Topic: Rear diff w/ LSD and Auto trans fluid?

[ophidia31]

Going to be doing the engine oil within a month or so and was going to change out the rear diff and trans fluid while Im at it. Already going to use amsoil for the engine since thats what Ive used for years, but what is the stuff to use for the two other parts of these cars? I think I remember reading royal purple for the diff, but wasnt sure if that was the general consensus everyone found out to be the best. I tried a search but only came up with one post that also lead to royal purple. Also, what to use in the auto trans? 

[Arabas]

Kelu has gone with Motul (both for manual tranny and diff). maybe he can chime in.
how many miles do you have on it ophidia?

[Kelu]

I don't know if Motul is available in US.

[ophidia31]

Just rolled over 22k miles. I want to switch out the trans fluid with fresh before it gets to the point of it being better to leave the old stuff in. This way I know when it was changed as well. Same goes for the rear end. Ill have a timeline to go by whether or not those things were done by the previous owner or dealership.

[Carbon Sky]

If you're already an AMSOIL fan, you can go with their Manual Transmission and Gear Lube (MTG) in 75w-90 with a little slip additive for the LSD, and their synthetic ATF as well.

In terms of ATF, honestly, nothing readily available even touches AMSOIL's ATF.  It's what all the serious commercial/diesel people use.

I stockpiled a bunch of AMSOIL back in the day when it cost me under $6 (~$5.50) CDN for a quart of 5w-30.  I also got a case of ATF, 3-4 cases of 4 gallon jugs of 5w-30, a case of MTG, a gallon jug of their PI fuel system cleaner, their synthetic extreme pressure grease in aerosol and in a tube as a paste, oil filters for previous cars, and a case of 5w-40 for my dad's old Volvo 850 Turbo Wagon pushing ~350 ft lbs of torque.  I'm just finally finished the 5w-30 recently, have a bottle or two of the MTG left, 1/3 of the fuel system cleaner, lots of the paste grease, and 2 cans of the aerosol left, finished off the oil filters for the previous car, and my dad finished the 5w-40 a while ago.

I have to shop around for some more 5w-30, and it's now like $11/quart for what I used to get for under $6 

Oh, and I still stick to the DIC's recommended oil change interval, which for me is about 13K km, and about 10-11 months, and only because I'm using AC Delco (GM OE) filters.  If I were running AMSOIL oil filters, I'd go longer.  I have put my gear and LSdiff lube in about 2+ years ago now.  I probably will leave it in till its 5 year birthday, then swap it one more time with AMSOIL again.  Mostly preventatively.