[Stripit]

Have a 1999 International 4700 with the 300hp Allison. Right now it is getting ready to hit 70,000 miles. Have been using Rotella motor oil, and had the trans fluid changed about 3 years ago to synthetic. Wondering if changing the rear axle lube to synthetic would be of any benefit? I change motor oil at about 7500 miles, and have not switched that over. The motor does not use or burn any oil between changes.