I reckon its worth the money to at least diagnose it. You might get lucky and find it's a cheap fix, although it's unlikely.

At the very least, however, any potential buyer is going to do their homework on the worst case scenario (ie. new trans) and take that off the market value price unless you can give them an idea of what its going to cost to fix a diagnosed problem.

__________________
2005 3.0d Sport - Sapphire Black
Engine : Bluefin Superchip Tune,
Wheels & Sus: Style 168s (10.5s all round), H&R RDA Spacers, Bilstein B12, Eibach 40mm drop, Whiteline RSB
Exterior: Le Mans flares, 4.6is kit F&R
Interior: Dynavin N6, Blackvue DR650 dash cams

My Build Thread: http://www.xoutpost.com/bmw-sav-foru...run-sheet.html