yeah try out the lucas stabilizers for the differentail..make sure it's for gears not motor oil...I've used that stuff in my Acura and it really keeps the oil flow better/smoother...I've seen the additives work first hand..there was these two square containers with plastic gears inside and has a handle that you can crank to turn all the gears. One of the containers had only reg motor oil inside..the other reg motor oil w/lucas stabilizer...when you crank the one without the stabilizer, u can see the oil stick on the teeths of the gear and the gear itself, traveling upwards as the gears were set ontop of each other...the only bad thing is that the oil only travels up to the third gear-and not much oil is lubing that gear..so there's now two other gears with no lubing...

on the other hand, the container with lucas, when you crank it, oil travels all the way to 5th gear-quickly..