Somewhat normal, a good synthetic gear oil can help cut down on the heat, I found a 10-20 degree reduction on mine. But 2 cases is twice the heat of one case and they get hot, more so at highway speeds and when the outside temps are hot, the cases get even hotter.

r.c.brown@ieee.org
TruckEditor@tlca.org
Project: 4Crawler
4Crawler OffRoad - 4x4Wire discount code