If you've got it out, it will say on the little tag that is under one of the bolts. Tell you ratio and if it's track lok it will have an L where a decimal point would be, if its no there wil be just a blank space there I believe.
Former owner of 94 Bird with DOHC 4.6L swapped from a mark VIII
2011 CTS-V Wagon
1968 Torino was an original 289, C4, fully documented numbers matching car. Now: DOHC 4.6L/T-56 swapped, Cobra intake, IMRC delete, BBK long tubes and H pipe. Dynotech Aluminum Driveshaft, 9" rear with TrueTrac and 4.11's.