rear diff fluid question

[Army97]

What gear oil should I put in a '97 3.4 with the factory locker?

The haynes say's SAE90, but in my research many people on here say 75W-90 for rear, t-case and front...

 

[PitbullRescuer]

I used 75W-90 to change mine, works fine for me.

 

[Beach Runner]

^ Ditto, no problems to report.

 

[IanB]

75W-90 over here as well.

 

[Army97]

I was just at the dealership to pick up the crush washer and they looked in the computer and said 80W-90 so I bought that. Sounds like either one will work just fine.

 

[cfranck1]

I think the book actually says the rear diff gets 80w90 and the other two get 75w90..

But I did like the other posts, I just used 75w90 in all three. Just makes it easier when buying it. You will be fine with the 75w90..

 

[SIKHILUXSURF]

redline 75w90 in all 3 no problems

 

[Mellow77]

I used Royal Purple's 75W-90 in all 3 of mine; loving it.

 

[A.Wilson013]

I used Mobil 1 75-90 synthetic in all 3 of mine.

Where are you stationed?

 

[Brilliant]

80W90 is the dino, 75W90 is synthetic. Either are fine, I put in synthetic.

 

[awdjunkies]

Do you guys use 75w90 shockproof? superlight, heavy, or lightweight?

 

[Nelsonmd]

I use this all around:

Valvoline/1 qt. 80W-90 Durablend synthetic gear oil (280) | Gear Oil | AutoZone.com

 

[Stick Figure]

Do you guys use 75w90 shockproof? superlight, heavy, or lightweight?

Truck has the heavy shockproof in everything. Most of my cars i run the lightweight shockproof. you will probably be find with either though. Best gear oil you could ever run. Especially for a manual trans.

 

[awdjunkies]

Truck has the heavy shockproof in everything. Most of my cars i run the lightweight shockproof. you will probably be find with either though. Best gear oil you could ever run. Especially for a manual trans.

Awesome!! Thanks, and yes, I too run LW in my cars as well. :cheers:

 

[Jeffkin]

Does anyone know if we should use any special additives in addition to the gear oil and does it matter what type of gear oil? (GL4, GL5...)

 

[clys]

No additives are neccessary

 

[Gerdo]

Does anyone know if we should use any special additives in addition to the gear oil and does it matter what type of gear oil? (GL4, GL5...)

You want GL-5 in gears.
You want GL-4 in manual transmissions. The extra surfer in a GL-5 can damage the syncros.

 

[potomacduck]

Does anyone know if we should use any special additives in addition to the gear oil and does it matter what type of gear oil? (GL4, GL5...)

You're overthinking this. I use the 75-90 cheap dino oil from Walmart and change it every 50,000 in the diff and transfer case.

326,000 miles later.......no problems.

.

 

[BDow]

Rather than do a whole new forum post I thought I'd join in on this thread and ask a quick question similar to OP.

I'm about to do my differential fluid change as well and bought some MasterPro GL-5 80W-90 Gear Oil. However, my manual says that you should only buy 80W-90 if the car is operating at temperatures below 0 degrees F (I have a 2000 rear wheel drive 4Runner). For temperatures above that it says to get SAE 90.
Does this honestly make any difference? I don't want to put in the wrong stuff, but I just wanted to make sure. What do you guys think?

 

[MandAtaco]

I've always ran Mobil 1 75W-90 in all 3 and the crawler. This worked in my 01 Taco, 96Runner, 04Runner, and my 00Runner.