Gear ratio

My buddy just put a 350 in his mazda bagged p/u and has an automatic transmission. He put a rear end out of a manual. He now turns about 3,700 rpm's at 60-65ish. Can anyone tell me if the automatic rear ends have different gear ratio's than the manual? Also, does anyone know what the ratio is on a manual rearend? I believe it is (rear end) out of an 84 pickup.

lol damn, thats not much of a freeway truck now is it... i know my manual is like 3000rpm @ 65-70. and its jus a 4 banger