Trans fluid change... now LSD chatter

[destrux]

I changed my trans fluid yesterday. I used Amsoil full synthetic GL-4 75W-90 Manual Transmission Fluid. Now when I get in it for the first few sharp turns I make when the trans is cold I hear some groaning and slight chatter from the limited slip differential. I noticed the factory oil smelled like it had Ford motorsports friction modifier(LSD additive) in it (that stuff has a REALLY distinctive smell, once you smell it once you never forget it). I know everyone has been using redline MT90 (I couldn't get it at short notice, and I have used Amsoil in other stuff with excellent results)... but has anyone been adding any sort of friction modifier or LSD additive in the transmission?

 

[funksilver07]

Just swapped my tranny oil to MT-90 no additives and no noise. Haven't noticed any additional noise after the change... (uhm)

 

[mazdaspeed32007]

same...just swapped mine for the second time...nothing. none on sharp corners, launches....nothing. hmm.

 

[matsuda]

I know everyone has been using redline MT90...

Some people are using RP Max-Gear 75W90 which does contain friction modifiers.

 

[Mazdanspeed]

Has anyone used royal purple synchromax?

 

[jengajoe]

You should try adding a bottle of Amsoil Slip Lock
http://www.amsoil.com/storefront/ada.aspx

 

[irnbru83]

Should just never change the tranny fluid.

 

[nostrazoomus]

I noticed some chatter after changing to MT-90. Not to bad, but enough to be irritating. Added about 4 oz of modifier and no more noise.

 

[matsuda]

Has anyone used royal purple synchromax?

That would be a disaster.
Synchomax is a replacement for ATF.

 

[Nliiitend1]

Motorcraft XT-M5-QS.

/thread.

 

[Darth Vader]

Just chucked in 4 oz of Ford friction modifier, as the PO put in Redline MT-90 and left me with the noise. Noise now gone, even shifts a touch smoother.

Now, on cone-style diffs, noise = wear, period. These items are also non-rebuildable, unlike a plate limited slip. So you're aiming at replacement not repair, down the road, likely big $$$.

I don't care about noise and chatter on my 5.0 drag car but not on my DD, thanks.

 

[dizzin9]

ok, so u put amsoil MTF (fluid) and not MTG (lube)?

 

[///M Compact]

Motorcraft XT-M5-QS.

Exactly!

 

[destrux]

Sorry, it was Amsoil Manual Transmission & Transaxle Gear Lube GL-4 75W-90(part number MTG-01). After thinking about it for the past few days, I really don't want to try mixing any additives with it. I don't mind trying out homebrew fluid mixes in my DSM with the $30 junkyard transmission, but the transmission in this car costs more than my whole DSM does.

I couldn't find it using the search on this site... but I found this thread searching google.... http://www.mazdas247.com/forum/showthread.php?t=123728011

I'm going to try some of the Ford XT-M5-QS. I've heard the best results from people using that. It's also probably what came in the car, or damn close to it.