I just got my 4.30 gears, i was just curious on what kind of rearend gear lube everyone was using and if one was better than the other.

I'd just go with the royal purple. That's what 50resto.com sells in their gear install kits. Royal Purple seems to be pretty darn reputable as well.

I am happy with it. I have been running it in the IRS for a while and I bought it to go into the live axle as well. I run 75w140