Asked in Mercury Topaz
Mercury Topaz

What would cause 1990 topaz transmission not to shift from 1st to 2nd and drive until rpms are up to 4000 rpm?


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Assuming there isn't transmission damage, you probably have a kickdown cable. It's a cable that gets pulled on when you press the gas. It takes into account how hard your gas pedal is down, and delays shifting the closer you are to WOT. (wide open throttle) Perhaps it is a little too tight. Becareful though - if it's not the problem and you move the kickdown cable, you can damage the tranny if you make it shift too hard. So make sure you scribe a mark or something before you even touch it so you know where it was originally. There will likely be a bracket of sorts that allows minor adjustment.