Amsoil synthetic!

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I have a problem with water getting in my front diff so I use full synthetic all the way around 75W 90 Lucas full synthetic. The best protection if there is a chance of water getting in.

 

Just a semi synthethic. I tend to change both diffs when I do the motor oil change. Only takes a 1/2 hr more and I already have the pan and tools out anyway. Only adds $3-4 a time, it is cheap insurance

 

How much oil does the front and rear diff take?

My buddy has an 08 700 and he just called and said he almost put a full quart in the rear. On my Kodiak, the fill plug is way down on the side of the case....is there a separate plug on the side of the gizz case??

 

your buddy didnt look at the owners manual and overfilled his final drive to the fill plug and not the check plug on the side:deal:

 

If you fill the rear diff to the fill plug it will burp oil out the vent hose at highspeed. If you are sitting behind your machine look on the right side of the rear diff toward the front you will see a 10mm bolt remove this bolt and fill your diff until oil runs out the hole then replace the bolt and fill plug. A quart should do both front and rear diff's with oil left over. I my self am running Mobil 1 full synthetic but any synthetic (Amsoil, Royal Purple, Lucas, etc.) will suffice. If you decide to run a conventional oil I would at least use a hypoid gear oil.

 

Thanks everyone. The last time I changed it I used a hypoid gear oil from my Yamaha dealer. 1 quart did both diffs with some left over. After trying a semi syn in the engine, I was couirous if people liked it in the diffs. I quess it's a big YES

 

I've never had any issues just using Yamalube...

 

And was anyone elses rear diff drain insanely tight when you first changed it? Thanks all

Yes. So tight I couldn't get it out, so I flipped my grizzly up on the rear rack, got the torch out to heat it up and light my Grizz on fire. BIG BIG FIRE!! Oops I forgot to turn the gas valve off and it was leaking gas out of the carb I guess. Luckily no major damage, I just had to clean fire extinguisher dust off of everything.

But when I finally did change the gear lube I had some of this left over from another job so I used it.

 

Glad to see that I was not the only one who had a VERY tight drain plug in the rear diff from the factory. All of the others were about as they should have been, but when I tried to loosten the rear diff plug I kinda messed up the flats on the allen bolt. So I had to tap a long handle ratchet into the plug, and pull very very hard. I honestly thought It wasn't going to come out, but after repeated trys, it did.:lala: I had to buy a new drain plug, and installed it with the proper torque from the service manual.:deal: No where near as tight as it first was.

 

I just did my first diff service on my new Grizzly and it was the same way and result. The front was at the proper spec and the rear... Somebody from the factory gorilla tightedned it on there. I am going to get a new drain plug tomorrow as this one is roached. Glad it finally came off.