tranny identity

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I just bought a 1976 chevy crew cab dually c30 camper special. It has what I believe is called a 3 speed with granny low. It has four gears plus reverse. Can someone tell me what kind of tranny this is and the gear ratios.

[loburb]

thanks a bunch. this thing has 4:10 gears 55 is like 3600 rpm. what is a journal design counter shaft, that will be the difference right.