the 80% kit actually ties the spider gears together so it is closer to both axles turning at the same time.
The peloquin unit when I called the guy he said was actually a "torque amplifier" and it reroutes to the wheel with the most traction. It can be used with the 80% kit, which will help it achieve both axle spin. As is the peloquin unit will not spin both tires. If you jack up one tire and put it in gear it will only spin one...this is according to the guy selling them.
Wavetrac on the other hand is what I consider LSD and will spin both if jacked up, so be careful.