[Mike Pearson]

I have had good luck with synthetic in my Dana. I have used 75/90w from Valvoline, Lucas, Mobile 1 all with good results. I literally get several thousand runs on a gear set with no apparent wear. The last gear I took out had at least 10 seasons and the gear was perfect. I changed ratio was the reason for taking it out. I do run the rear end full of lube. I did not find any ET in running a low oil level in the rear.