[Fot] TR6 Close ratio gear sets

[fubog1]

Another vote for these gears, they work fine, but I always recommend when doing this that you build up on a late 6 box, with a strong case & sync dogs etc and steel mainshaft bushes, or at least retrofit the kit that is sometimes available to convert the early boxes to steel bush.
Whatever you do, get rid of the brass tophat and keep the end-floats to a minimum.
Glen

 

 

 

-----Original Message-----
From: Scott Janzen <sjanzen at me.com>
To: Greg Blake <gblake58tr3 at icloud.com>
Cc: Fot <fot at autox.team.net>
Sent: Mon, May 16, 2016 4:49 pm
Subject: Re: [Fot] TR6 Close ratio gear sets


Matt Bakes at Triumph Rescue has built up a couple of close ratio boxes for me using a TR6 box to start.  Initially we sourced the gear sets through Ken Gilanders, but I think the primary source might be Moss Europe.  http://www.moss-europe.co.uk/shop-by-model/triumph/tr5-6/performance-tuning/clutch-gearbox-drivetrain/close-ratio-gear-set.html


1st = 2.19:1, 2nd = 1.57:1, 3rd = 1.23:1, 4th = 1:1



I've had no trouble with them whatsoever - though make sure everything is clearanced properly when the box is built!  It's great spacing from my perspective.
I use this box in my GT6 with 13" wheels and a 3.89 rear.  Need to slip the clutch around the paddock below 15-20 mph.  First gear at 6000 RPM is 47 miles per hour, if I did my math right.
With a fifteen inch wheel you would pick up another 9%.   I don't find there are any tracks except the Pittsburgh Vintage (city streets race) where I am in first gear, as I've got enough grunt in second for the really slow corners.  I think if you had a taller first gear or this combined with a taller rear end, you'd have real trouble getting the car moving/clutch issues, particularly if combined with a racing style clutch.


On May 16, 2016, at 9:07 AM, Greg Blake wrote:


I know this has been discussed before, but most of the threads I see in the archives are a bit dated. 
We had our first CVAR event at MSR Houston this past weekend and the need for a usable 2nd and possibly 1st gear were never more noticeable. Since we will no longer be racing at TWS the time has come for me to build a close ratio box. 
what are our current options to build a close ratio TR6 box. Even though budget does not allow for the dog box option, go ahead and list it so we have a complete listing. I am particularly interested if anyone has an option where 1st is a usable gear as well. 

Thanks. 

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