First you need to look on your gearbox for a plate that has the gearbox code and also take note of what colour the plate is, when you have logged these you can cross reference them below.
AUTO GEARBOX OILS.
3HP22/4HP22/4HP22EH/4HP24 is Dextron 2.
A5S 3102(5HP-18) Black plate is Dextron 3, Green plate is Lifetime oil/Esso LT71 141.
A5S 3252(5HP-19),A5S 4402(5HP-24) is Lifetime oil/Esso LT71 141.
A5S5602(5HP-30) Black plate is Shell LA2634. Green plate is Esso LT 71 141.
GA6HP19Z(6HP19) / GA6HP26Z(6HP26) / GA6HP32Z(6HP32) is Shell M1374,5.
A4S310R(THM-R1) / A4S270R(THM-R1W) Black plate is Dextron 3. Green plate is Lifetime oil/ETL 704SE.
A4S200R(GM47) / A5S360R/390R(GM5), See label on sump, use either ETL8072B or ETL704SE oil.
A5S300J is Appolloil ATD D-3.