2003 lincoln ls.... harsh reverse......transmission has been rebuilt & pcm has been reprogramed......

no
that will be problems with the TCM , VSS or TR sensors
an oil change for the transmission would also help
have the fault codes read by a professional auto transmission shop

Try changing the Solenoid Shift Pack

HPN-9L2Z7G391A

Was $515.30 / $332.20 five years ago, when I
did mine- on the 2004 L/S

If you have been using it- then you ruined the
transmission & it will have to be rebuilt

If so-- check the two case servo bores for wear & install
bushings if necessary & all valve body mods

What number is the radio fuse in my 03 Lincoln ls v6

No reason to replace a PCM behind the glove box

I have the same car, a 2004 V8

I replaced the One & only solenoid pressure control pack on mine

Having owned a trans shop in New Jersey years ago, I find your remarks
rather harsh

If they rebuilt the unit correctly , it should be fine & it should not have failed in 8 years,
if you changed the fluid every 30,000 miles, then what happened & why?

What were you told & why are you not back there?

Were updates done on the trans to correct the original problem
or any mention of a dealer flashing updates into the pcm?

Change the Tran Solenoid Pack

Remove trans pan, filter & 7 torx
screws & one 10mm bolt, on wire harness

Change the Solenoid Pack in trans

Speed Sensor Failed on the Transmission

usually shift kit makes for harder shift also verify engine is well tuned.

2003 lincoln ls harsh reverse...transmission has been rebuilt with new solenoid pack & taken to dealer to reprogram pcm!!!!!!!! wat else is left

You will have to have the solenoid body replaced in the tranny and have the PCM reprogrammed.