I have a 2005 Chevy Impala that shifts real hard I have changed my transmission twice and i"m still Getting the same problem.

the service manual and the tranny manual actual both show this.
and #3 the huge tranny parts houses all show your tranny and valvebody and the name of all sensor there.
3 ways to tell all by your self
but what transmission is this GM,, no engine told and trannies match engines max torque spec, 3engines that year and I can'ts it or read your VIN.
3.8L + super charged is it?
this has a 4T65E
box.
knowing that we can even google the box for parts www
just one fact known and not helpless.
correct name 1>2 solenoid
transverse tranny it is.
I have real manual on it (the box)
by make ATSG
THERE ARE 4 SOLENOIDS BUT JUST 2 FOR SHIFT.
THE COILS ARE ABOUT 20 OHMS COLD
COVER OFF TOP LEFT SOL IS 1>2
2>3 IS FAR RIGHT TOP'

BINGO, MY BOOK
4T64E

code p0753 refers to shift solenoid(SS) A-electrical===causes--wiring--shift solenoid--ECM/TCM
The fault is electrical as it is a solenoid ( an object that has a coil wound around a core in which a bar of steel is magnetically moved when the coil is energized This bar movement moves valves or locks bands or clutches)
Change the solenoid and check out the transmission control module(TCM).
changing the oil will be good for the transmission but will not fix the electrical fault.

If the transmission is full of fluid. please go here to read the problems with the pressure control module--http://repairpal.com/transmission-pressure-control-solenoid-failure-may-cause-erratic-shifting-593, Hope this helps, chevy impala pcm may cause erratic shifting.

He's back !!!

Inside the side cover on yours--- Jerry

No easy job- as sub frame is in the way, I
suspect

Need a trans shop

no on 05 chevy the transmisson shift is control by vacume look for a vacume line that is dry rooted or has come off start at the engine first then work the way down to the transmisson. a line off or dry rotted any where in the syastem will give you a hard shift sometiimes like a hard jerking motion when
shifting.

Have your transmission serviced which will include a filter change, fluid change and band adjustment.

Did you have it serviced or rebuilt, If you had it rebuilt I would take it back to the trans shop for warranty repairs.
If they just changed the trans filter I don't think it would cause your problem.You just have bad luck with the slipping trans

If your engine move either direction when you accerlerate or shift you have a bad motor mount or two.

Have the vehicle scanned. If you have a code in the computer for maximum adapt/ long shift, replace the EPC pressure control solenoid. This a real common problem on the 4t65e transmission.

SOUNDS LIKE STICKING VALVE BODY GO TO YOUR LOCAL AUTOPARTS DEALER AND BY A BOTTLE OF THERE SHIFTING HELP PRODUCT B&M IS GREAT STUFF AND AFTER THAT I WOULD WAIT ABOUT A WEEK AND HAVE TRANS FILTER CHANGE AND TRANS FLUILD TWO POSSIBLY EVEN HAVE IT FLUSHED