Good idea to know the condition of all fluids. Might as well think about servicing the differential fluid as well. Tremec transmission can use GM Synchromesh or I use Mobil1 automatic fluid. Differential fluid is gear oil, I use Amsoil. When I first got my car, the diff fluid was blue and horrible looking. I added Lucus additive, ran it 50 miles and changed it again 2 more times until clear.
'97 3.8L V6
1996 SVT Cobra White