (there are numerous exceptions to this rule, and there are many 66-67 big-block vettes out there with Eaton diffs, but the vast majority of big block Corvettes were sold between 68 and 71, and 80% of those cars had Warren gear cases and posis)

for penny-pinchers who might want to save a few extra bucks by sourcing their own diff from a junkyard and having it rebuilt, Wilcox Corvette has done a ton of the footwork putting together the list of factory stamp codes that will help you determine which corvette gear cases might be best for your project:


63-67 Corvette gear cases:
1963-1967 Corvette Rear Axle Codes and Ratios | Willcox Corvette, Inc.

68-70:
1968-1970 Corvette Rear Axle Codes and Ratios | Willcox Corvette, Inc.

71=82: (remember: Stay away from the "O"s if you plan to add big HP):
1971-1982 Corvette Rear Axle Codes and Ratios | Willcox Corvette, Inc.


Hope this helps...
__________________
- Robert
Reply With Quote
  #14 (permalink)  
Old 06-27-2019, 02:02 PM
Club Cobra Member
Visit my Photo Gallery

 
Join Date: Mar 2002
Location: arroyo grande, ca, ca
Cobra Make, Engine: NAF 427
Posts: 1,477
Not Ranked     
Default

I'm learning so much here as I shift through all the responses:

Cast iron cases: 1963 to 1975

Aluminum cases: 1976 to 1982

Auburn Posi: 1963 through 1967

Warren Posi : coded with a "W" suffix in 1968 through 1970 otherwise Auburn

So I'm looking at Tom's pictures of his adapter:

He appears to be using a Dana 44 rear cover (with filler plug and breather), bolted to the rear of the adapter.

The adapter appears to be fastened to the diff housing with countersunk fasteners in the Corvette diff bolt pattern.

So you use a Corvette diff gasket on the front side and a Dana 44 gasket on the back side

Am I right so far?

Cheers
Greg
Reply With Quote
  #15 (permalink)  
Old 06-27-2019, 03:30 PM
Tjd Tjd is offline
CC Member
Visit my Photo Gallery

 
Join Date: Jun 2015
Cobra Make, Engine:
Posts: 64
Not Ranked     
Default

A picture is worth 1000 words. Maybe not that many you are correct Greg.
Robert thank you for the data on the housings much appreciated this is the first Corvette diff I’ve touched since 1982 I was trying to find some pictures of the one did back then don’t know where they are
Tom
Reply With Quote
  #16 (permalink)  
Old 06-27-2019, 04:57 PM
eschaider's Avatar
CC Member
Visit my Photo Gallery

 
Join Date: Feb 2006
Location: Gilroy, CA
Cobra Make, Engine: SPF 2291, Whipple Blown & Injected 4.6
Posts: 1,081
Not Ranked     
Default

Tom, I thought the Corvet IRS center sections were Dana 44 derivatives. Are they actually something else or do they come out of that same Dana 44 gene pool?

Ed
__________________
Help 'em do what they would have done if they knew what they could do.
Reply With Quote
  #17 (permalink)  
Old 06-27-2019, 05:28 PM
Tjd Tjd is offline
CC Member
Visit my Photo Gallery

 
Join Date: Jun 2015
Cobra Make, Engine:
Posts: 64
Not Ranked     
Default

Ed
from what I understand they’re not Dana 44’s but you can modify a case to except a Dana 44 I could be wrong I’m no expert. look at Roberts post he gives a good List and location to identify all C2-C3 diff
I’m doing this for my future leafspring car but if anyone’s interested in a set up to convert a Diff let me know I’m waiting for a waterjet guy to give me pricing and then I can figure out a price.
If anyone’s interested
Tom
Reply With Quote
  #18 (permalink)  
Old 06-28-2019, 07:43 AM
Club Cobra Member
Visit my Photo Gallery

 
Join Date: Mar 2002
Location: arroyo grande, ca, ca
Cobra Make, Engine: NAF 427
Posts: 1,477
Not Ranked     
Default

Tom. What's the part number on your rear cover? It seems unusual in that it has a breather.

Cheers
Greg
Reply With Quote
  #19 (permalink)  
Old 06-28-2019, 09:02 AM
Tjd Tjd is offline
CC Member
Visit my Photo Gallery

 
Join Date: Jun 2015
Cobra Make, Engine:
Posts: 64
Not Ranked     
Default

Greg
It’s a modified 44 cover the same one that we used on the shelby diff.
Tom
Reply With Quote
  #20 (permalink)  
Old 06-28-2019, 04:40 PM
CC Member
Visit my Photo Gallery

 
Join Date: Mar 2009
Location: Mendota, IL
Cobra Make, Engine:
Posts: 497
Not Ranked     
Default

Tom when you did your 9 inch fords. What did you use for your stub axles? Were they cut down stock axles? What did you use for half shafts? Would original cobra half shafts bolt to them? Just wondering because I thought about building one to put in a leaf spring chassis.

Thanks Mark
Reply With Quote
Reply

Thread Tools
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -7. The time now is 10:41 PM.


Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2019, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: CC Policy
Links monetized by VigLink