I have just sold my last factory close ratio set. went overseas. I believe the jap kits are no longer available, but by all means, try.

I have had various ratio gears made over the years and it is possible to make up a kit .I have driven most of these versions and its real easy to get it totally wrong and have a disaster.

it will very much depend on what you are tyring to achieve. The race/rally kits were either 4 close packed gears with a HUGE jump to 5th., or 5 close gears with no overdrive at all. In all cases, 1st gear was taller to deal with a lower diff ratio.

email me direct at work if you want to take this any further. thanks