Changing my diff and transfer case fluid

About to change my front and rear diff fluid along with my transfer case fluid. I know its

$30 75W-90 Synthetic Gear Lube - 1 Quart (Pack of 2)

75W-90 my question is does it really matter what kind i use as long as the weight is good? I have over 100quarts of 75W-90 Can-Am diff fluid and was wondering if it mattered?Also wheres the best place to get the LSD additive as i have the TRD Sport Model. To my knowledge this will be the first fluid change its had in its 120,000 mile life.

 

Well being the person i am i found out the Canam fuild is GL5 full synthetic so YES it can be used todo the diffs and transfer case. Everyones silence was amazing. But considering its $33 a quart for the average person i guess this will only benifit me. So ill be the Taco running BRP gear oil

 

Glad you answered your own question I assume you're the new owner. If so, congrats! I have an 05, same color as yours, and just hit 129k. Still going strong.

 

Yes sir 2nd owner and shes about to roll over 122K fantastic trucks i must say!

 

****NO!!!!****
That is not necessarily the case.
THE TRANSFER CASE HAS BRASS SYNCHRONIZERS!!!! (for [dis]engaging the front output shaft)
For the transfer case, you MUST use a gear oil that is compatible with a **synchronized manual transmission having brass synchronizers**.

 

For the rear diff... If the gear oil type is designated "limited slip formula", the additive is not necessary correct? Might be a dumb question, have to ask though. I use cheap oils in everything except the rear diff, only because it is limited slip with the locker.

 

use gl5. It won't hurt your brass synchronizer's, lots of people run gl5 for thousands of miles and it doesn't hurt a thing, including me. If Toyota reccomends it you're all good.

 

You have limited slip and a locker? I thought trd off roads with factory e locker had open diff.

 

Most gl5 oils are specifically made to be compatible with manual transmissions.
Thing is, he is talking about using a gear oil that is distributed by a SNOWMOBILE MANUFACTURER. Snowmobiles do not have synchronized transmissions. They have a CVT, along with a single ratio CHAIN CASE.

 

I missed the whole brp part. So if this is true I wouldn't recommend using it.

 

Depends. Some people with mechanical ls differentials report that even gear oils specifically saying that they have ls additive in them, will result in premature activation of limited slip, causes tire chirping when cornering. The solution is to add some more additive to the oil.

Also note that limited slip additive is a very bad thing for synchronizers.

 

I was under the impression that open diff meant no locker or limited slip? I believe I have both in the rear, I definitely have the elocker. My limited slip may be up front? Damn, where's my manual. I hate going to Toyota for gear oil, so expensive!

 

This I did not know. I have done this for many thousands of miles too. I may be draining some oil this weekend...

 

Limited slip additive is a friction modifier (reduces friction), and synchronizers are very friction dependent. So limited slip additive can contribute to harder shifting, gear grinding, etc.

 

I'm not 100% on newer Tacoma's, but I know my 2005 has a simple open diff with an e locker when needed. A limited slip differential was only found on the trd sport models as far as I know.

 

Right, you have a trd offroad. OP has a trd sport. Electronic LSD was a feature added for MY2009 for *all* models, so any trd sport up to and including MY2008 will have a mechanical LSD.

 

I should have been more clear with who I was responding to, NM Lance. He's profile just says 2014 trd.

The electronic LSD is basically done through the abs system, so no need for friction additive for the rear diff in those models.

 

Between the two of you, you have answered my question (thank you!). I use 80W-90 in the rear instead of Toyota's 85W-90, so I may buck-up and buy Toyota's overpriced crap in addition to the friction modifier.

I may end up switching to the redline MT90 in my transmission, if it is as good as everyone says. I definitely used limited slip oil in my transmission at the last oil change, so I will probably just drain and refill with MT90, once again, just to be on the safe side.

I have always used cheap/on sale oil in everything, the only thing that concerns me is the elocker. I definitely don't want to ruin that.

 

BRP does side by sides, Jet Skis, 4 wheelers.....hell im surprised they dont have a car out yet lol the oil i used actually exceeds Toyota standards. So im running at 150% currently.

 

And if you enjoy owning crap that breaks down in a severe manner at 100 km intervals, then go ahead and go with them. Personally, I've seen enough bombardier crap break down badly enough that I'll avoid even being within a hundred feet of anything they make for fear that it will shoot parts out at dangerous speeds.