hi guys a newbie here!!

have a lovely 2002 3.2 xj8 sport with fjsh ad 65k
but here in south of ireland ...not many jag experts!!
last serv 6 weeks ago in main dealer...since have closed doors...credit crunch...nearest one is 3 hrs drive

just recent had "gearbox fault "up on screen....when you turn on jag first all is ok ..reverse is perfect but put her into drive and normally a few yards then" bang into limp/safe mode or else will only rev and then "bang"...safe mode(well you dont really get a bang ..just a lurch!!

any advice is welcome to avoid 3500 euro spend!!!!