my escos box was rebilt about 4K ago (it was very tight when they had done it and it dragged a lot - it would move the car forwards even with the car out of gear when the engine started ) in the last 1K its developed a slight whine that can be heard from inside the car at first just thought the gearstick, this has now developed to quite a loud whine and can be heard outside louder than in the car.

its obvious it s box out job, but are there any common rebuild slipups that may have occured? its got the proper Mt75 oil in (castrol FMT) and there is no grining or banging, teh gearchance is lovely and smooth, its just this high pitched whine which gets louder and more intense as the car goes faster, it remains even when the clutch is pressed in when coastng at speed.