Diffs and transfer case fluids

[Kraze]

I'm trying to decide between the Redline 75w90 and Amsoil Severe Gear 75w110, but I have a couple of questions.

1. I take it, if I go with the Redline, I want the non-limited slip one for both diffs and the transfer case?

2. If I go with the Amsoil, would that also work in the transfer case, or should I stick to the Redline 75w90 in there?

3. And finally, should I go with the Redline or Amsoil?

Factors that might affect my choice: I live in San Diego county, but often make trips up to the Mojave desert, where it can easily get above 100 degrees in the summer. At the moment, I don't ever tow anything, but I might later on. I try to go wheeling as often as I can, which works out to maybe once every month or two.

Thanks for any suggestions.

 

[AZTOY]

I Don't use those products. I just buy fluid from dealer and use what they recommend. Works for me.

 

[JEL]

75w90 is what you'll want and the 90 is what's spec'd for the 4runners. IIRC it's 85w90, but that 75w or 85w is just the cold weight, the 90 will be nearly identical between the two, and that's the full operating temperature weight.

I used 75w90 all around in mine (front, rear, transfer case), so I would use the 75w90 stuff, other synthetics work just fine too as long as they're GL5 and the proper weight. Limited slip additive won't hurt anything in there, but if you had LSD (as far as I know these rigs never came stock with LSD) then you would need it.

When doing the rear diff it would also be a good time to look at the axle seals for leaks.

 

[Kraze]

Nope, no LSD on mine, just the factory rear e-locker. So the Redline 75w90 without limited slip additives would be fine to run in that?

 

[downpour11]

Nope, no LSD on mine, just the factory rear e-locker. So the Redline 75w90 without limited slip additives would be fine to run in that?

Yup that's the recommended weight. If you go to a shop it will say 'ADD75w90'. I think most of us on here use 75w90 or 80w90.

 

[Kraze]

Thanks. I ordered the Redline 75w90 non-limited slip. It was easier to get than the Amsoil anyway.

 

[Jaystoy]

Mobil1 syn gear lube 75/90 readily available better price.

 

[Stick Figure]

too late for the original poster now, but I swear by Redline Lightweight shockproof.

This transmission (Supercharged MR2) ....

....sat on the shelf for 2 years after draining it before I opened it up to make some changes to it. After that long the residual fluid is still stuck to every last tooth of every gear. I've never found a fluid thats better than that.

 

[TheeMikeB]

Funny I was just looking into new Gear Lubes since I'm putting in front/rear ARBs and was just going to do the Royal Purple and then decided to do some research. I came across this article and I was stunned. RP got one of the worst ratings right after Lucas.

http://www.goodsenseoil.com/G2457-GearOilWhitePaper.pdf

Read and make you own choice but I can tell you after spending over 2Gs on gears and lockers i'm putting in some Amsoil.

 

[02SE]

A gear lube "study"* put out by Amsoil..















*I.E.: Blatant, biased, advertising

 

[Kraze]

too late for the original poster now, but I swear by Redline Lightweight shockproof.

This transmission (Supercharged MR2) ....

http://www.mostdesigns.com/zgallery/cache/Personal%20Vehicles/MR2/26_G_w434_h580.jpg[IMG]http://www.toyota-4runner.org/3rd-gen-t4rs/

....sat on the shelf for 2 years after draining it before I opened it up to make some changes to it. After that long the residual fluid is still stuck to every last tooth of every gear. I've never found a fluid thats better than that.[/QUOTE]

I was actually looking into the shockproof as well. Oh well, maybe next time I'll go with that. Thanks for the info!

[QUOTE="TheeMikeB, post: 1309488, member: 47731"]Funny I was just looking into new Gear Lubes since I'm putting in front/rear ARBs and was just going to do the Royal Purple and then decided to do some research. I came across this article and I was stunned. RP got one of the worst ratings right after Lucas.

[url]http://www.goodsenseoil.com/G2457-GearOilWhitePaper.pdf[/url]

Read and make you own choice but I can tell you after spending over 2Gs on gears and lockers i'm putting in some Amsoil.[/QUOTE]

Looks like Redline came in 5th on there. No surprise Amsoil came in first in their own study. An interesting paper nonetheless. Thanks for the link!

 

[bekindpleaserewind]

If I put redline MT90 in everything can it hurt anything other than my wallet?.. Just bought 97 2wd 2.7 and idk when the fluids were last serviced.

 

[phattyduck]

If I put redline MT90 in everything can it hurt anything other than my wallet?.. Just bought 97 2wd 2.7 and idk when the fluids were last serviced.

GL4 is good for a manual transmission. don't use it on hypoid gears. GL5 only for the rear diff, in your case. You don't need anything special in that rear diff... Just GL5 75w90 or 80w90.

-Charlie

 

[Mark_BC]

I ordered some Amsoil GL4 for the manual transmission last week. The guy on the phone was telling me about how a guy he knew used to work for Audi and he eventually quit after seeing them sell Audi brand lube which was just Mobil 1 repackaged, and seeing the customers come back with problems from this. Also he said that a guy he knew opened up an engine that was running Amsoil and said it looked brand new, he couldn't believe it. How much of that is hyperbole and salesmanship, who knows. But mine seems to shift a bit better now.

 

[bekindpleaserewind]

GL4 is good for a manual transmission. don't use it on hypoid gears. GL5 only for the rear diff, in your case. You don't need anything special in that rear diff... Just GL5 75w90 or 80w90.

-Charlie

Thanks, ended up doing Mobil1 75w90.