The transmission slips in my 94 topaz

Question edited for clarity.

All your issues can be solved by an auto electrician or a transmission specialist with a $5k pro grade scan tool computer. TCM or solenoids. It is an electronic issue.

Drive it slowly to a reputable transmission shop. There is nothing you can fix yourself.

Is it over filled?

You cold try cleaning the valve body

I guess you have a modulator,is that
leaking fluid,pull of vacuum hose & check

For Automatic transmission problem,Check the list of help links below.click the link below:----Automatic transmission troubleshooting:----

http://howtobyme.blogspot.com/2011/11/automatic-transmission-will-not-go-into.html

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Automatic transmission shift lever issues?-------

http://technoanswers.blogspot.com/2012/01/automatic-transmission-shift-lever-hard.html

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AUTOMATIC TRANSMISSION FLUID LEVEL? --

http://schematicsdiagram.blogspot.com/2011/07/how-to-check-automatic-transmission.html

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AUTOMATIC TRANSMISSION FLUID AND FILTER?

http://schematicsdiagram.blogspot.com/2011/07/how-to-change-automatic-transmission.html

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Transmission fault light on car dash?

http://schematicsdiagram.blogspot.com/2011/12/transmission-fault-light-on-car-dash.html

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Transmission shifting problem?

http://schematicsdiagram.blogspot.com/2012/01/transmission-shifting-problem-on-toyota.html

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Transmission Slips out of 2nd gear?

http://repairhelpcenter.blogspot.in/2012/02/transmission-slips-out-of-2nd-gear.html

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OD light flashing and transmission fluid leaking?

http://repairhelpcenter.blogspot.in/2012/02/od-light-flashing-and-transmission.html

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Why Transmission fluid leaks near radiator?

http://repairhelpcenter.blogspot.in/2012/02/transmission-fluid-leaks-near-radiator.html

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transmission fluid leaking?

http://technoanswers.blogspot.in/2012/02/ford-windstar-transmission-fluid.html

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****** wont go in reverse?

http://technoanswers.blogspot.in/2012/02/dodge-neon-wont-go-in-reverse.html

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Automatic transmission will not go into reverse?

http://technoanswers.blogspot.in/2012/02/dodge-automatic-transmission-will-not.html

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Transmission is making buzzing noise?

http://technoanswers.blogspot.in/2012/02/transmission-is-making-buzzing-noise.html

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This will help.

Thanks.

I say band adjustment in transmission, have done by shop. might be just a vacuum hose or modulator, but I don't think so

look at the top of your transmission near the shift cables and there should be a large bolt-looking fitting with two wires coming out of it and a plug on the end. Disconnect this plug, then place a wire across the iside terminals of the plug coming from the body, not the trans. Check the lights then and if the are on, you have a bad reverse light switch. Hope this helps :)

Suggestion try to check if the release bearing of the transmission is still ok and check also the transmission oil level and if you need to change the transmission oil.

I’m happy to assist further over the phone at https://www.6ya.com/expert/ramy_d9e7ebea3891f482

IHave the pan dropped and the filter check/replaced and the sediment evaluated.

It just holds 2nd forever. Is the 1-2 shift point high?

It sounds like the reverse band is out of adjustment. Three things can cause this, reverse band, front clutch and the overdrive direct clutch. To test the band, drive the truck in manual low up to 25 mph. Then let off, if the transmission doesn't pull the engine down, the band needs adjusted. If the front clutch is the problem, 3rd gear will be act weird too. The only test I know of for the overdrive direct is to inspect it, so process of elimination will have to work. Hopefully the problem is the band, because you can pull the pan, service the trans, adjust the band, and be done. Any of the other problems and you are looking at a rebuild. Good luck.