sujbaru baja rumbling sound going up hills
my subaru baja runs fine and check engine light is not on. It has 155000 miles on it. When going up a steep hill it makes what I would describe as a rumbling sound if it has to downshift a couple times and seems to be if the rpms drop below 2500. This is an automatic transmission. I have either stopped the car and turned it off or if near the top of the hill the sound will stop when road levels out. What could be causing it?