Gear oil - GL-4 & LSD

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Gear oil - GL-4 & LSD

Postby AvivB » Tue Jul 30, 2019 4:31 pm

Hi everyone,

I'm adding Cusco LSD to my FWD gearbox and I'm looking for a gear oil that will play nice both with the gear synchros and the LSD.
From previous experience I know the GL-5 oils (or at least 4 out of 4 I tested) didn't play nice.
But now I cannot find a good gear oil which is both GL-4 and contain the extra ingredients for LSD.
Any recommendations?
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Re: Gear oil - GL-4 & LSD

Postby underscore » Tue Jul 30, 2019 6:00 pm

Could you use GL-4 plus an additive for the LSD? I know Chrysler makes an additive for the clutch packs in my Jeep diffs so I assume there are aftermarket options.
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Re: Gear oil - GL-4 & LSD

Postby 93celicaconv » Tue Jul 30, 2019 7:28 pm

Some have used a Red-Line product that they say works good with combination manual trannys w/synchro's and with hypoid gears. Otherwise, Toyota used to carry GL-5 Gear Oil Super (08885-02106), which was originally put into ST165's & 185's for hypoid & synchromesh transmissions - sold in 1 liter cans (at about $20/liter).
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Re: Gear oil - GL-4 & LSD

Postby sefiroxx » Wed Jul 31, 2019 12:24 am

Been running redline mt-90 for years with never a clunk and smooth sailing on my FwD.

Can't speak to the LSD impact though
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Re: Gear oil - GL-4 & LSD

Postby Magroo » Wed Jul 31, 2019 1:15 am

I've been using red line 75w90ns. A lot of subaru guys use the same and throw a bottle of red line lightweight shockproof and a bottle of synthetic gear lube for lsd.

Obviously the best choice is going to be the oem gl5 super but its expensive as frick. I think around $40 per quart.
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