[Fot] Rear Axle upgrade GT6

Thu Mar 22 11:05:16 MDT 2018

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

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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<mailto: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

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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/>

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Phone: 615-834-0066
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From: Kas Kastner [mailto:kaskastner at gmail.com<mailto:kaskastner at gmail.com>]
Sent: Thursday, March 22, 2018 11:29 AM
To: DPPI - Mark Craig <info at dieselperformanceparts.com<mailto: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<mailto: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.

 <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
Email: mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>

From: James J Dolan [mailto:jdolan at voyagerhldgs.com<mailto:jdolan at voyagerhldgs.com>]
Sent: Thursday, March 22, 2018 9:38 AM
To: Scott Janzen <sjanzen at me.com<mailto:sjanzen at me.com>>; DPPI - Mark Craig <info at dieselperformanceparts.com<mailto: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<mailto:fot-bounces at autox.team.net>> on behalf of Scott Janzen via Fot <fot at autox.team.net<mailto:fot at autox.team.net>>
Reply-To: Scott Janzen <sjanzen at me.com<mailto:sjanzen at me.com>>
Date: Thursday, March 22, 2018 at 2:10 AM
To: DPPI - Mark Craig <info at dieselperformanceparts.com<mailto:info at dieselperformanceparts.com>>
Cc: 'Friends of Triumph' Triumph <fot at autox.team.net<mailto: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<mailto: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<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
Email: mark at dieselperformanceparts.com<mailto:mark at dieselperformanceparts.com>

From: Fot [mailto:fot-bounces at autox.team.net<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<mailto: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<mailto: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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