Read the reading: operators' manual, organizational maintenance manual, parts book, and lubrication order. Do you know where the transmission dip stick is and what fluid is in it ? I recall OE10 or Dextron were authorized but one or the other, no mixing. The air tanks need to be drained if they were numbered 1-4 top to bottom the correct sequence to drain them is 3.4.1. and 2. Pubs are available on the TM section on this site. Read them and be guided accordingly. Grease is cheap. Parts cost money.