I Have A 1982 240-d Manual 4 Speed. When I Shift Into Reverse The Gears Grind. The Gears Seem To Keep Spinning. It Doesn't Happen All The Time But Most Of The Time,so I've Gotten In A Habit On Shifting In Reverse Befor I Start Th Engine. Could My Shifter Be Out Of Wack. Is It Low On Trans Fluid. I Adjusted The Linkage And That Didn't Help. Please Help I Can't Knnp Shifting This Way, I'm Worried About The Trans.