Novak HV 4.5 system problems

[JThiessen]

I recently installed a brand new HV 4.5 system in my Revo. At the same time, I removed the diff's and filled them with 90W.
After putting it all back together, it runs great on the bench - balloons the crap out of the tires. However, when I set it down on the ground, it cogs and glitches like crazy - to the point that it wont run. I did manage to run a 30 foot loop with it, but it had the top speed of about half a stock emaxx.
I removed the front and rear drive shafts individually to see if one of them was binding, no luck. I then pulled the tranny (Emaxx with G-Maxx single speed conversion) to see if something was blown in there. Nada. (I took that opportunity to finally install the steel idler thats been in my tool box for a year).

I'm at my wits end, prior to taking it back to my local LHS (thankfully I bought from them, so returns shouldnt be an issue).

Any thoughts????