are you looking for tranny oil or engine oil? transmissions use transmission fluid.. not oil and for that age of car any fluid will work you can get into the racing crap but your car is well beyond any true racing. look for ATF if your car is an automatic or a brake fluid is used for manual transmissions..
Is it an auto or manual trans different oils. AUTOMATIC TRANSMISSION FLUID TYPE D Valvoline. The higher price 15W-40W or cheapest 20W-50W choose any brand your choice engine oil.