So i'm replacing input shaft and output shaft seals on a 92 w55 transmission, the two seals look to be of similar design, just different sizes. They have a flat side and a cupped side. The way the old ones were in there seemed odd to me. The input shaft seal had the cupped side out. The output shaft seal had the flat side out. I was told that i needed to replace both, but there didn't seem to be any leakage from the input shaft seal. Maybe i should have just left it, but i already bought the seals, so might as well, right. Does anyone know if one of my seals was backwards?