That would be On The Edge of Extinction. In US issues, anyway. UK numbering would make #75 part two of In The National Interest, one of Furman's many Dinobot stories that were rendered moot by Budiansky's inept treatment of the characters.
Anyway, that's the big showdown with Unicron story. Pencils by Geoff Senior, colouring, unfortunately, by Nel Yomtov.