i was concerned with the housing being pretty HOT to the touch, after calling WillyMammoth (Mark) and emails from Zuk, i'm not going to pull the pinion, since i jacked up the drivers side and the driveshaft could be turned by hand and it fealt really smooth
more short trips around town 
Ya...it's normal for heat during break-in. It sounds like it's not a problem with too LITTLE ppl.
That old pinion had some nasty looking gouges inear the heel of the teeth!
ZUK
