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

by in Louisville, KY on September 15, 2013
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2 answers 2 comments
ANSWER by , September 15, 2013
scan test it for codes
COMMENT by , September 21, 2013
this was done
ANSWER by , September 16, 2013
get a free diag and est from aamco then ck prices
COMMENT by , September 21, 2013
aamco is the last place I'd go