What can cause hard shift 4th to 5th gear. went away when dsc flashing warning on 2000 Jaguar S-Type

hard shift for about a year then fail safe engine mode warning came on& went off, checked codes said throttle position censor & DSC codes &tried to clear. DSC would not clear then DSC amber flashing on dash and hard shift went away. flashing DSC would not clear. did recalibrate and cleared DSC but hard shift returned. 2 Transmission experts say not trans. had TPC replaced hard shift still present? Baffled

Asked by for the 2000 Jaguar S-Type
2 answers 2 comments
scan test it for codes
this was done
get a free diag and est from aamco then ck prices
aamco is the last place I'd go