Rear diff Lube

[SpooledupRacing]

turbo LSD unknown mileage I am going to be installing it in the car here in a few weeks I think but my question is what should I fill it with.

I was going to use redline (because I sell it) but I was unsure if you guys recommended something else.. I WONT use royal purple before u guys mention it.

[K-Tune]

...wait...you sell something and you don't know enough about it to decide to use it in your own car?

[87turbo_turtle]

i am not to sure of redline it has been pulled off the selves of the autoparts stores here...i hear royal purple is a good synthetic oil or oil replacement but i use either casrol 80w-90 or costal 80w-90

[SpooledupRacing]

Thats right I have read into Redline and I have heard of good stuff and bad stuff about it.

I have never used the redline myself.
Not only that but I know it works great in Saabs and other european cars however since I have no experience with it in an RX7 diff I figured I would to the correct thing and see what the rx7 community thinks of it.

just cause it works great in european cars does not mean it works great in rx7 diffs.

not only that but alot of you like royal Purple.. and I have done much info and analysis on it and have found I will continue to stay clear of the stuff.

And just because I sell it does not mean I stock it.. I sell LOTS OF PARTS and some of them I would not use on my car, but I know alot of people would.

[RotaryXperiment]

i would prob use it.
although i have used RP for both my diff and tranny on both my cars.

[SpooledupRacing]

yeah I will prolly use the 75w90 in the diff and the 75w90NS for the trans..

the NS is for non limited slip apps and good for transmissions.

[Kenny Senter]

how many qts?

how many for the diff and how many for the tranny?

looking to do this also.

[SpooledupRacing]

I will check tomorrow but I think its 2 for the diff and 3 for the trans..

something like that..

if u need any redline let me know..

[vincentrx7]

If you search on the otrher forum (RX7club) there is a thread on Redline vs NeoSYnthetics. BTW I read that the tranny is 3.8 qts and the diff is 1.2 qts. That thread was really pro Neo...,

[SpooledupRacing]

Yeah I don't use products I don't only because I want to be able to give my experience..

I know redline is proven in MANY cars, just wanted to see what RX7 guys thought of the product..

THX for all the info though.. atleast I know how much fluid I need to bring back home.

[prrex4ever]

I have used both Redline and Neo in both my FC and FD and I personally think Neo is better. I haven't had problems with either one but shifting seemed much smoother with the Neo stuff. Just my humble opinion.

[SpooledupRacing]

I appreciate that good sir..

currently I am more worried about the diff.. I am trying to get the Total mtl for the trans

[firzen]

Have you looked into Amsoil? I personally haven't run (on Redline right now) but alot of the mechanics and tinkerers I know swear by the stuff.

[SpooledupRacing]

No I sell Total (ELF) oil and I personally think it is FAR superior to other oils I have used and since I dont sell AMSoil I wont use it.

just my deal. If I dont sell it I wont use it. (fluids that is)

[lcrotaryracer]

2.6 to 3 qt for trans and a little over 1 qt for diff wen using lim slip tretment i know it for i did it my 87 and i work at advance auto i can tell you all the fluid capasts

[SpooledupRacing]

I have a little over 2qts in my diff that is from filling it on a chair before putting it in the car..

I plan to check the compacity later next spring before I start the car up..

[rx7 FC TII]

i used redline a few months ago. couldnt really tell you if theres a difference or not yet. i havent changed it and prolly wont need to for a good while.

[Trout2]

I started with AMSOIL in my FD's trans and rear then switched to NEO. Can't say any difference for differential performance but the NEO resulted in smoother shifting.

Jack

[prrex4ever]

I too have used both redline and neo in my fc and fd and neo seems to work better for me.

[RETed]

This thread is at least 3 months old.
Why are people talking about shifting when the OP was just talking about the rear diff???


-Ted

[prrex4ever]

Not being confrontational but, 1- share and exchange information, experiences and information with fellow rotary lovers. 2- keep site active, current and alive. 3- meet fellow car enthusiasts with similar likes and taste in automobiles, ie; network. You sir are right, my first post on this subject was about transmission shifting (totally irrelevant). My bad! My second post is about differentials. I hope that is ok with you, peace.

[pachizeron]

I have heard that redline is good but I haven't tried it yet. Anyway, why don't you try using costal 80w-90. Its very good.

[Max777]

actually, the recomended fluid is 75W-90 NOT 80W-90... there is a factory service bulletin that says to switch to the 75W grade if the customer complains of hard shifting in cold weather. also, there is a Redline Gear oil for hypoid gears, ie: differentials, and a Redline MTF, different grades of both. There is a specific Redline MTF that is geared for Mazda Transmissions. another thign to consider is the use of GL4 gear oil. From some reading I did, it seems like the GL4 stuff seems to work smoother than the GL5 stuff because the GL5 fluid is too slippery to properly engage the synchronizer blocking rings...(the brass/copper looking things that are part of the synchronizer assembly in your transmission)

Here's a pic:

http://lbcunited.com/earlyford2/images/SYNCHRONIZER%20ASSEMBLY%208M-7124.jpg

MT-90 75W90 GL-4 Gear Oil is what you want to use for the trans, not recomended for hypoid gears.

75W90 GL-5 Gear Oil is what you want to use for the diff.


Personally, I could not afford Redline right now, so I used GL4 compatible Coastal Gear oil, 75W-90 grade, this stuff is good for a daily, and cheap if you want to flush out your drivetrain before putting in expensive stuff.

http://www.redlineoil.com/Products.aspx?pcid=7


There, bam... I feel like a fuckin expert on redline oils now, they should pay me for this! :D

[Whizbang]

hmm that is interesting.

[Max777]

I dunno, all of it was fairly easy to find, Google search, evil forum search, and some light reading, calling people, etc...

I would just recommend going with a good synthetic, like Redline, Neo, or Amsoil... in a street car, I think any will be better than the average stuff on the shelf.

Oh, and All Data: http://www.alldata.tsb.com/home/ rocks when you dont have to pay for it! :D

[Whizbang]

once the FB stops leaking fluid everywhere, ill actually treat it to some nicer fluid in the differential. Especially considering the 4.78 gears and the tighter preload im using. Im still running synthetic but i have a rather nasty leak...

...as for my transmission, reverse is fooked, so i have to replace it soon enough anyway.

[Max777]

The rumor is that if you overfill your trans, the seals will leak like a mofo, so make sure not to put too much in.

http://www.aaroncake.net/rx-7/transfluid.htm

[Whizbang]

i havent overfilled anything. i actually havent really touched the transmission either. but the diff has a leak at the mating area of the 3rd member and the axle housing

[rx4ur7]

I have used SWEPCO in transmissions and rears since 1986 in all client and race cars. Never had a gear oil related failure in anything. Never had any oil on the ground issues like most synthetics.
I believe I posted else where on the site my experiences and other relavent information out this amazing product. For a street vehicle you will probably never have to change your oil again since SWEPCO's recommended service time for change is 10,000 hrs. They offer an oil analysis for their product recommended test time is every 3 years.
To check out more go to www.swepcousa.com.

[eyecandy]

I am sure I am late too this but I really like Neo Synthetic oil. I have used it my RX7 and IS300. I know NEO is heavily involved with the motorsports world, and Carbonetic now uses there oil for there LSDs.

[magpiemini]

For racing should I use a higher viscosity like 75-140?

No one has mentioned Valvoline GL5, is it good to use in the diff and transmission of a 1984 GSL-SE?

[cewrx7r1]

For the diff a good choice would be Amsoil Sevear Wear 75W-110.
For the trans Redline 75W-90NS is GL5 which is better than the GL4 MT90.

You have to consider that many of us are many a lot more power than the stock system.
Just as we need better cooling we need better lubrication.

[Rot]

Have you looked into Amsoil! I'm currently using it in my 85 gsl-se and 91 turboII. Both my trannys also (turboII both) Awesome oil no complaints. check your year S4 or S5. Amsoil GL-4(thinner) GL-5 (thicker).