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[Fot] OD rebuild or T9 Trans. GT6

Subject: [Fot] OD rebuild or T9 Trans. GT6
From: sjanzen at me.com (Scott Janzen)
Date: Wed, 21 Feb 2018 20:00:59 -0500
References: <161bacbc1dd-7ab-217@webjas-vac034.srv.aolmail.net>
That?s because Steve led me through the conversion six years ago!

Sent from my iPhone

> On Feb 21, 2018, at 6:56 PM, gt6steve at aol.com wrote:
> 
> I'd like to reinforce Scott's excellent observations.  His is exactly what I 
> would've said if eloquent.
> 
> 
> 
> -----Original Message-----
> From: Scott Janzen via Fot <fot at autox.team.net>
> To: Vince G <vangoughv at hotmail.com>
> Cc: 'Friends of Triumph' Triumph <fot at autox.team.net>
> Sent: Wed, Feb 21, 2018 3:36 pm
> Subject: Re: [Fot] OD rebuild or T9 Trans. GT6
> 
> For the race car, you can keep it in the Triumph family by using a TR6 
> gearbox.  I have had this in my race car for five years now with no 
> racing-induced failures.  I have the close ratio gearset available from 
> distributors of Moss Europe, which is really much superior to stock.  Make 
> sure you or your assembler properly clearances the bushings however - I had a 
> spectacular third gear failure before the cause was determined when the gear 
> seized on the shaft.  The TR6 box is probably a 25 lb weight penalty, and you 
> need to invert the clutch throwout bearing fork, make a bracket to support 
> the slave cylinder in a new location, weld in a simple bracket to support the 
> stock TR6 transmission rear mount, and modify the driveshaft, and a few other 
> minor things.
> 
> Good news is, the gearboxes are widely available for very cheap, the close 
> ratio gears cost less than $1,000, a TR6 engine plate bolts right up to the 
> GT6 engine or you can drill one more bolt hole in the GT6 plate to accept the 
> TR6 box, and the shift lever is in exactly the same location.
> 
> Read your club?s rules - SVRA allows this, or did, some clubs say you need 
> the same number of forward gears, so you have the overdrive exemption that 
> allows a five speed, but some clubs, for example VRG, require that your 
> gearbox have the same external casting as stock, but internals are free.  
> 
> I happily traded vintage purity for reliability and a weight penalty, since I 
> was replacing gearboxes every other race weekend.  Now the weak link in the 
> driveline is the diff, which seems to fail every three years or so.
> 
> On Feb 21, 2018, at 11:46 AM, Vince G via Fot <fot at autox.team.net> wrote:
> 
> Seeing the recent discussion on Type A Overdrive I thought I?d take advantage 
> of this great knowledge resource and ask opinions on restoring my street GT6 
> OD that failed last year (worn out basically) versus abandoning the triumph 
> set up for a T9 retrofit while still available. 
> 
> What is anyone?s experience with regard to longevity of a Type A overdrive.  
> This is my simplest, lower cost solution (about $800) versus the T9 swap at 
> about $4000
> 
> Additionally I need to get my Track Car also a GT6 up to snuff.  I understand 
> there may be an option of having someone restore and upgrade  the current 
> triumph 4 speed versus me purchasing the T9.  In this case reliability and 
> operability are more important to me than keeping the car period correct. I 
> can?t afford the time or money to repeatedly swap out a weak transmission 
> that?s prone to failure like a stock box. 
> 
> Advice and Opinions most welcome. 
> 
> Thanks everyone 
> 
> Vince (from Ontario Canada)
> 69 GT6+  #144
> VARAC
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