Transmission wont downshift works manually???

[james125]

Hello guys Im working on a 1994 buick regal with the 3800, Transmission operates fine if you ease into it but if you punch it it seams to jump into third and stay there unless you manually shift it. transmission has had a recent fluid change and has 230k miles on it any ideas what would be causing it not to downshift?

[james125]

Just a update the car did have a new transmission installed 50k miles ago any ideas iv been doing research all day and haven't found anything no check engine not light on nothing just wont shift in auto.

Edited November 3, 2013 by james125

[rich_e777]

I don't know a lot about the transmissions but have you checked all your connections? Not just to be connected but old corroded connection can cause a lot of problems. Also check any vacuum lines and your transmission modulator.

[james125]

 

 

This is the only thing I found a broken vacuum line I cannot find out where it goes?

[l67ss]

Vaccum modulater? Possibly issues with tps?