This is our Standard Master Rebuild Kit for early Muncie M-20 and M-21 transmissions with 7/8" countershaft. Our kits include: Synchronizer rings, Case Bearings, all small parts,spacers, snap rings, needle bearings, strut keys and springs, countershaft, gaskets, bushings, seals, and all other necessary parts to rebuild your Muncie transmission correctly. Our kits are the best on the market and include high quality components. Priced right and a great value for the "Do It Yourself" mechanic.