royal purple in 87 testarossa bad sounds

I run royal purple in my trans and it runs fantastic.. I tad puzzled.. It would take some time for the fluid to infultrate the system.. If the sound was immediate I would think that it is something else.. How many bottles did she take. Many of us run Royal Purple with no issues.. I have never heard that the fluid was too thin.. Who is the scientist that told you that.. The viscosity should be the same.. Maybe you had an additive in your tranny that was put in at previous fluid change to rectify some sort of tranny chatter.. How did you fill the tranny... Received PM, are you blaming me for this?

R

 

It's not too thin. IT'S THE SECOND NUMBER YOU NEED TO LOOK AT, 90.
If it's a full synthetic you can run a lighter weight. It flows better when cold and maintains it's viscosity at high heat better than Dino based oils.
Changing oil in your transaxle isn't going to magically create squealing bearings because it's 5 points lighter than the what you had in there before. You have something else going on in there.

BTW, I run Redline 75/90NS in my transaxle and shifts better than before. It shifted good when it had Shell in it to begin with. I used it in my 308 with great results as well.

I also run Redline 15/40 in the engine and as I said before It maintains it's viscosity at high heat better than Dino based oils. Being a lighter oil it is better than the heavier stuff at the lower temperatures that I drive my TR. 40 to 60 degrees ambient outside temps often.

The synthetic 40 weight is still heavy enough for the highest heat my engine might experience. The molecules "chain up" better than Dino oil and give better protection.

Try to localize the squealing noise. If it's on the front of your rengine it could be an idler pulley or your air pump clutch.
If it's on the back it could be your transfer case or throw-out bearing.
YOU DID REFILL YOUR TRANSFER CASE, YES?

 

I would flush it out then I put what you had in there... Some guys use Redline with the additive.. Shamile also flushed out some special shell fluid and he was sorry he did.. I think he was having a hard time finding that shell fluid.. Hope you correct your problem and we are all hear to help.. That was going to be my next question.. Transfer case full?

R

 

I heard that the additives are no good.. They make the syncros to slick and creates problems.. I am sure others with chime in..

R

 

NOT THAT I'M AN EXPERT.....................

The 'D' port is in the transfer case IIRC. If you filled through that and put 9.5 to 10 quarts in you are good to go. It flows through the transfer case and into the transmission. I waited for it to come out port 'C' in the back of the transaxle and closed it up.

FILLING THROUGH 'C' AND NOT PUTTING ANY INTO 'D' PER THE BOOK IS BAD. The other way around is okay because you are filling from a higher port ('D').

Not sure what additive you are talking about but the only one that is needed (in extremely small amounts) is a friction modifier for the limited slip differential. Put in just enough to keep the DIFFERENTIAL clutches from chattering when turning a tight corner.

If you put too much friction modifier in your transaxle the differential will work great but the car will be very difficult to shift, if at all..

I drained the Shell out of mine and replaced with the Redline 75/90NS which comes with NO modifier in the oil. Some do, double check. I did NOT add any modifier to mine because there was still plenty of residual left inside from the Shell. If the clutches in the diff start chattering I'll squirt an ounce in at a time until it stops. It shouldn't take more than a couple of ounces.