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Old 02-16-2004, 01:44 PM   #1
Scooby Newbie
Member#: 27960
Join Date: Oct 2002
Location: VA
2003 WRX Sport Wagon
Aspen White

Default Trans / Diff Fluid question

Found this comment on red line gear oils

75W90 GEAR OIL - 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.

75W90NS - recommended for manual transmissions and non-limited-slip transaxles that recommend 140 WT oils. Can be used in racing limited-slip units to increase lockup and reduce wheel spin. Street-driven rear-wheel drive cars should use regular Red Line 75W90 or 80W140.

Looking for feedback on either version and any problems encountered like syncro issues.

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Old 02-16-2004, 03:59 PM   #2
Scooby Specialist
Member#: 19057
Join Date: May 2002
Chapter/Region: MWSOC
Location: The Lost Valley, Detroit, MI
2002 WRX
& Blue Ford & '72 CB350


First thing first-> SEARCH the TRANNY fourum.

All others aside....

I like a cocktail of fluids for my tranny. Here's the whole story.

0-13,000mi --> stock fluid no troubles, one TSD rally (brisk)

13,000 -- 46,000 mi -->DIFF - 3/4qt of super-heavywt shockproof; 75w-90 rest
TRANS - 3.4qts 75w-90ns, super-heavy wt shockproof to fill

At approximately 46kmi I changed the fluids again. atleast 2500mi of Brisk TSD rally and lots of "spirited" driving, no troubles at all whatsoever with the shift. (have to double cluch down into first, always had to even on stock fluids)

New Recipe:
After subiegal's testimony on the heavywt shockproof I decided I could use more protection.

DIFF- 100% heavywt Shockproof

TRANS - 2qts 75w-90ns rest w/ heavywt shockproof.

Now It still shifts great when hot, when cold however (as cold as -15F) you have to be really patient w/ the shift.

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