best fiuld to use

1969 Dodge FSM

RESERVOlR
DO NOT add fluid to a reservoir until it is installed in its normal position in the vehicle. Adding fluid to the reservoir in a position other than its normal installed position does not allow for fluid expansion and damage to the reservoir may result.
Measure fluid level only when top is lowered. After filling reservoir, raise and lower top several times to expel air that may be trapped in system.
Insufficient fluid in the system may cause slow raising or noise in the pump and motor. Measure fluid level and if low, look for a leak due to a broken line or a loose connection. Fill reservoir (use only AQ-ATF Suffix “A” “Dexron” type transmission fluid).