Where do the check balls get placed in the valve body of transmission?

Eric, The TTC Torque Converter Solenoid is located behind the side cover which has to be removed to access. I will post links for you.
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http://i33.photobucket.com/albums/d61/bon2k/misc5/DSC01802.jpg

1997 Buick LeSabre TCC sensor location Google Search

Trans Troubles Hard shifting gt frothy fluid Drivetrain

98 Buick Park Ave Ultra 3800 Series II Input and Output Speed Sensor...

that will take a real isuzu full transmission FSM book.
or from the true maker, see that tag on the tranny?
it answer that. on most cars.
will say like Aisin mfg company model x. or ????????

there are 2 choices.

On the 1998 Town and Country, the neutral safety switch is inside the transmission . If you are not of the faint of heart, remove the bottom transmission pan and the lower valve body (do not loose any springs or little shiny steel balls), take the old one out and put the new one in and make sure to put the valve body in. The part costs around $50.00. A reputable shop will do it for less than $300.00.

Those are valve body check balls and they must be put back in the proper place for the transmission to function properly. Try not to panic. If you look closely at the passages in the valve body, you will probably notice that some of the them have small indentations beside them. If you find passages with this difference in the same number as the check balls, then install them and then install the valve body by lifting it straight up and carefully aligning it with the transmission housing before making contact with it. Good luck with your effort. I hope this information has been helpful and thank you for trying Fixya.com.

its inside the transmission and requires removing the valve body now this is where most people make the mistake and loose a bunch of little check balls dont and i mean dont turn the valve body upside down when you unbolt it and when you go to put it back on if your having problems with the check balls staying put try using a lil vaseline its tranny safe.

You could pull the trans pan and remove the valve body, and clean.

Not the converter,it is there to build pressure, to supply the valve body and apply fluid to clutch drums, that apply pressure on the clutches for each gear.

If you do remove the valve body to clean, you will need a picture of where the check balls go,when you replace it. Put assy trans lube or vasoline on balls to hold in place. Your working upside down unfortunately.

If the shift valves are free,no sediment, your out of options, unless a servo valve is hung up and doesn't apply a band. They out it comes,and you take it apart,to find the issues

Don't recall solenoids,other than for converter lock-up, back in 1989. Someone else may add to my theory.

you probably lost one of the check balls or put it in the wrong place in the valve body

Are you talking about check balls in the valve body?

you need to find it asap or you will have to re place the tran ok.