[Fot] TR6 Close ratio gear sets

[Scott Janzen]

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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