Rear differential fluid

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ncktuley1
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Rear differential fluid

Post by ncktuley1 »

Im trying to figure out the correct fluid I need for my transmission & differential. I keep getting conflicting results, but does my baja have a rear LSD in it?
It's a 2003 sport, 5 speed. I was gonna buy a gallon of redline lightweight shockproof, but do I need to add an LSD additive to the rear diff?
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anarchy1024
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Re: Rear differential fluid

Post by anarchy1024 »

Everything I read online says, no, don't put in an LSD additive. Yes, you do have a rear LSD (from the factory, anyway), but it's a sealed unit. The gear oil isn't getting to the LSD-specific parts. You just use the same 75W90 oil that's used for the transmission.
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kamesama980
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Re: Rear differential fluid

Post by kamesama980 »

anarchy1024 wrote: Tue Apr 23, 2019 3:08 pm Everything I read online says, no, don't put in an LSD additive. Yes, you do have a rear LSD (from the factory, anyway), but it's a sealed unit. The gear oil isn't getting to the LSD-specific parts. You just use the same 75W90 oil that's used for the transmission.
This is correct. Even if you have a LSD, subaru uses a sealed viscous LSD. LSD additive is for clutch-type LSDs.
-Russell
"You don't get to judge me for how I fix what you break"
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05 turbo 5mt vf39 and other STI bits, 3" turbo-back
walfredo
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Re: Rear differential fluid

Post by walfredo »

+1 75W90
greymud
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Re: Rear differential fluid

Post by greymud »

This seems like a good place to ask a stupid question that's related.

I have an 050 MT with manual tranny. The tranny is also the front diff, correct? I'm planning on changing them out, just not sure I'm reading the manual right.
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HaHaBajAlcyone
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Re: Rear differential fluid

Post by HaHaBajAlcyone »

Yes, the front differential and the transmission share the fluid.
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