1993 saturn sl2 downshifting by itself..automatic transmission..

does it do it at idle? if so... see if it has an idle air control valve if it does... replace

Issue with Relay Command..Due To low Oil Level ...Please check Oil Level on transmission May have To Flush Transmission Oil Change Filter and Re-ajust Relay Bank .... If you want to preserve your Transmission longer... Due To Over Sleping Band inside your Transmission Good Luck...

Ask at a wrecking yard, these guys know about interchange ability

IF 93 SATURN IT WILL TAKE DEXRON 3 AUTOMATIC TRANSMISSION FLUID.ALSO CHECK OWNERS MANUAL TO BE ON THE SAFE SIDE.

Time to find a much lower mileage used tranny and have it put in. Replace the clutch components with new stuff while you are at it.Note that the transmissions 91-99 will most likely swap but you must know whether you have an SL1 or SL2 and the donor car must be the same..

you have dirty cervo valves.Pour one pint of deisel fuel into transmission let run for approx.5 minutes.Drain all of fluid out.Change filter on front of transmission(it looks like a oil filter)replace fluid and that should take care of problem.

I have a 97 SL2 and it has the typical slam into reverse, but also after a couple minutes of driving it downshifts... It stays there for like 3-5 minutes then runs fine afterwards... What is the problem?

is this a manual or an automatic, either way it seems like a internal transmission problem

About the only way to drain transmission fluid is to take off the oil pan on the bottom of the tranny. There is no drain plug on transmissions.

Good luck

Saturn says and I quote

there transmission fluid is not to be changed after the first change at 6000 miles.

Now I say it should be changed at every 30000 miles. If changing out the fluid doesn't work then you need to go to a transmission repair shop.