Where'd you get that 38% number, I've seen it mentioned several times but Chrysler says "fully variable". 38% really doesn't make any sense, if the rear is on ice and front has traction it'll be 100% front.
I've been looking for more info on this transfer case, if you have any I'd appreciate it. For example I don't think there's any mechanism to pull power from/disconnect the rear. Mine never has, if the rear is spinning it engages the front but the rear keeps spinning unless I(or the car) pulls power. Is there even a differential in it, in what schematics I've been able to find I see no differential. Best I can tell it's really just a chain and a clutch. If so that would also mean it can never power/spin the front faster then the rear.