DIFFERENTIAL MAINTENANCE
Q: My car model is 1998 Camry XLE. One month back I flushed the Transmission fluid and replace it with new fluid. Do I also need to change the differential fluid?
A: No, you don't. By 1998 they had integrated the differental supply with the A/T supply. Although the diff still has it's own drain plug, it is filled with the transmission supply. Differentials before 1998 have to be separately filled like a gearbox, only with ATF.
Just keep adding to the transmission supply until it reads normal.
That means bring the car up to temp by drving around the block. parking. Shifting through all gears & THEN checking the transmission fluid level with the engine idling.