well...got it on the ground and drove it the "first 15-

yep, look here:
http://www.randysringandpinion.com/content/technicalhelp/default.asp?pid=122
without proper break in the gears will possibly get soft from the heat of initialy running them, not to mention the new bearings........and never tow with a vehicle with a new gear set for atleast 500 miles.....