It could be low on tranny fluid or could be ready to fail. It may also have a sticky valve. Take the dipstick out and smell the fluid. Does it smell like burnt rubber? If so then your tranny is shot and needs to be rebuilt/replaced. If it smells fine then go to your closest auto store and pick up some Lucas Transsmission stuff and see if that helps.
THIS IS A COMMON PROBLEM ON THE GM TRANS WHICH IS A BROKEN 1-2 ACCUMULATOR SPRING
One issue with a 2001 Chevy Impala hard shifting could be the pressure control solenoid. The car may also need something as simple as more transmission fluid.
super hard shifts
speeodmeter quit abs lights on transmission shifts hard
my 98 vw jetta atuo shifts hard in first but fine in 2,3
Mine has the same problem. The transmission guy said not to worry about it.
First thing to check is your fluid
I just had this problem with mine, and it was a loose nut on the linkage. There is also a brackett held on by the transmission pan bolts, they were loose too. After tightening all these up it shifts fine again now.
92 cavalier 31 clutch has to be on floor and still shifts hard
Check on the bottom side of the transmission for a plug that may have came unplugged. It will make it shift really hard if it is unplugged.
Perhaps transmission fluid is "breaking down" at high temp. Try changing fluid and filter
A hard shift isn't always hard on a transmission. When a transmission shifts soft, it has to slip clutches and bands which causes the friction material to wear out faster. But if this concerns you, have the transmission vacuum modulator valve and vacuum line inspected as this controls the shift firmness.