Gearbox and diff oil

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Postby Denver_whiteST185 » Tue Mar 06, 2007 5:46 pm

after talking it over with the guy at the tranny shop, he recomended using a really good GL-5 fluid. im going with redline 75w-90 gl-5
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went back to the dark side of hondas!!!
(not really, i just own a completely UNmodified 91 civic dx that gets 45+ mpg now)
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Postby smog7 » Tue Mar 06, 2007 5:58 pm

Denver_whiteST185 wrote:after talking it over with the guy at the tranny shop, he recomended using a really good GL-5 fluid. im going with redline 75w-90 gl-5


im still looking for a auto shop that carries this stuff. where are you getting it from?
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Postby EVcelica » Wed Mar 07, 2007 12:26 am

I used the redline 75w90ns gl5 oil. got it off ebay for around 7.30 a quart. I also used redline 75w90 gear oil for the rear diff. I haven't driven it since I changed it though, its still winter :(
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Postby Denver_whiteST185 » Fri Mar 16, 2007 9:16 am

whats the difference in 75W90 and 75W90NS gear oil?

http://www.speedtoys.biz/index.php?main ... _id=412499
http://www.speedtoys.biz/index.php?main ... _id=412507

This stuff also looked really good too. i think someone mentioned it earlier
http://www.extremepsi.com/store/custome ... 130&page=1

Also, i searched though my Chiltons and couldn't find how much fluid would be needed?
^Ted^

went back to the dark side of hondas!!!
(not really, i just own a completely UNmodified 91 civic dx that gets 45+ mpg now)
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Postby EVcelica » Fri Mar 16, 2007 1:03 pm

Redline 75w90 gear oil has an additive for hypoid gears so it should be used in our read differential.

Redline 75w90NS doesn't have some additive that is bad for synchros and it is better suited for our trannys.

I used the 75w90ns in my trans and I'm liking it so far, shifts really smooth and feels strong.
Erik
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"THE" system
2005 Scion Tc "release series 1.0"
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Postby b00staholic » Sun Mar 18, 2007 7:30 pm

T-Trac,

You seem to know the most about these fluids that protect for both GL-5 and GL-4.

Can you recommend any specific brands of oil that have this specification?

Thanks.
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Postby EVcelica » Sun Mar 18, 2007 8:45 pm

From the redline website:
Redline 75W90 NS

This GL-5-type geal oil doesn't contain the friction modifiers for limited-slip hypoid differentials. This makes the transmission synchronizers come to equal speeds more quickly, allowing faster shifting and much easier low-temperature shifting. Can also be used in racing limited-slip differentials where weak spring design causes too much wheel spin.

Take it for what its worth talks somewhat about synchros.
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Postby Denver_whiteST185 » Sun Mar 18, 2007 9:59 pm

how about how much fluid i should get? im think i remember that i need 4 quarts for the transmission, but i would think i would need more...
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went back to the dark side of hondas!!!
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Postby EVcelica » Mon Mar 19, 2007 2:46 am

I read that it takes 5.5 quarts, but I only put in 5 quarts and it started leaking out the fill hole. I would get 5 and put it in until its full.
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Postby Denver_whiteST185 » Mon Mar 19, 2007 4:22 am

i think ill just buy 6 to be on the safe side and return the rest...
^Ted^

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Postby eddie_gt4 » Tue Mar 20, 2007 5:39 am

my choices are:

- Kroon-Oil Transmission Oil SP1011 for the gearbox
- Kroon-Oil Gearlube GL-5 80W90 for the rear diff

choices are made according to the Krooi-Oil site recommendation

for engine I'm using Kroon-Oil Emperol 5W40
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'96 Toyota Celica GT-Four ST205 - now
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Postby BriinumsBo » Tue Mar 18, 2008 10:34 am

T-Trac wrote:Use GL-5 Hypoid Diff Fluid in differential, do not use GL-4 in diff. Might as well just put water in it if you do!!
just my $0.02


how bad is it? The service put GL4 EP80W in both - tranny and differential..
ive driven about 1.5k miles and about 30mins of hard track driving. there are some moaning sounds that i dont prefer, but not that loud.
does it matter synthetic/mineral?
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Postby Hotrodhendrix » Tue Mar 18, 2008 2:02 pm

Nice read. If we can get some more specific brands that protect both we should sticky this thread.
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Postby Corey » Tue Mar 18, 2008 2:26 pm

I tried Redline 75W90 in the Diff, and 75W90NS in my tranny for ~15k km.

I dont have any hard data to show it was good or bad. Shifting was good, but by the time i drained the oil for a motor drop, The car had some 2nd gear issues. It didn't grind unless i upshifted after reving very high, it was just stuburn, especially while downshifting.

I double clutched the whole 15k km. And by the time I dropped the motor, double clutching was the only was to get it from 2nd to 1st in a reasonable amount of time (rather than holding pressure on the shifter waiting for it to pop in)

So, i'm giving Royal Purple a try in my ST205 tranny. Its hella expensive. 22$ retail/L, i got it for 12 :D The bottle says its both GL-4 and GL-5 certified.

I dont know if the degrading performace of the tranny was due to age or the oil. There was only 65k km on the tranny.

Royal Purple also makes Powersteering fluid.
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Postby Hotrodhendrix » Tue Mar 18, 2008 2:33 pm

Great info I will have to try the royal purple. I have been using it in the 3kgt and its amazing the difference it makes.
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