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Old 07-08-2005, 12:21 AM   #1
slingshot
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Default STi Front Diff-filled fluid, diff slipping?

I checked my front diff fluid level, it was below the low line.
So I added just under a quart of 90-weight, as per the manual.

Now the car doesn't seem to pull as hard out of corners.
For example, when I gun it out of my complex parking lot (left turn onto a 4-lane street) the car normally wants throw me out of the seat.
Now it feels softer. It almost feels like the clutch is slipping, but it's not.

Is the center diff fluid supposed to be low? Or did I just overfill it?
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Old 07-08-2005, 01:21 AM   #2
Uncle Scotty
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.....and what
Quote:
90-weight
did you use???
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Old 07-08-2005, 11:07 PM   #3
slingshot
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API GL-5 80w90. That's what the owner's manual said to put in it.
I'm assuming the previous owner had regular gear oil in it. Maybe I should give him a call and make sure.
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Old 07-09-2005, 12:25 AM   #4
Uncle Scotty
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Quote:
Originally Posted by slingshot
API GL-5 80w90. That's what the owner's manual said to put in it.
I'm assuming the previous owner had regular gear oil in it. Maybe I should give him a call and make sure.


What brand????and what particular type of oil??????
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Old 07-09-2005, 01:41 AM   #5
slingshot
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Default

Quote:
Originally Posted by Uncle Scotty
What brand????and what particular type of oil??????
Not sure what brand. It's at work, I'll look at it tomorrow.

It's non-synthetic API GL-5 80w90 hypoid limited slip gear oil.
The manual didn't mention any additive, and I figured since the front diff had a dipstick, it's probably sealed off from the rest of the trans fluid.
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Old 07-09-2005, 07:43 AM   #6
turbo2ner
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You can't chnge the center diff fluid. The tranny fluid sound good to me. You are just crazy, I doubt adding a little gear lube will slow down car.
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Old 07-09-2005, 07:45 AM   #7
turbo2ner
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What type of front diffs do the 04 STi have? Viscous? If thats the case, you don't need the limited slip additives.,
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Old 07-09-2005, 09:37 AM   #8
slingshot
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Quote:
Originally Posted by turbo2ner
You can't chnge the center diff fluid. The tranny fluid sound good to me. You are just crazy, I doubt adding a little gear lube will slow down car.
I meant front diff.
Maybe it's just my imagination.
Quote:
What type of front diffs do the 04 STi have? Viscous?
No, it's a suretrac diff...gearless mechanical limited slip. But the book didn't mention any additive.
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Old 07-09-2005, 11:13 PM   #9
tcam33
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Quote:
Originally Posted by slingshot
Not sure what brand. It's at work, I'll look at it tomorrow.

It's non-synthetic API GL-5 80w90 hypoid limited slip gear oil.
The manual didn't mention any additive, and I figured since the front diff had a dipstick, it's probably sealed off from the rest of the trans fluid.

The front diff and trans share the same oil. I believe the recommended weight is 75w90 GL-5 for all temp conditions
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