There is no "Limited Slip" on the 10.5" Tundra axle...no additive required, however it is just fine to use an oil with the additive already in it. The Auto Limited Slip Differential (ALSD) is nothing more than the breaks being applied to the slipping wheel to send power to the one with traction; it's emulating a true limited slip.

 

Severe Gear 75w-90 doesn't require an LSD additive. It says so right on the bottle.

 

I was just curious because on the website it stated if chattering was experienced to add the slip lock. I like what the Severe gear has done for the FJ and wanted to add it in the Tundra, guess I need to understand the Tundra axle a little better.

 

So you guys are saying a 2008 Tundra DC 4x4 doesnt need the additive? Im about to do mine as well and thought I needed the additive?

 

So you guys are saying a 2008 Tundra DC 4x4 doesnt need the additive? Im about to do mine as well and thought I needed the additive?

No. All this information is in the manual.

There is NO limited slip in the 10.5" axle for the Tundra. No additive is NEEDED. However, it will not cause harm if the product already has it in it.

 

As stated no need for the additive as the Tundra 10.5" doesn't have a mechanical limited slip. Instead it is a computer controlled traction aid where the brakes are used to stop a spinning wheel and route power to the side with traction. I think it works pretty well, others disagree.

 

I think I was gonna run Royal Purple 75W-90 but got to get past the cost since the rear holds 3-4 quarts doesnt it? I saved instructions from another Tundra sight on how to do this. Was unaware that oil ran all the way to the wheels on the Tundra.

But I couldnt find any info on how to do the transfer case and front diff? Anyone have a write up on this?

 

I think I was gonna run Royal Purple 75W-90 but got to get past the cost since the rear holds 3-4 quarts doesnt it? I saved instructions from another Tundra sight on how to do this. Was unaware that oil ran all the way to the wheels on the Tundra.

But I couldnt find any info on how to do the transfer case and front diff? Anyone have a write up on this?

http://www.tundrasolutions.com/forums/tundra/115922-diy-change-rear-differential-fluid-07-a/

This is the easiest maintenance job on this truck. Also skip the Royal Purple it starts out with really high viscosity but has a hard time maintaining it.

http://www.syntheticwarehouse.com/brochures/g2457_gearlube_study.pdf

For the money and convenience I just went with Mobil 1.

 

So just standard syntetic Mobil 1 75w-90 will work for rear diff, front diff and transfer case?

 

So just standard syntetic Mobil 1 75w-90 will work for rear diff, front diff and transfer case?

Yep. In fact when I had the front diff replaced under the TSB the fill the dealer used was Mobil 1 Synthetic 75w-90 per the work order.

If you really want to spend the extra $$$ see if you can find the AMSOIL since it does seem to be the real deal. I don't know if I'll go that way next time or not since I plan on changing out the fluid every 25,000 miles or so.

 

PC price on the Amsoil SG is $10 per quart plus shipping.

There's not a better gear oil on the market IMO.

I must agree on the Royal purple; it's not so good.

The rear takes 4 quarts, the front takes 2.2 or so, and the center diff takes 1.20 quarts.

Kudos to the OP for changing it early; this will get all the break in material out which is very important. I dropped mine at 5k as well, and it proved to be a good move as the fluid was horrible looking coming out.

 

PC price on the Amsoil SG is $10 per quart plus shipping.

There's not a better gear oil on the market IMO.

I must agree on the Royal purple; it's not so good.

The rear takes 4 quarts, the front takes 2.2 or so, and the center diff takes 1.20 quarts.

Kudos to the OP for changing it early; this will get all the break in material out which is very important. I dropped mine at 5k as well, and it proved to be a good move as the fluid was horrible looking coming out.

You forgot to mention that Amsoil Severe Gear is less expensive than Mobil1 Gear Oil. :tu:

 

When I changed the FJ diffs and TC to Severe Gear, the smoother shifting was incredibly noticeable. I don't know about the mileage some have claimed but a better ride for sure. I am sure the early change in the Tundra will be less of performance enhancer.

AMSOIL website is awesome, I been doing it now for about three years. Since the FJ I have started to do the diffs, and lube with their synth 2000 series grease. The best part about the whole preffered customer deal is your build sheet is right their with capacities, weights, filters, wipers... the whole 9.

 

Maybe less of a performance enhancer, but more of a temperature decreaser, wear reducer, and prolonged life excpectancy enhancer. Just to name a few.
Towing 12k lbs last summer with my tundra in the dead of summer, got IF thermometer readings on all diffs less than 163 degrees F. That's running Amsoil SG in them all, and i know from previous temp readings towing. The Amsoil reduced temperatures between 8+ 10 degrees, just by simply switching brands.

 

I am doing my gear oil. I am going to use AMSOIL SEVERE GEAR. 75W-90. I hope I don't need the LS additive....

 

I changed mine 2 weeks ago in my 2010 DC.Used Amsoil Severe Gear 75-90 (4 quarts). Mileage at 13000 miles was 16.9 before changing rear-diff fluid. This week,it's 17.2 MPGs,was it the Amsoil or...... coincidence?

 

Changing your engine oil can have the same results. But I'd like to think that the Amsoil has created less friction in one of the heaviest friction areas of your Tundra. :tu: