Front/Rear Diff & Transfer Case Fluid

Howdy folks!

I will be preforming maintenance on my 08 Tundra (4x4, 5.7L V8) for Front/Rear Diff & Transfer Case Fluid. I am seeing what everyone else is using.

For front/rear Diff I will be using Valvoline Flexfill SAE 75W-90 Full Synthetic Gear Oil
^ Has anyone used this? Is there something different you would recommend?

Also, does this make a difference if my truck has limited slip or not? How do I find out if my truck has that?

$51 Valvoline Flexfill SAE 75W-90 Full Synthetic Gear Oil 1 QT, Case of 4

https://www.amazon.com/gp/product/B08K9CGB6Y?ie=UTF8&th=1

Transfer Case:

RAVENOL J1C1003 SAE 75W Gear Oil - MTF-3 Full Synthetic
^ Same question above, has anyone used this? Is there something different you recommend?

TIA

 

Both solid choices. As long as it meets the factory spec you really can't go wrong. I like toyota 75w even tho it's expensive but using 2 quarts every 30k miles I can live with that.

 

Do you know if the options matter if I have limited slip or not?

 

If you have a true LSD in the rear, recommend you use Lucas. Much discussion in the FGT section

 

How can I tell if I do? Do you have a link to Lucas?

 

‘07+ did not have a factory limited slip option. Only simulated LSD via differential braking. So it it’s stock, you do not need friction modifier.

You can use 75W90 in your transfer case too, it’s the ‘14+ t-case that takes the weird stuff.

 

Awesome! I appreciate the info! I can use the valvoline option as well in the transfer case? (just want to clarify)

 

I’m certain I used 75w90 (Chevron Delo full synthetic) in mine, it met the specs. If you have your owner’s manual handy, you can check the fluid spec and make sure the Valvoline meets it.

 

Some report better shifting with Ravenol 75W in the TC of the 14+ trucks

 

I just searched at other discussions on this forum as well - it appears the big 3 people use are Redline, Lucas, and Mobil1 (for diffs)

 

Ravenol everywhere. Transfer case shifts into 4HI and back muuuuuch better with MTF-3 than it ever did with Toyota.

 

I used Amsoil Severe Gear for the diffs without issue.

 

I recently did this service myself. Went down the rabbit hole of what fluids to use, etc. I ended up using the valvoline you mentioned for rear diff and transfer case. I could not get the front diff drain bolt to come loose...bolt started to warp, so I stopped. Will be tackling it again with heat at some point. So far no issues with the fluid I used, granted I haven't driven that much since the fluid change. I will say the transfer case fluid was SUPER clean when it came out. It was changed at 30K miles and I did the latest change at 105K miles. Wish I left the transfer case fluid alone as I think it was the Toyota 75W fluid because the last service was done at the dealership. I was surprised at how clean the fluid was. I live in a state where we switch from 2wd to 4wd a lot too (Alaska).

You can get by without a hand pump for rear diff. The tfer case I did have to use the pump as the squeeze bottle wouldn't fit. The pump would be needed for front diff as well.

 

I'm just using 80W-90 GL-5 conventional gear oil in my transfer case and both diffs. I figure, it's going to shear down to a 75W anyway. I'm at over 250,000 miles and my transfer case and differentials are still working smoothly.