Manual F430 gear oil

I have a vintage V-12 with a transaxle. Several years ago I switched to synthetic LubroMoly GL5 SAE 75W-90 Gear Oil. I have had very good result with this gear oil, especially the 1 to 2 shift when the oil is still cold. Prior to the switch, I would have to shift from 1 to 3 before the oil warmed up.

 

Add modifier 1 oz at time until noise goes away

 

I just had a client with a similar issue. It was suspected the EDiff had an issue as he could not get the diff to be quiet. I disassembled it and found the clutch plates were dry of oil. As I removed the first floater plate, I could see the oil migrate across the disc. I cleaned it and soaked the discs in gear oil. I reassembled it and had no issues. I am told this car sat for sometime and this could account for the lack of gear oil on the disc. It could also be the trick oils they used trying to make it all better. I use Mobile One 75/90 LS. I haven't had any issues.

 

I should have noted.. after adding do a few figure 8s backward and forward in a parking lot to get fluid into diff plates

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I've had good luck running Motul 300 gear oil.

Limited slip differentials often require some level of friction modifier, otherwise they tend to operate like a spool or locked differential. I've had cases where I had to do just what Flash32 recommended, where you just have to keep adding 1 oz of modifier at a time until the chatter subsides.

Ray

 

We see this a lot and this is our go to stuff. One bottle will sort it out. Works great for the conventional differentials as well. Chatter is the biggest reason we went to the Shell 1099 fluid.

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The GM one works well too

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If you are going to change oil consider Ravenol vsg

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Order the Vsg .. you will be happy

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This answered the OPs question about his limited slip differential noise how?

 

I've been running Motul 300 with excellent results. I've also used their 300V (I believe it is) in my street bikes and shifting is silky smooth.

Go slow when adding friction modifier and give it some time to work its way around things. It's easy to add more, but there's no way to remove any once it's in there (even completely draining the gearbox or differential will leave some residue on the walls of the case, etc.).

Check the Motul website for specifics and make sure you start off with the correct product. Their website (and their technical support over the phone) are both top notch.

Ray

 

Motul 300 is what you want...

Valvoline is also top notch in my experience.

Some of the Motul products are also double ester based as I recall. You might want to research all that. The motul 300 is a very good gear oil and sticks to everything. It's a trip.

Ray

 

I did exactly this, with this oil. Took 2oz on my car.


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Better lubrication of the LS differential clutches. Modern synthetic gear oils are designed to work well with LSDs.

 

Resurrecting this old thread as I'm trying to find a good gear oil. Btw, the gear oil and rear diff oil is all the same in these cars, right?

Are y'all finding that with Ravenol VSG and Motul 300, no chatter even without friction modifiers?