I think this is a false economy - all the time its whining, that's the sound of something wearing out. Probably the bearing closest to 6th, but all the time its whining its putting fine metal particles in the oil and they will be wearing out everything else, gears, hardened surfaces, other bearing races, synchromeshes, diff internals etc. The longer you leave it, the higher the bill will be in my opinion and the greater the chance of sudden failure leaving you stranded at the side of the road. That is how we advise all our customers and we usually rebuild 1 or 2 of these a week.
Thanks for the advice.
The problem is that seemingly I am the only one that can hear this whine, even my other half doesn't know what I'm on about.
She's not in the car anywhere near as much as I am so maybe that's understandable - the person using the car every day will detect any little difference in sounds that it makes.
The gearbox people say they've had situations where they've stripped a 'box down, rebuilt and refitted it, only for a noise to still be present and not connected with the gearbox.
They're obviously trying to avoid a situation like this again and having a disgruntled customer to deal with.
So it looks like I'll have to insist on the work being done rather than leaving it to the judgement of the experts.
Or get a second opinion of course, though I'm 99.9% certain it's the M32 playing-up. I can't see what else it possibly could be.
I've been given a quote for a worst case scenario so it doesn't particularly bother me about leaving it a while longer, though yes, I could well finish up stranded at the side of the road.
AA membership should help there.