Molybdenum Disulfide For Whining Diff/gearbox

[Rolls]

How good is this stuff, does it work and if so what product is best? I've read it is mainly used in extreme pressures eg the mating of gears not bearings.

My father said him and his mates used to use it all the time in their old flogged out cars/bikes and it was magic, though I'm unsure if this is just an old bs tale eg like putting a banana and wood chips in your diff, also with the advances in oil technology if it is now redundant.

Cheers.

[33GTRV]

We use molyb in cranes a fair bit, but in todays gearboxes (synchromesh engagement) id be hesitant to use the product. It does work well in road ranger and basically all dog engagement transmissions. Id be interested in the results, if its a last resort id say go for it. Cant see it harming it too much

[Simon-S14]

Try some nulon g70

[urtwhistle]

My dad swears by putting Molybdenum powder on every thing. But then again he hasn't realised that things have changed since the 70's. he even puts it in the engine oil. As much as I love the stuff I hate touching it cos the slightest dot seems to spread every where when you get it on your skin.

[MrStabby]

My theory for normal gearbox/diff is: buy good oil and it will already have right additives at the right concentrations, potentially including moly di. So putting more additive in will either have no effect, or can actually have a negative effect (but i don't know if moly di is one where it has a negative effect if you have a higher than optimal concentration). With a quality synthetic gear oil, you should never need to change the oil for the life of the gearbox.

However, it sounds like you're looking for a way of putting off a rebuild on a worn out part for a while, sort of like using lightweight shockproof in a gearbox with sloppy synchos. Here's something i googled:

Causes of Noise

The rear differential consists of many gears with their teeth entwined in each other. With so many moving parts, the precision with which they are arranged and oriented, matters a lot. If the lubricant levels of the differential lubrication mechanism have gone down or if the arrangement of the pinion and rest of the gears is messed up, then rear differential noise occurs. When the ring gear or the pinion is not adjusted properly, then the contact between the gear teeth is improper and causes friction.

In case the noise is ignored, friction will play its role and damage the ring and pinion permanently and lead to major car repairs. The humming noise will get slowly converted to a growling sound over time, resulting into large-scale damage. Sometimes, people confuse this with tire noise and ignore it. However, the subtle difference between the two can be identified, as tire noise varies with the kind of surface you are driving on, but rear differential noise doesn't change. Also, the noise occurs, only when the car is taking a turn. In some cases, the noise may even be caused while driving straight and accentuated during acceleration. Thus, differential noise can be produced, due to drop in lubricant levels or improper gear adjustments.

It is not recommended that you open up the rear differential mechanism and try fixing it on your own, as it is a complex job. Rear differential repair is best left to professionals. Car problems like these, need to dealt with immediately. So, if you experience differential noise at any point of time, the best thing to do is take your car to an automobile servicing center and get it checked as soon as possible. The car mechanics can make a better differential noise diagnosis. After about every 60,000 miles of running, it's essential that you get the differential and the entire drive train inspected for problems. Regular maintenance can solve such problems in advance.

Mostly, a boosting up of lubricant levels or a slight adjustment in the rear differential will take care of the noise. If you are delayed in dealing with the problem, then you may require a replacement of the entire mechanism.