[83C]

I own a 83 swb and from factory it came with a 250 I6 and a 3-speed with overdrive manual transmission. I am trying to figure out what gears I have in my rear axle. The only information I have is from the Service Parts Indentification card. The option # is GQ1 and the description is Rear Axle - Standard. Can anyone tell me if I can find out the ratio with this information? I am putting a 350 engine with a 700r4 transmission and I want to find out if I can use this rearend or not.