G/box: 70 Auto: who is to blame

[jack taylor]

Hi, My mechanic spoke to The Braydon motor company of London to obtain an auto gearbox for my 1996 850 2.5 20v.He informs me that he gave Braydon the year, model, engine size and the chassis number. Braydon delivered an auto box which turns out to be for a 1998 V70 and this was then fitted.They assured my mechanic that this box was correct for my car. My mechanic didn`t check the part numbers before fitting the box. The end result is that it will not go into 4th gear. Braydon are not responding to my mechanics complaint and I have a gearbox that is no good. Experienced guys on this forum have said that I need a new gearbox control unit to match the gearbox.I am hoping that this course of action is the answer but if not I am looking at spending further money to get the correct box.
Braydon are at fault but should my mechanic have looked at the old box fitted to my car to obtain the part number or should he have given the engine number.One or both of them is at fault so before I start shouting at my mechanic what do you guys think please. Thanks Jack.