12 Bolt Upgrade - Page 2 - Chevelle Tech
Transmission & Driveline Transmissions and Differentials

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post #16 of 30 (permalink) Old Apr 11th, 19, 8:33 AM
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Re: 12 Bolt Upgrade

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Originally Posted by jackie schmidt View Post
I had Pyle Brothers in Baytown do my 12 bolt. The put Ford ends on, added Wilwood disc, Moser Axels, and best of all, the Eaton TruTrac.

Great setup. The TruTrac requires no additive, is super strong, and it does what a good Posi is supposed to do.
Jackie,

That is exactly what I want done to my 12 bolt (true-trac, new gears, better axles and ford ends).

Do they run into added expense installing the Ford ends on a 67 housing since it's shorter ? I was wondering if they have to relocate the shock mounts further inward.

Is there a ballpark price I can expect to pay ? I will strip and clean my housing and take it to whomever.

67 Chevelle convertible, 138 vin, original 4 speed, bucket seats, 12 bolt, Marina Blue with black interior
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post #17 of 30 (permalink) Old Apr 11th, 19, 8:46 AM
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Re: 12 Bolt Upgrade

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Originally Posted by 800XCR View Post
I'm having my 12 bolt updated to have the large Ford bearing ends to eliminate C-clip concerns. I also want to add disc brakes at the same time. What setups have been used with success. I will still be using 15x8 ralley wheels.

Wilwood makes very nice rear brake setups with in the hat parking brakes that work very well with the right cabling.


I used their four piston kit with 12.19" rotors. My stock 15" Rally wheels fit fine. They offer this setup to fit various rears. Let them know what you have and what you're doing and they'll tell you what kit is for you.


As far as eliminating C-clip retention, I'm for it. Also, I have a Ford 9" rear and I've never had issues with the seals leaking.
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post #18 of 30 (permalink) Old Apr 11th, 19, 8:47 AM
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Re: 12 Bolt Upgrade

If it wasn't for the disk brake thing that I do not know about, Strange makes a set of street/strip C clip eliminators better suited for street driving.

Ray


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post #19 of 30 (permalink) Old Apr 11th, 19, 8:59 AM
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Re: 12 Bolt Upgrade

For decades, Moroso has had on the market "climbing gear lube". It's great stuff. BUT, during use, it's drawn into the gears and it stays there, it's very sticky. Several companies offer climbing gear lube.

BUT, using it in a rear with open axle bearings such as a stock GM rear results in burned axle bearings because while driving, there's no lube on the bearings.

This is NOT an issee with Ford style sealed axle bearings because they don't rely on the diff fluid for lubrication. This may help "cure" seal leaking for you guys that have this problem.

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post #20 of 30 (permalink) Old Apr 11th, 19, 10:16 AM
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Re: 12 Bolt Upgrade

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Originally Posted by Yukon0724 View Post
You ever see a axle break at the track? Very violent and destructive to the car. And very dangerous to the Driver and Spectators. These is no way, no how those little bitty ass 10mm, 3/8 or whatever size caliper bolts are going to hold the axle in.
OP, Do it the right and safe way and go the Ford housing ends and contact Wilwood. They makes brake kits for all kinds of axle flanges.


https://www.wilwood.com/BrakeKits/BrakeKitAxleFlange
And yet those "itty bitty" bolts are capable of handling the weight of the car every single time the brakes are applied..... Just sayin'.

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post #21 of 30 (permalink) Old Apr 11th, 19, 1:23 PM
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Re: 12 Bolt Upgrade

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Originally Posted by Rich-L79 View Post
And yet those "itty bitty" bolts are capable of handling the weight of the car every single time the brakes are applied..... Just sayin'.
It may be the difference between a shear load and a tension load. In aircraft there is a significant difference between two fasteners that look identical, but are designed for different types of load. The head markings aren’t there just for decoration...
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post #22 of 30 (permalink) Old Apr 11th, 19, 2:22 PM
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Re: 12 Bolt Upgrade

Can anybody give me an approximate price of what I'm in for ? LOL

Taking my disassembled and cleaned 12 bolt housing to someone for :

True trac differential, ring and pinion,new axles and ford bearing housing ends ?

Can I get this done for $2500 ?? I think the parts will be $1400-$1500.

67 Chevelle convertible, 138 vin, original 4 speed, bucket seats, 12 bolt, Marina Blue with black interior
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post #23 of 30 (permalink) Old Apr 11th, 19, 2:56 PM
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Re: 12 Bolt Upgrade

Quote:
Originally Posted by nashville beth View Post
Can anybody give me an approximate price of what I'm in for ? LOL

Taking my disassembled and cleaned 12 bolt housing to someone for :

True trac differential, ring and pinion,new axles and ford bearing housing ends ?

Can I get this done for $2500 ?? I think the parts will be $1400-$1500.

Check with Toms differentials I bought almost all my 12 bolt parts from him(the few parts I bought else where was from Mark Williams), his Ford ends are very nice they are threaded instead of using t-bolts for the axle retainer/backning plates.
https://www.tomsdifferentials.com/
Tom passed away last Year but afaik his wife and doughter runs the business.
Heres some pics of my 12 bolt.

https://www.chevelles.com/forums/33-...w-12-bolt.html

Or check with Tory aka Lionel-n-Chevelles, he can help you with parts.
https://www.chevelles.com/forums/mem...chevelles.html

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post #24 of 30 (permalink) Old Apr 11th, 19, 3:44 PM
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Re: 12 Bolt Upgrade

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Originally Posted by SSJohn View Post
It may be the difference between a shear load and a tension load. In aircraft there is a significant difference between two fasteners that look identical, but are designed for different types of load. The head markings aren’t there just for decoration...
The pressures are no different than those put on the bolt-on bearing retainer in a non-C-clip axle (which are itty bitty bolts too by the way). Those too are not pressures those bolts are not intended to to take yet they do and do just fine.

No axle on a c-clip rear end with disc brakes is going anywhere even if the axle breaks. It's going to bugger up a lot of things, but it's not leaving the car.

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post #25 of 30 (permalink) Old Apr 11th, 19, 4:14 PM
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Re: 12 Bolt Upgrade

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Originally Posted by Rich-L79 View Post
No axle on a c-clip rear end with disc brakes is going anywhere even if the axle breaks. It's going to bugger up a lot of things, but it's not leaving the car.
Keeping the c-clips and not installing ford ends on my 12 bolt would probably save $300+.

I think c-clips are outlawed if you run faster than 10.99 ? I don't expect to get close to that.

If the 12 bolt gets too close to a S60 Strange in price , I'm going to the dark side with the Dana. LOL

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Last edited by nashville beth; Apr 11th, 19 at 4:30 PM.
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post #26 of 30 (permalink) Old Apr 11th, 19, 5:17 PM
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Re: 12 Bolt Upgrade

Quote:
Originally Posted by Rich-L79 View Post
The pressures are no different than those put on the bolt-on bearing retainer in a non-C-clip axle (which are itty bitty bolts too by the way). Those too are not pressures those bolts are not intended to to take yet they do and do just fine.

No axle on a c-clip rear end with disc brakes is going anywhere even if the axle breaks. It's going to bugger up a lot of things, but it's not leaving the car.
I agree with you, and never said, or think, that the axles would leave the car. Just offering up a different “plane”of thought
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post #27 of 30 (permalink) Old Apr 11th, 19, 6:50 PM
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Re: 12 Bolt Upgrade

Quote:
Originally Posted by nashville beth View Post
Jackie,

That is exactly what I want done to my 12 bolt (true-trac, new gears, better axles and ford ends).

Do they run into added expense installing the Ford ends on a 67 housing since it's shorter ? I was wondering if they have to relocate the shock mounts further inward.

Is there a ballpark price I can expect to pay ? I will strip and clean my housing and take it to whomever.
With the value of a '67 12 bolt and the cost that you will be out by having these modifications done you would be better off selling the '67 12 bolt and getting a Moser housing with the Ford ends already installed. The Moser housing has a thicker casting, much larger bearing caps with larger bolts, thicker seamless axle tubes and the Moser shock mounts do not interfere with the housing ends.
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post #28 of 30 (permalink) Old Apr 11th, 19, 7:46 PM
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Re: 12 Bolt Upgrade

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Originally Posted by big gear head View Post
With the value of a '67 12 bolt and the cost that you will be out by having these modifications done you would be better off selling the '67 12 bolt and getting a Moser housing with the Ford ends already installed. The Moser housing has a thicker casting, much larger bearing caps with larger bolts, thicker seamless axle tubes and the Moser shock mounts do not interfere with the housing ends.
What do you think of the S60? It seems to be $500 cheaper and looks stronger.

Another plan is to build the 12 bolt without the Ford ends and keep the c-clip axles. Just install a true-trac with 30 spline axles and new gears.

I am installing 2002 Camaro rear disc brakes in case an axle does break.

That wouldn't cost a bundle, would it ? :-)

67 Chevelle convertible, 138 vin, original 4 speed, bucket seats, 12 bolt, Marina Blue with black interior
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post #29 of 30 (permalink) Old Apr 11th, 19, 8:02 PM
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Re: 12 Bolt Upgrade

Quote:
Originally Posted by Malibu ss 64 View Post
Check with Toms differentials I bought almost all my 12 bolt parts from him(the few parts I bought else where was from Mark Williams), his Ford ends are very nice they are threaded instead of using t-bolts for the axle retainer/backning plates.
https://www.tomsdifferentials.com/
Tom passed away last Year but afaik his wife and doughter runs the business.
Heres some pics of my 12 bolt.

https://www.chevelles.com/forums/33-...w-12-bolt.html

Or check with Tory aka Lionel-n-Chevelles, he can help you with parts.
https://www.chevelles.com/forums/mem...chevelles.html
Thanks, I got his catalog. Great looking rear, I mean 12 bolt ! LOL
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67 Chevelle convertible, 138 vin, original 4 speed, bucket seats, 12 bolt, Marina Blue with black interior
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post #30 of 30 (permalink) Old Apr 11th, 19, 8:05 PM
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Re: 12 Bolt Upgrade

Quote:
Originally Posted by nashville beth View Post
What do you think of the S60? It seems to be $500 cheaper and looks stronger.

Another plan is to build the 12 bolt without the Ford ends and keep the c-clip axles. Just install a true-trac with 30 spline axles and new gears.

I am installing 2002 Camaro rear disc brakes in case an axle does break.

That wouldn't cost a bundle, would it ? :-)
I like the S60, except I like Moser housing ends better. I was going to use the S60 housing in my Chevelle and order it without ends. Then I was going to install Moser ends on it. I'm not building a Chevelle now, so that's out the window.


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