[Fot] Rear Axle upgrade GT6

Thu Mar 22 09:12:42 MDT 2018

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.

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Mark Craig
Diesel Performance Parts, Inc.
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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<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.

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MARK CRAIG
Diesel Performance Parts, Inc.
411 Allied Drive, Nashville, TN 37211
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Phone: 615-834-0066
Fax: 615-834-9923
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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<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<https://linkprotect.cudasvc.com/url?a=http://www.goodparts.com/shop/index.php%3fcategoryID%3d20&c=E,1,PDilURj3wBlwr_Hsj9wYoJTVqPNFhhLjnQ2l9uRq20iH-PyWV9FVfAGoJ3JauneDX6VzE3_MBlSIHbL4ev-Wt5mtrUoqj9tEnLI478sVVfeZ_LGWuVy9GJiU&typo=1>

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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