I think that depends a lot on the drivetrain, but I've heard anywhere from 10% to 20%. That would be crank vs. rear wheel hp. There's a rear wheel dyno place just a few blocks away from the new pad, and from what Madcap racing has told me, their a "tuner" joint. Can't wait to take Orangezilla there, lol! I would imagine that the full time 4WD on the '74 RC would be 20% to 25% with the front drive shaft dropped and the transfer case in 4WD lock. Most likely much less on a 2WD A-body with synthetic lube in the rear end, a 904 and a 8 1/4. Less yet with a synthetic lubed manual trans.
