This looks like a good value for synthetic gear oil:<br/>Lucas Oil 10123: Synthetic Gear Oil SAE 75W-140 - JEGS High Performance<br/>I've read that many use 80w140. This is 75w140. Any opinions on whether that would matter?<br/>I've also read that the rear end takes about 4 gallons and each hub around a quart so it seems like the right amount.