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[Fot] Rear Axle upgrade GT6

Subject: [Fot] Rear Axle upgrade GT6
From: info at dieselperformanceparts.com (DPPI - Mark Craig)
Date: Thu, 22 Mar 2018 19:23:14 +0000
References: <2b813075-26a0-a848-cdb0-6527e8f39d5c@wishboneclassics.com> <SC1P152MB1696996AD943D670DD8CD5B0B2AA0@SC1P152MB1696.LAMP152.PROD.OUTLOOK.COM> <636988502.4638180.1521648410002@mail.yahoo.com> <0270eb69bf4e4251ab22a5d1eb28079e@dieselperformanceparts.com> <5264BB67-8313-41BE-B2BC-1936CF6A6955@me.com> <0D2CBCBB-2B6E-48C3-93B4-08C05E58EC71@voyagerhldgs.com> <453b9226c1214feb8b87514126efa76b@dieselperformanceparts.com> <CAGiQU1DsL9o3_Yvdg6R0SQ2TTVtuzeX2rSMWQoN3kn3dWJKV3Q@mail.gmail.com> <4e5cffd321ee42ffac69854b2ba6e562@dieselperformanceparts.com> <CAGiQU1CX6RvTwDzV3QMSFsTK8CyPpxwzgLvP_BQn+y1iNsyeTg@mail.gmail.com> <4c558cd758744538b042192e5ac7d0c8@dieselperformanceparts.com> <53B0CBBA-FBAE-4CDB-A36E-667AF459740C@gmail.com>
Brad,

I think that would make that applicable to Spits too then wouldn?t it??  If so 
I would want a copy of any info you have.

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Mark Craig
Diesel Performance Parts, Inc.
411 Allied Drive, Nashville, TN 37211
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From: Brad Eells [mailto:tr4abrad at gmail.com]
Sent: Thursday, March 22, 2018 1:46 PM
To: DPPI - Mark Craig <info at dieselperformanceparts.com>
Cc: Kas Kastner <kaskastner at gmail.com>; fot at autox.team.net
Subject: Re: [Fot] Rear Axle upgrade GT6

Hello Amici,

My Mk3 Spitfire came with a set of the original Kastner-Brophy rear axles. They 
were designed by my car?s owner/builder/driver, Doug Brown who worked for Kas 
at that time.

I found among Doug?s notes, much information and sketches of the design work. I 
am happy to share them if anyone finds value in the information beyond 
historical curiosity.

As Kas mentioned, it?s a combination of material, forging and ancillaries that 
make these particular axles nearly indestructible.

I have recently refurbished my set. I found the yoke parts to be Spicer parts 
that are still available. I also did some research on U-Joints and upgraded to 
a stronger, non-greasable Dana-Spicer unit.

This solution is applicable only to the earlier models without Rotoflex or 
other double jointed later axles.
Brad Eells
Sent from my iPhone

Sure always need info on anything like that.
I sure wish you had some of yours around today!!!
I confirmed on that car as best as I could after the wreck that the axle isn?t 
hitting the frame as it passes over it between the diff and the wheel end. 
Checked the other cars I got too so far none of them do. I did notice all the 
frames are crushed in that area and it seems like it was done at the factory 
too??
<image001.png><dieselperformanceparts.com>



Mark Craig
Diesel Performance Parts, Inc.
411 Allied Drive, Nashville, TN 37211
www.dieselperformanceparts.com<http://www.dieselperformanceparts.com/>

<image002.jpg><https://www.facebook.com/DieselPerformanceParts> 
<image003.jpg><https://twitter.com/PerfectDiesel> 
<image004.jpg><https://plus.google.com/u/0/104451046659790804057/posts> 
<image005.jpg><http://www.linkedin.com/company/diesel-performance-parts-inc->




Phone: 615-834-0066
Fax: 615-834-9923




From: Kas Kastner [mailto:kaskastner at gmail.com]
Sent: Thursday, March 22, 2018 11:59 AM
Subject: Re: [Fot] Rear Axle upgrade GT6

Really sorry to hear of this.  My axles were made of material which was so 
costly and hard to find I had to by 500 pounds of it.  Then I had the axles 
forged instead of billet machined. All this  does not help you a bit but I can 
give you a part number a much better and bigger U-joint which we also included 
with my axles if that will be a help. My research years ago on this was the 
rear end of the car was bottoming out and putting all the weight on the axle 
and it just could not hold it.


Never be beaten by equipment.

Yes they were Sommers Bros out of CA.  The U Joint failed.
I hear the Joe Siam ones are breaking too. A friend in FL has had two sets of 
them break.

That?s why when I started to rebuild the wreck I thought I would go with the 
Canley CV axles and the GT6 lower arms. At least if the axle breaks the wheel 
stays upright.  But now I hear the Canley CV axle isn?t strong enough for a GT6 
and I am nervous.  I really didn?t want to do that as it changes the ?Attitude? 
of the Spit and how it feels, but I don?t want to end up on me head again 
either.

Here?s a U tube link to the accident:

https://www.youtube.com/watch?v=05dsw_zQD0k




<image006.png><http://dieselperformanceparts.com>



Mark Craig
Diesel Performance Parts, Inc.
411 Allied Drive, Nashville, TN 
37211<https://maps.google.com/?q=411+Allied+Drive,+Nashville,+TN+37211&entry=gmail&source=g>
www.dieselperformanceparts.com<http://www.dieselperformanceparts.com/>

<image002.jpg><https://www.facebook.com/DieselPerformanceParts><image003.jpg><https://twitter.com/PerfectDiesel>
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Phone: 615-834-0066
Fax: 615-834-9923




Sent: Thursday, March 22, 2018 11:29 AM
Subject: Re: [Fot] Rear Axle upgrade GT6

Are you using or rather were you using one piece axles where the hub and the 
axle are one piece?


Never be beaten by equipment.

Hum, I got a set of the Canley CVs for the Spit that broke an axle and then 
rolled 4 times.
I have that car almost in one piece again and now you got me cautious?? A Spit 
vs GT6 is a lot of difference in weight and engine load though. Anyone got any 
thoughts?? I don?t want to go for that ride again. I am adding GT6 lower arms 
to keep the wheel form getting under the car, but still don?t want failure.


 <http://dieselperformanceparts.com>

Mark Craig
Diesel Performance Parts, Inc.
411 Allied Drive, Nashville, TN 37211
www.dieselperformanceparts.com<http://dieselperformanceparts.com>

  <http://dieselperformanceparts.com>




Phone: 615-834-0066
Fax: 615-834-9923




Sent: Thursday, March 22, 2018 9:38 AM
Subject: Re: [Fot] Rear Axle upgrade GT6

Scott & Mark.
I looked at my records and we show the CV joints that failed (yes it was me in 
the 5 laps) we purchased were from Rimmer Brothers (sp?) in England in the 
spring of 2016.
I can?t tell if they are the same guys or were resellers of the same product, 
but they looked identical to these units and I doubt there were more than one 
manufacturer of these in 2016.

And yes they failed, so I would NOT recommend for racing.

We compared the rear end system on our Kastner 1972 GT6 #6 and the Group 44 
1972 GT6 and reviewed the whole history with Kas, Scott, Craig Miller, Andy 
MacLaurin.
In the end we converted the Group 44 car to the Corvair Datsun solution as 
engineered in 1971 based on a set of engineering drawings Craig Miller had that 
had all the machining details.
Since that installation in Sept 2016 we have had no problems.  The Group 44 car 
runs a Quaife diff with Redline Shockproof 75W90 gear oil with this 
configuration.

Kas? 1972 GT6 runs a different outer hub configuration he constructed using 
Vascojet steel. Here is Kas?s note from 2016 ?We broke axle shafts and hubs a 
lot in the beginning and gave up on the normal steels available.  In the end I 
purchased a load of Vascojet steel that was prescribed by steel engineers to 
me, this is what is used in the outer axles of my GT-6. It was  expensive and 
hard to find and I bought all in the USA at the time about 200 pounds. I paid 
for forging dies and had the axles forged from this material. Now this was 
almost 50 years ago so inquiry of steels might be a hot tip.? Kas? solution 
provides an inner bearing retainer flange and nut at the hub carrier side of 
the axle, thereby preventing wheel loss in a failure. That car runs his 
original parts from 1972 and our last magnaflux shows no signs of failure or 
cracking.  As he says, Never Beaten by Equipment, even after all these years.

We had no trouble sourcing Corvair parts and GM bearings.


Date: Thursday, March 22, 2018 at 2:10 AM

Subject: Re: [Fot] Rear Axle upgrade GT6

I?ve seen one of those break after five laps in a GT6.


Canley in England has a CV axle set up for the Spits and GT6.

<image001.png>



MARK CRAIG
Diesel Performance Parts, Inc.
411 Allied Drive, Nashville, TN 
37211<https://maps.google.com/?q=411+Allied+Drive,+Nashville,+TN+37211&entry=gmail&source=g>
www.dieselperformanceparts.com<http://www.dieselperformanceparts.com>

<image002.jpg> <image003.jpg> <image004.jpg> <image005.jpg>




Phone: 615-834-0066
Fax: 615-834-9923




Sent: Wednesday, March 21, 2018 11:07 AM
Subject: Re: [Fot] Rear Axle upgrade GT6


Vince - I'm not sure that the TR6 axles would fit your GT6 because the bearing 
carrier for the Herald-based cars is a lot smaller than the TR6 is. I suppose 
you could make it fit, but you'd have to make a custom hub carrier. That said, 
I know that folks have done various solutions using stub axles from cars like 
the 240Z. The "trick" would be to find a hub flange that can be drilled for the 
Spitfire / GT6 bolt pattern and then work from there. And you can get brand-new 
stub axles for the 240/260/280Z.

Else, source something from the UK.

Also - do you have a GT6 Mk 2 or the early or late-late setup? That also makes 
a difference in the solution.

For my TR6, I run Corvair hubs like Group 44 did. But I had those hubs built up 
about 20 years ago - the Corvair parts are pretty scarce now. If I were to 
build a new car, I'd def. buy the Goodparts setup - he makes really excellent 
parts!

Regards,
Bob Lang


Good day all,

I am wondering if anyone has tried John Goods Axle conversion kit on their 
racing GT6?  It is a CV conversion but doesn?t replace the Hub which worries me.
http://www.goodparts.com/shop/index.php?categoryID=20

There are sturdier more complete TR6 kits but I?m not sure I could retrofit one 
of those.

Thanks for any feedback.

Vince

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