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
> On Mar 22, 2018, at 10:05 AM, DPPI - Mark Craig via Fot <fot at
> autox.team.net> wrote:
>
> 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>
>
> MARK CRAIG
> Diesel Performance Parts, Inc.
> 411 Allied Drive, Nashville, TN 37211
> www.dieselperformanceparts.com
> <image002.jpg> <image003.jpg> <image004.jpg> <image005.jpg>
>
>
> Phone: 615-834-0066
> Fax: 615-834-9923
> Email: mark at dieselperformanceparts.com
>
>
>
> From: Kas Kastner [mailto:kaskastner at gmail.com]
> Sent: Thursday, March 22, 2018 11:59 AM
> To: DPPI - Mark Craig <info at dieselperformanceparts.com>
> 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.
>
>
> On Thu, Mar 22, 2018 at 9:47 AM, DPPI - Mark Craig <info at
> dieselperformanceparts.com> wrote:
> 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>
>
> MARK CRAIG
> Diesel Performance Parts, Inc.
> 411 Allied Drive, Nashville, TN 37211
> www.dieselperformanceparts.com
> <image002.jpg><image003.jpg> <image004.jpg> <image005.jpg>
>
>
> Phone: 615-834-0066
> Fax: 615-834-9923
> Email: mark at dieselperformanceparts.com
>
>
>
> From: Kas Kastner [mailto:kaskastner at gmail.com]
> Sent: Thursday, March 22, 2018 11:29 AM
> To: DPPI - Mark Craig <info at dieselperformanceparts.com>
> 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.
>
>
> On Thu, Mar 22, 2018 at 8:12 AM, DPPI - Mark Craig via Fot <fot at
> autox.team.net> wrote:
> 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.
>
>
> MARK CRAIG
> Diesel Performance Parts, Inc.
> 411 Allied Drive, Nashville, TN 37211
> www.dieselperformanceparts.com
>
>
>
> Phone: 615-834-0066
> Fax: 615-834-9923
> Email: mark at dieselperformanceparts.com
>
>
>
> From: James J Dolan [mailto:jdolan at voyagerhldgs.com]
> Sent: Thursday, March 22, 2018 9:38 AM
> To: Scott Janzen <sjanzen at me.com>; DPPI - Mark Craig <info at
> dieselperformanceparts.com>
> 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.
>
>
> From: Fot <fot-bounces at autox.team.net> on behalf of Scott Janzen via Fot
> <fot at autox.team.net>
> Reply-To: Scott Janzen <sjanzen at me.com>
> Date: Thursday, March 22, 2018 at 2:10 AM
> To: DPPI - Mark Craig <info at dieselperformanceparts.com>
> Cc: 'Friends of Triumph' Triumph <fot at autox.team.net>
>
> Subject: Re: [Fot] Rear Axle upgrade GT6
>
> I?ve seen one of those break after five laps in a GT6.
>
> On Mar 21, 2018, at 3:19 PM, DPPI - Mark Craig via Fot <fot at
> autox.team.net> wrote:
>
> 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
> www.dieselperformanceparts.com
> <image002.jpg> <image003.jpg> <image004.jpg> <image005.jpg>
>
>
> Phone: 615-834-0066
> Fax: 615-834-9923
> Email: mark at dieselperformanceparts.com
>
>
>
> From: Fot [mailto:fot-bounces at autox.team.net] On Behalf Of Robert Lang via
> Fot
> Sent: Wednesday, March 21, 2018 11:07 AM
> To: FOT <fot at autox.team.net>
> 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
> On Wednesday, March 21, 2018, 8:44:11 AM EDT, Vince G via Fot <fot at
> autox.team.net> wrote:
>
>
> 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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