Most DIYers will agree that overhauling a manual transmission requiring all the disassembly and reassembly of many small parts with precision measurements of the clearances that may need adjustments with select-fit spacers and select-fit snap-rings can be quite the task. A capable person can the remove the transmission and install the rebuild. However, it is best left to a professional repair shop to overhaul the transmission. After all, the time and expense of doing so will likely exceed that of a rebuilt unit from dealer parts departments or auto parts stores. Given the right tools and a methodical approach, a novice mechanic can rebuild a transmission. Essential tools for a rebuild include internal and external snap-ring pliers, an internal bearing puller, a slide hammer, a set of pin punches, a dial indicator, and possibly a hydraulic press. You will also need a sturdy workbench and a large vise or transmission stand. While disassembling, the arrangement and mode of fastening used should be noted down. Familiarity with the defective component makes it easier to inspect and replace the respective components.