Got an alpha one gen 1 Trying to figure if I have a true 1.5 or a 1.47 ratio. My drive has apparently been rebuilt by a previous owner at some point because "rebuilt" is stamped in the case and the ratio number isnt there What number of teeth will the gears in the upper have for a 1.5? Number for a 1.47?

The uppers had a 24:22 and the lowers had 17:28 which comes out to 1.5097.the Gen II.s were 1:47 if I remember correctly.

The upper gears are the same. A lower gear change caused the 1.47 ratio. Since you have no choice in the lower gears, just think both as one and one half ratio. Just v-8 gears.
good luck

If i remember they no longer make the 1:50 when you buy new you get the 1:47,they are so close together you would no be able to tell the difference.