940 transmission problems

[Jakeness]

I have a 1995 940 turbo wagon, 4-speed automatic. Recently the 4th gear has randomly been disengaging itself, and the car has essentially become a 3-speed. I tried pushing the button on the shift **** but it won't re-engage. Has anyone else had this problem?

[brickrunner]

How many miles does the car have and when was the last time that the transmission fluid was changed? The first thing that I would do is check the color and level of the transmission fluid. The button on the shifter is overdrive so that isn't going to take care of the problem, in fact it will prevent the car from going into fourth.

[jagtoes]

Check your overdrive relay if it is intermittent or dead it will not get out of 3rd gear. Also take bricks advice and check/change the fluid.

[Jakeness]

Thanks for the replies. The car has just over 99K miles on it, but I'm not sure of when the last time the transmission fluid was changed. I'll check it first thing in the morning.

I'm beginning to think it may be an electrical problem and not a trans problem, because it will randomly go on and off for reasons I can't figure out.

Originally Posted by brickrunner

The button on the shifter is overdrive so that isn't going to take care of the problem, in fact it will prevent the car from going into fourth.

Actually, the button is how you select if you want fourth gear or not. It is essentially overdrive, though. When you press it, a light goes on the dash showing that it will not go into fourth. The same button can be pressed to re-engage fourth, so it was my first instinct when the light went on for no reason. It doesn't work, however.

[brickrunner]

It's probably your overdrive relay.