I recently had my tranmission overhauled?? Initially, the torque converter had some cluch chatter. He added aditive to the fuid to get rid of problem.. The additive changes Dexron III to ATF4.... The mechanic put cam2 dexron III.
Should the mechanic have alreay put ATF4 into my tranmission in the first place??? My manual says to use ATF4 or type dexron....
I am not usre what to do... I can have him change it to ATF4... but what brand do I use... Nissan has their brand called nissanmatic D.

Please help...

john