Description
First, I will explain what happens inside to make the transmission engage 4th gear, then show the weak points, and finally how to use a pressure gauge to diagnose: https://mercedessource.com/store/1981-1995-7223-7224-modulation-pressure-test-kit-0
Link to 722.3 and 722.4 repair parts and video manuals: https://mercedessource.com/store/search?keys=722.3