Differential
 

I have this differential in my ofna buggie.[link]http://members.cox.net/g.a.moody/diff.JPG[/link] The buggie is about 8 years old and it is a HODR. I was wondering if this type of diff is any good or should I upgrade to the newer ones like in the mbx or ultra comp. Also is the grease good for it or should I use some type of diff oil? I always here people talking about different weights of diff oil. Thanks for your help. Also if you want a better pic of the gears inside tower has them [link]http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXABA7&P=7[/link]