badblack97z28

ok so i just picked up a GM Sertified replacement transmission assembly. on the case is stamped 4L60e and 99 beside it. also there is in large black letters OLH. there is a green tag saying. does this tell me anything?

hydramatic
made in usa
OLH 07
code number
hydramatic
2018 089211

the guy had no info about it. it has the round electric plug. i have the 97 z28
thanks