sorry man, i was in a rush this morning when i posted that link...

i have fitted the funfactor optional 2 speed alloy hubs - both for 1st and 2nd gear, and they will fit the genesis 43 and 39 tooth gears. I am using the stock pinions at the mo -11 and 14t, although 2nd really needs to be a 15t - otherwise it strips the 14t pinion pretty easily.

i have the 15t on order - still... i have here what cen call the 2 speed 15t... but its identical to the single speed 15t, and wont fit the 2nd gear thread on the clutch - its the 15t for the assist clutch that i have ordered now, i hope that works... cen didnt reply to my post im afraid.

now i was concerned that the gears would be too high a ratio for my truck, especially with tmaxx wheels on, extra tranny weight etc. but i am pleased to say that with the os18, 25% nitro and an os pipe i just get away with it - 2nd isnt really needed now. it will still pull the frontwheels up, but only a little, bare in mind mine are heavier than stock wheels tho... i guess it gives a similar ratio to a 47t spur and a 13t pinion that the cen team used on their race mts, which is food for thought i reckon.

sorry im shaky on the 2nd gear pinion, i got the 14t to work 3 times before i stripped it - its like a warp speed effect.... scary, but addictive!

hope that kinda helps mate