i hope u have a ford gearset, just makes it easier to setup the way ford set them up with the stock shims and more then likely quieter. 2nd id recomend changing out all the bearings now since ur working on it anyways. Most peoples 94,95 stangs have quite a bit of miles on them now. My car had only 111,000 miles and my rear end was quite noisy and the inner race was all gashed up. So id say its not a bad idea to change now. Also i dont know if u plan to change the speedo gear for speedometer correction but it seems my cobra already had the yellow 7 tooth outputshaft drive gear needed for a proper match with 373s. i took pics and need to clarify for others. and i know my car was never touched which is strange. Maybe only the gt came with the 6th or 8 tooth whichever it was.