Have to give credit to Team Extreme regarding this geared diff optional gearbox...
I sendt them a message asking if there was any optional gearboxes produced or for sale...
The respons was quick and positive, the day after they put it on the website
Super and inpeccable service.
Here is the link:
http://www.teamxtreme.co.uk/store/ve...ration-gearbox 
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Kyosho Lazer Zx5 Fs2 Sp WE
Kyosho Tf-5 Shin
Kyosho Rb5 Vega Edition Gen 2
Schumacher Cat SX3
Team Durango Dex 210
Spektrum DX3R-Pro
SAB Goblin 500
Logo 600 se
T-rex 550 V2 FBL
T-rex 450 pro (on steroid's)
Blade McPx BL
SAB Goblin 700 12S
Spektrum Dx8
Bergen-Norway