i used slick 50 teflon in my 944's transaxle gearbox, it cured the whine, in a way it was a shame cos the sound added to the "feel" of acceleration, sounded like a supercharger
, 50k later the box is still quiet and operates fine, that said in general i would agree with the above, additives seldom work i just got lucky.
My 3.0 gtv (2000, 55k) has a pretty awful gearbox whine, used to be just 3/4/5 and at higher speeds but now includes 6th (and probably 1/2 but more difficult to hear at lower urban speeds) and is across more of the rev range and increased speed band. The whine increases in volume as you accelerate, pauses initially as you lift off then whines again as the revs fall - like above, a bit how I imagine a supercharger sounds. At a steedy rpm the noise is constant.
I'd be very happy to lose this noise as its particularly irritating on long motorway journeys. I was wondering if anyone thinks using an additive would help in this case and if so is there any that you would recommend? Is the slick 50 good for all boxes? The last thing i would want to do is makes things worse through ignorance.
[Sorry i know nobody likes a long thread and i'll be grilled as this is my first post and i've probably already broken the rules but for further information the gearbox was rebuilt not long before i bought the car, not that i was informed of this at time of purchase but it was presumably because it spat the differential into the gearbox casing as i believe is relatively common. Routing through the paper work for the rebuild i found a note saying there is partial wear on gears 1-5, not that the dealer thought to mention it, though i guess there's an element of caveat emptor
that i have to take on the chin. I really wish i'd taken the car on a more lengthy test drive prior to purchase because i'm sure i would have noticed the whine - still live and learn.
Also having had another mechanic look at the car he's suggested there's a leak between the engine block and gearbox which can't be helping and i do wonder whether the whine is worse as a result of a less than full box - obviously the dealer says "they all do that, sir, a minor weep is really nothing to worry about
" and they can barely hear the noise. Clearly intermittent deafness must be common in those trying to fob you off.
You wouldn't mind but when you've just paid at least a 50% premium to buy a car from a dealer claiming to be the UK's leading independent Alfa Romeo specialist, based in North London, beginning with V, i had hoped for a little more.
Good to get that off my chest but the point is that you may say I'd be completely wasting my time with an additive because what i really need is a new gearbox!]