A couple of possibilities come to mind.
I'm not sure how your filter installs, but if it connects above the fluid level, it could draw air if not sealed correctly. This would reduce the pressure needed to shift.
The second possibility is that the transmission range sensor is out of adjustment such that the transmission is in low 2 when you want it in drive.
SOURCE: 1995 buick century transmission trouble
Most likely causes is the OD shift solenoid or less likely the VSS
SOURCE: i have a 89 buick park avenue ultra. my
If the trans.oil is dark brown in color and smell's burnt your tranny is probably on it's last leg.If tou have bad pump pressure or low oil you will have to rev the eng to get it to build enough pressure to move.Your detent cable or kick down cable is for passing,when you step on the gas when passing someone this cable is pulled causing the trans. to go into a lower gear and when you let off the gas it should shift back into a higher gear.if it's out of adjustment it will kickdown to soon or to late.If your car has alot of miles it may be in need of a filter and fluid change,but usually when slipping occures its to late and you will need a replacement tranny.Hope this was helpfull.
SOURCE: 2001 Buick Century shift solenoid
It is in the side cover on the valve body. The transmission needs to be removed to access the solenoids.
SOURCE: front end of buick century shakes when accelerating
A lot of work & a pain in the rear if you don't have the right equipment. The biggest part is squeezing the coil springs and busting out the upper and lower ball joints. If you've never done it before I'd recommend taking it to a shop that has the pneumatic equipment to do the job. This is a real knuckle buster and worth paying somebody else to do it.
SOURCE: 2004 Buick Regal. Hard tranny shifts.
Try some Lucas Transmission fix. that stuff has done wonders for almost all of my tranny problems
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