Can't find it ? It does not have one ! Only has a fill cap. Fluid is checked by removing a plug on transmissin. This is great job for GM dealer.
The transmission fluid dipstick for the Oldsmobile Alero does not exist. In place of the traditional fluid checking mechanism, the Alero has two caps. One of these is red, is located in the vicinity of the master brake cylinder, and is for refilling transmission fluid. The other cap, or plug, is 15mm and roughly halfway down the transmission. Loosen it carefully. If fluid comes out, the transmission fluid is good. If not, however, more fluid must be added.
I had a 2000 Olds Alero 4 cylinder. There is not a dipstick for the transmission, it can be checked by hoisting the vehicle and remove the fill nut/cap. If the fluid is at the top there is enough. I would recommend taking it to the shop for this, as I do not have the specifics of where it is located. I have a 2000 Alero v 6 engine automstic trans and mine is what they call a sealed for life transmission, it does have a filler cap but no dipstick. so the previous answer would be correct to check the fluid level and as long as u have no leaks from the tranny u shouldn't have to add any if little at all, Sincerely, TONY ,, Indianapolis, IN.