Originally Posted by HK500Pilot

During a practice session yesterday I went to change my spur gear to the one pictured in the attatchment below. I found that the diff balls fit very tight in the holes and would not move like when the diff balls were installed in the stock spur gear.

What is the problem here? Do I need to use different diff balls or a different spur gear? Can someone provide me a link to the proper 72t 64p spur gear I can use with the stock diff balls?

Thanks a lot for the help!