[Fot] TR6 gearbox rebuild

[Larry Young]

Greg, you did not mention what ratios you have. During my short racing 
career I tried numerous gear combinations. 20% jumps seem to be about 
right for the upper gears in our cars, which is what a standard A-type 
overdrive gives (22% or 0.82). The standard gearbox ratios give about a 
30% jump between 3rd and 4th, while the close ratio gears are closer to 
20%, so standard gears give a 3rd overdrive which is 10% lower than 4th, 
while with a close ratio box they are essentially the same. The 
advantage of the overdrive is to give a useable gear between 2nd and 
3rd. I don't see how you can improve on the combination of an OD and 
close ratio box with a 4.55 rear. I found it useful to have two ways to 
get the same gear because sometimes it is easier/quicker to shift the OD 
rather than the transmission. Everyone say overdrives are temperamental 
and add weight. I never found mine to be a problem and a small 
improvement in gearing can easily make up for the extra weight.

The alternative OD ratios I've seen are larger than 20%. You'd have to 
go to a very large OD ratio to get a useable 3rd-OD which is between 3rd 
and 4th. Some of the alternate OD ratios are probably better for highway 
cruising.

On 11/15/2021 5:10 AM, Enquiries Road & Track via Fot wrote:
> there are several different overdrive ratios, you need to change the 
> sun gear , annulus and 3-gear set
>
> Terry
>
>
> On Mon, Nov 15, 2021 at 11:24 AM Bob Kramer via Fot 
> <fot at autox.team.net> wrote:
>
>     JK Jackson had that all figured out for a non overdrive box with
>     the goal to get a better 2-3 spread.
>
>     Sent from my iPhone
>
>     > On Nov 14, 2021, at 6:36 PM, Greg Blake via Fot
>     <fot at autox.team.net> wrote:
>     >
>     > I’ve been inspecting the gears I took out of my race car.
>     Second gear appears to have the slightest blue tinge to its color
>     now. Is there a way to check if there is some damage caused by
>     over heating?  Everything seems good from a tolerance perspective,
>     just concerned about the slight blue color.
>     >
>     > Related note. Is there a combination of gears I can use out of
>     different gearboxes to give a better split between 3, 3OD, and
>     4th?  Right now I just skip 3OD because it is very close to 4th. I
>     have a ton of gearboxes laying around, so if there is a
>     combination I should try I’d love to give it a shot.
>     >
>     > Sent from my iPhone
>     > _______________________________________________
>     > fot at autox.team.net
>     >
>     > http://www.fot-racing.com
>     >
>     > Donate: http://www.team.net/donate.html
>     > Archive: http://autox.team.net/archive
>     http://www.team.net/pipermail/fot
>     > Unsubscribe/Manage:
>     http://autox.team.net/mailman/options/fot/rkramer56@gmail.com
>     >
>     >
>     _______________________________________________
>     fot at autox.team.net
>
>     http://www.fot-racing.com
>
>     Donate: http://www.team.net/donate.html
>     Archive: http://autox.team.net/archive
>     http://www.team.net/pipermail/fot
>     Unsubscribe/Manage
>     <http://www.team.net/pipermail/fotUnsubscribe/Manage>:
>     http://autox.team.net/mailman/options/fot/enquiries@roadandtrack.net.au
>
>
>
> _______________________________________________
> fot at autox.team.net
>
> http://www.fot-racing.com
>
> Donate:http://www.team.net/donate.html
> Archive:http://autox.team.net/archive  http://www.team.net/pipermail/fot
> Unsubscribe/Manage:http://autox.team.net/mailman/options/fot/cartravel@pobox.com
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://autox.team.net/pipermail/fot/attachments/20211115/7045ff0d/attachment-0003.htm>