I changed my tranny oil today with Redline 75W90 and I it is grinding when I shift to 3rd gear, whether shifting up or down. I used to get this before but not as bad as right now. This is the reason why I changed my tranny oil because I was expecting that will fixt the grinding but it looks like it made it worse. Any input on this guys?

 

Go put some Lucas additive in it. **** rocks

 

I had pretty bad grinding in most gears before I switched to Redline. Since then it hasnt happened again.

 

Stupid question but... are you sure you filled it to the correct level?

 

yup!

 

In my experience with redline tranny fluid, the shifts will actually become notchier at first. But after ~6/7 days, it starts to get really smooth.

 

yeah it supposedly takes some time to "set in"
i saw the lucas additive stuff on display, and it looks pretty cool, but i dont really know much about it. anyone got the "dirt" on it?

 

Consider this:

The Redline is a bunch slicker than regular mineral oil. If your synchronizers are worn, they may not work as well with the Redline as they did with the regular oil.

I put the Dyson oil in the trans and diff of my race car. I had a terrible crunch into and out of 3rd gear. After I changed it to Mobil 1, it was better, but not good enough. It now has regular oil in it and working fine.

The Dyson rep suggested I try this, so I would imagine he was more interested in my being happy with his product rather than just selling me the oil. It works great in the diff, and it will go back in the trans after I rebuild it this winter.

db

 

Did you use 75w90 or 75w90NS?

 

Here is my experience with Redline on the tranny and rear end on my NA.

Rear end - No problem what so ever
Tranny - Same situation as yours, untill the Tranny finally broke after 3 or 4 months.

My 0.02 cents!

BTW - Lucas Oil? That might be a good idea..........

 

I used 75W90 since MT-90 is not available and the manager at the store doesn't even know that there is an MT-90

Anywayz, so I should just wait for a few more days and see what happens.

 

um... there you go... 75W90 wheather NS or normal or whatever is not good for the brass syncros... empty the stuff...

refill with MTL or MT90... MTL is better for sub zero temps and MT90 for above freezing... check your owner's manual.

i had MTL in the tranny before.. ihad a slight grind into 3rd... when i drained the MTL it looked like new... then i put in MT90... no more grind... unless i'm rushing the shift into 3rd with a lot of force.

save the 75w90 for your diff... do u ahve a turbo? or normally aspirated rx7? if its NA then use 75w90NS.

if uhave a turboII or GTUs yse 75w90...

 

Mobil 1 gear lube has a very high sulfer content, which will eat your syncos. It should be avoided in trannies with brass like ours.

 

hmmmm.... r u sure about this? I've searched on this forum and according to some of the post, this type of oil should be ok with our cars

BTW, I have an 88 GXL. I also changed the diff oil yesterday with the same oil so I should be ok with that.

 

I never did care for Mobil1 GL5. It always felt notchy.

MT-90 is what you should be using. Definitely swap it out if you don't like the feel of 75w90. Don't wait.
I had a feeling you didn't use MT-90. Thats why I asked.
MT-90 is also a 75w90 and works great. MT-90 is a GL4 compared to the GL5, so you won't have to worry about the synchro issue that Icemark mentioned. Cheers is right. GL5 is best for your rearend.
You might have to shop around to find it or just buy it online.

MTL is best used in manuals that require ATF.
http://redlineoil.com/products.htm (print for manager too lazy to order you MT-90)

Can't find my GL4 vs GL5 link but this one explains it well(the guy lost a tranny=well enough for me )
http://www.motorvate.ca/auto/general/GL.htm

 

The manager of the store you went to was a moron. Dump the 75W90. You need MT-90 for the gear box. The 75W90 and 75W90NS are meant for the rear diff.

 

I have heard of a lot of problems with redline and none with NEO (sold by Mazdatrix). For that reason I went with NEO. More people use redline than NEO. That could explain the higher frequency of problems reported ect, but NEO feels great-just as good as the redline equipped cars I've driven and hasn't let me down yet.
I see no reason to use redline in place of it.

-Chris C.

 

I rock the royal purple 75w90. It's GL4 and GL5 compliant and doesn't eat syncros. I tried moble in my talon once and that tranny took a poop after a few months. Put royal purple in and it shifted smooth. When that trans finally shat out, my rebuilder said besides 3rd and 4th gear being shattered, the syncros and such looked brand new. Mind you this was a 400hp+ awd talon. Not exactly known for their drivetrain durability.

 

Weird how everyone has a different experience. My '88 SE had some grinding going into 2nd gear. Drained the 90wt, filled it with Redline 75w-90 NS and the grinding went away in a hundred or so miles. That was a year ago, and no problems since. Smooth as silk.

 

I've searched the forum again and it looks like I will really have to drain mine and put a new oil. I'll probably go with the Royal Purple since this is the one that they have in stock. Should I do ASAP because I am not gonna have time this week for my car.

 

TTT

 

Sure, if you want to use the RoyalPurple, give it a shot and let us know if you like it. It is labelled a Gl4/Gl5 and the website claims it is noncorrosive. I don't think that an instant change is required. But, don't put it off forever.

RoyalPurple-75/90 Max Gear. "Max-Gear® is a versatile, noncorrosive, EP gear oil that is test proven in race cars, boats, motorcycles and other vehicles to minimize gear wear. It excels in hypoid, positrac and limited slip gears in heavy duty as well as automotive and recreational equipment for rear wheel drive, front wheel drive and all wheel drive vehicles. Meets GL-4 and GL-5 performance standards. Contains Synerlec® additive technology."
http://www.royalpurple.com/retail/re.../maxgearps.pdf

Redline--75/90-- recommended for most street driven and racing differentials. Excellent performance in conventional and limited-slip units. Also for limited-slip manual transaxles which require a 90 WT oil. Contains limited-slip friction modifiers.

Redline 75/90'NS'-- recommended for manual transmissions and non-limited-slip transaxles that recommend 90 WT oils. Can be used in racing limited-slip units to increase lockup and reduce wheel spin.

Redline MT-90-- GL-4 gear oil designed for use in manual transmissions and transaxles. Provides excellent protection of gears and synchronizers and its balanced slipperiness provides a perfect coefficient of friction, allowing easier shifting.

Neo 75/90 EP Gl5, 75/90 HD (but not 75/90 RHD) meets the requirements for GL-4 grade even where manufacturers discourage the use of a GL-5 product. It is recommended for front wheel drive transaxle use where GL-4 performance is specified.

www.amsoil.com
http://www.synlube.com/prod03.htm
http://www.neosyntheticoil.com
http://www.royalpurple.com/retail/pr.../maxgear.shtml

I haven't tried Neo/Synlube/other quality stuff because it isn't available at the local speed shops or auto parts stores. I never care for buying fluids online. Its too much of an emply leaky bottle risk.
I have never heard of problems with any oil IF used as directed.
I did use royal purple xx140(only ..w140 synth gear oil in the area) once in a frontend of a car. It eliminated gear whine.

 

RE-A uses Red Line oils 75-90 for tranny.
For both street cars and GT Cars.
I use it, too.

JUN Auto, which is supposed to have the highetst technology in Japan,
uses NEO synthetic for all their cars.

 

i use straight 30w castrol in my tranny for quite a while now, haven't had a problem in that department. does anyone else use that?

 

This is a good thread to read. TTT