[KBToys]

Plan on changing oil on my front/rear diff's and transfer case in my 07 V8 4R. I plan on using redline oil(had good luck using in my tacoma). From the search I did, I was unable to find which one I should buy. Also does transfer case need something different that what the diff's use?

Here are the ones I am looking to buy, but not sure which one to buy

75W85 GL5
75W90 GL5
75W90NS GL5

[firebirdguy]

front diff & xfer case take 75/90. any name brand fluid will work as good or possibly even better than redline for a lot less $$, i use valvoline & many others use mobil 1. Nothing wrong with redline though & is of course your choice what you prefer to use.

for rear diff the manual says 90wt if above 0f temp & 80/90 below 0f. most people use a 80/90 conventional or 75/90 synthetic with great results, a little better MPG & works great in winter temps & is still a 90w once warmed up in summer temps. i recall reading a toyota service bulletin that said after 2007 or 2008 they started using 75/90 synthetic in the rear diff. but i could be wrong, cant remember where i read that.

[triethylborane]

75W90 with the additives is what I used on front and rear diffs, doesnt matter as they do not have LSD so its fine. I recently used a Valvoline bag of synthetic gear oil and that was very easy . . . so easy it might be my go to for general use. Might have to keep a bag around.

[djpope09]

Originally Posted by triethylborane

75W90 with the additives is what I used on front and rear diffs, doesnt matter as they do not have LSD so its fine. I recently used a Valvoline bag of synthetic gear oil and that was very easy . . . so easy it might be my go to for general use. Might have to keep a bag around.

Valvoline™ FlexFill™ Full Synthetic Gear Oil : Product Catalog - Valvoline™

Is that the bag you're talking about? I've never seen those, but that looks like a great idea vs using a pump to get the gear oil in.

[triethylborane]

Originally Posted by djpope09

Valvoline™ FlexFill™ Full Synthetic Gear Oil : Product Catalog - Valvoline™

Is that the bag you're talking about? I've never seen those, but that looks like a great idea vs using a pump to get the gear oil in.

Yes, thats the product. Very easy to use and I kept a few bags to use in the future. Such a small and incremental change but huge returns . . . it took probably two minutes to fill the rear diff on my full size truck.