i am convert a glencoe ss united states model to rc and im looking for a reduction gear turns one motor into two shafts thats quite small

which model do you have. you can try and using two servo's as for motor's there small enough. Use a y hornest to control it on one channel. hope it helps

the 28 inch glencoe 1/400 its about four inches wide

what about the drive from a 1:350 Tamiya battleship? I know the Bismarck and Tirpitz kits have a 1 shaft in-2 shaft out gearbox and drive shafts if that helps

The Tamiya drive is a loose and incredibly noisy affair. But if you can find the Yamato version, it has 4 outs.

I'd go with separate servo drives myself, as I did on my landing craft:
http://www.geocities.com/patsmodels/lcm3/
Also look into the NWSL couplers.
Note- I have a single 6v 380 driving the stock 4 props on a 3 lb Yamato/Musashi, and it goes well over scale speed. You don't need a lot of power here. http://www.geocities.com/patsmodels/musashi/

If the servo motors are just a tad too small, you can use any small 6v motor (280 size) wired to the servo board. The bigger motor won't draw much current driving the small model props, unless stalled. Then a new servo board is only $9.99!
More on servo hacking at: http://www.geocities.com/patsmodels/servo/

Pat M

As an alternative to a gearbox, how about pulleys and good old traditional rubber bands?