I wish it was only a 15hp loss? You can reduce the loss some by using full synthetic lube. It reduces the drag on the gears. That's somewhere between 5 to 7 hp.
75hp loss is not really a big power train loss at all.
It's been pretty much documented on a dyno.
You would have to go to something like a VW Bug transaxle to get the loses that low.
I've seen the Corvair take the SB Chevy without breaking with the Crown Corveight kit. I can't believe the VW could.
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