I figured it out..This is a 3 speed unit..
shifter has 4 positions ..low neutral direct and overdrive.
it is a Watson Trans Brown Lipe Gear Spicer model 43
Known as a "BROWNIE" Model 43 these were used in the 60's and alot were in the 2 to 5 ton trucks
This truck had the 17.5 wheels on it..so i guess it fell into the 2 ton class..
here are a few pics of the unit....before it gets cleaned up and put in the rollback..