Go Back   VetteMOD.com > VetteMOD Technical Discussion > Drive Train

Reply
 
Thread Tools
  #1  
Old 06-04-2020, 10:54 PM
rtj's Avatar
rtj rtj is offline
United States | Addict
 
Join Date: Nov 2011
Posts: 2,029
My Photos: (90)
Default Mark Williams is stepping up! More diff options.

Just got this in an email:

The C2 and C3 Corvette differentials come from the factory with a 17-spline inner flange yoke that can be prone to failure. Our solution is to upgrade the rear by modifying a stock Corvette posi-traction carrier with 30-spline side gears and adding a one-piece 300M 30-spline inner flange yoke shaft that eliminates the bolt-on flange yoke.
300M forging, double heat treated and shot peened
Increased strength with 30-tooth involute profile spline
Removable billet u-joint caps with studs and ARP® nuts
Uses standard GM c-clip to retain yoke shafts
100% machined and produced in house, in the USA
Part Number 50245 - C2/C3 Corvette Axles, Inner Yoke Shaft (stock differential)


[Only registered and activated users can see links. Click Here To Register...]

To upgrade the stock Corvette rear to use our 30-spline Inner Yoke Shafts, the posi-traction is modified by slightly increasing the bore size and using a 30-spline axle gear that is common to the 12-bolt GM passenger car posi-traction units. A simple machining operation to the posi-traction case is required. Instructions are provided for the modifications, but new, modified Eaton™ posi-traction units, with the 30-spline side gears, are available to save you time and assure the job is done right.

Part Number 19670-MOD

[Only registered and activated users can see links. Click Here To Register...]


Comments?

Last edited by rtj; 06-04-2020 at 11:03 PM..
Reply With Quote
  #2  
Old 06-05-2020, 01:25 PM
Red77 Red77 is offline
United States | Addict
 
Join Date: Jul 2012
Posts: 153
My Photos: (0)
Default

That's certainly promising. There really hasn't been much support since Tom's Differentials started slowly closing their doors. The side yokes are pricey, but the material spec and the fact that they are 30 spline is much better than what is currently available with 17 spline stockers. I'd also like to know what kind of spiders are available as that could be an issue. Nice to see them breathing life back into the C2/C3 rather than just writing it off and swapping in something entirely different. While that is an attractive option, it is often outside of the skill level of most enthusiasts.
Reply With Quote
  #3  
Old 06-05-2020, 04:40 PM
BBShark's Avatar
BBShark BBShark is offline
United States | Garage Monkey
 
Join Date: Mar 2008
Location: Right here
Posts: 4,658
My Photos: (336)
Default

Looks like nice stuff. Would be good to know how much "improvement" these parts provide.
__________________
Reply With Quote
  #4  
Old 06-06-2020, 12:45 PM
rtj's Avatar
rtj rtj is offline
United States | Addict
 
Join Date: Nov 2011
Posts: 2,029
My Photos: (90)
Default

These are the oem dimensioned forged yokes from Echlers at $389 each.



These are the new MW pieces.




Pretty meaty. I think MW sells the spider gears too.

I had been thinking of buying another kit from Tom’s, but this might be the ticket.

I got a couple of trans yokes from MW and the quality in nice. My guess is they offer outer axles soon.

Last edited by rtj; 06-06-2020 at 12:53 PM..
Reply With Quote
  #5  
Old 06-09-2020, 08:58 AM
OZgreen69's Avatar
OZgreen69 OZgreen69 is offline
Australia | Addict
 
Join Date: Apr 2016
Location: Perth Australia
Posts: 218
My Photos: (178)
Default

Is that would work with a tuned slip diff ? Hope that the clips side end is way harder than factory !
Van steel's selling Tom's bits now.
Reply With Quote
  #6  
Old 06-09-2020, 10:29 PM
rtj's Avatar
rtj rtj is offline
United States | Addict
 
Join Date: Nov 2011
Posts: 2,029
My Photos: (90)
Default

Quote:
Originally Posted by OZgreen69 View Post
Is that would work with a tuned slip diff ? Hope that the clips side end is way harder than factory !
Van steel's selling Tom's bits now.
I think they are c-clips like a 12 bolt Chevy. Yeah Van Steel, I saw that.

Welcome back! Did you ever install those high rate springs?
Reply With Quote
  #7  
Old 06-10-2020, 05:24 PM
Red77 Red77 is offline
United States | Addict
 
Join Date: Jul 2012
Posts: 153
My Photos: (0)
Default

That's got to be c-clip from the looks of it.
Reply With Quote
  #8  
Old 06-11-2020, 02:49 AM
mfain's Avatar
mfain mfain is online now
United States | Addict
 
Join Date: Jan 2011
Location: Las Vegas/Phoenix
Posts: 277
My Photos: (6)
Default

I have a complete Tom's set-up that I bought a few years ago, just as described by Mark Williams - never installed it. If someone needs it, I will dig it out and see what all is there. I know it has the axle shafts, side gears, clutches, and shafts. I am now using a Detroit Speed Hammerhead differential which also uses GM 12-bolt stuff.

Pappy
__________________
Pappy

Reply With Quote
  #9  
Old 06-11-2020, 03:39 AM
OZgreen69's Avatar
OZgreen69 OZgreen69 is offline
Australia | Addict
 
Join Date: Apr 2016
Location: Perth Australia
Posts: 218
My Photos: (178)
Default

Yes, I did . Run 1000 lbs spring in front and Guldstrand race spring at the rear, cannot say the rate of the rear accurately, just under the Daytona rate I think. The car is much faster on the chronometer. Spent lot of money with a so called suspension guru last year for not much results except the front springs. But I had a good time racing it, I just need to drive better But going quicker brings other problems, mainly front brakes !! How well....
Reply With Quote
  #10  
Old 06-26-2020, 10:59 AM
rtj's Avatar
rtj rtj is offline
United States | Addict
 
Join Date: Nov 2011
Posts: 2,029
My Photos: (90)
Default

Quote:
Originally Posted by OZgreen69 View Post
Yes, I did . Run 1000 lbs spring in front and Guldstrand race spring at the rear, cannot say the rate of the rear accurately, just under the Daytona rate I think. The car is much faster on the chronometer. Spent lot of money with a so called suspension guru last year for not much results except the front springs. But I had a good time racing it, I just need to drive better But going quicker brings other problems, mainly front brakes !! How well....
What was the company that sold you the springs?
Reply With Quote
Reply


Thread Tools

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

Forum Jump


All times are GMT. The time now is 12:00 AM.
 


Design by: vBulletin Skins Zone
Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2020, Jelsoft Enterprises Ltd.