do you have a picture of the rear axle? it seems highly unlikely to have both a brownie AND a 2 spd, unless one of the 2 isnt original. id like to see the brownie too, just for the sake of it. someone might be able to ID it on here. there is a wealth of knowledge on brownies available on this board, and there were very few 2 spd axles used, so that shouldn't be difficult to identify. i would definitely keep it, if you have enough space, they're good trucks.