SOURCE: 1995 jeep laredo overdrive is not shifting
Your overdrive should kick in at about 45mph, pretty much at or about 2000rpm. To see if it engaged, lightly touch the brake pedal and it will disengage.It should also disengage when you mash the pedal down to go into passing gear, and re-engage when conditions "normalize" again. You can tell that it has engaged because the tach will drop a few hundred rpms. If it's not doing this, a simple trans oil change (with filter) may correct the problem. OD is activated by a shift solenoid on the valve body that may be a bit gummed up.
95's show a shift control module on some diagrams I've seen, but not on others. I read this as a possible "half-year change" So you may or not have one. If you do, I'd check that as well!
SOURCE: 1993 Saturn SL2 will not shift into highway gear
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.
SOURCE: 2000 grand prix w/auto transmission wont shift into overdrive
some of the trannys has straps in them that sometimes needs to be tightened and that could be the cause of it
SOURCE: Rough Shifting in Automatic Saturn 02
change the fluid in your tranny, start looking for a different car. my advice: get a toyota
SOURCE: 1999 saturn sl2 transmission wont shift from 1st gear
Your valve body and possibly input shaft nut need to be replaced. The valve body's booster valve is worn down and won't create pressure. Before it went completely out it slammed on the input shaft nut and loosened it.
You need to replace the valve body and retorque the input shaft nut. The transmission is not junk. The above needs to be replaced and change the filter and fluid and do it every 20K miles.
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