1988 V20 steplift/305 chevy, mercruiser drive.

[spareparts]

The 1.5 HD gears were actually stronger, the 1.32 had too small of a driven gear. I had a customer that ran a 720hp Troy Dennis blower motor in front of an Alpha SS. he changed the lube every time out, never drag started it, rana duel shower and usally only ran other boats from 65 on. We had the 1.5 HD but ran out of prop options, ended up with 1.32 and a 27 Mirage(double cupped and labbed), biggest prop we could find with a rubber hub(pre plastic hub days), boat radared out at 101. I still put a fresh set of upper gears in every spring