Yes, you can add the approved fluid if it is low. Make sure you check the fluid level properly before you add any. With the tranny at full operating temp, car running and in park.

Only way it can be low is if it is leaking or if not enough was added at the last change. Are there any leaks on the tranny?

__________________
Ali Al-Chalabi

2001 CLK55
1999 Dodge Ram 2500 Cummins Diesel
2002 Harley-Davidson Fatboy
Merlin Extralight w/ Campy Record