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I had to replace the outdrive on my 2004 Cobalt 246 with a 5.7 280hp engine, which had a 1:95 ratio DP-S drive. I purchase a used one that was supposed to be the same but actually ended up as a 1:78 ratio. I had F6 props on the original drive and it turned 4800-4900rpm at WOT. I have the F6 on...