2002 X5 Tranny Problems Please Help!!!

[mdyer84]

Hi

Im having a few issues with my X5, the transmission has been showing signs its on it way out for 18 months, but having had to have one changed in the past I decided to just let it go until it went completely. Anyway so last week after a long drive it started slipping in second gear when pulling away at junctions and then the transmission failure warning came up. I left the car for a couple of hours and then it was fine again. A few days later it did it again but this time it didnt go away.

So i got a second hand unit from a breaker had it put in by my local indy picked it up yesterday and after 2 miles it started doing exactly the same again! Im gutted Ive spent £1200 and im back at square one.
I drove it again today in manual pulling away in 1st and then changing up to fourth and it was fine but as soon as i put it back in D it slips then I get a bang as i engages then "transmission Failure" and then it just sticks in 5th which by the way drives fine.

I ve looked on the net and cant find anyone with this problem! any ideas or opinions would be massively appreciated.