If I have a contribution to a thread then I will make it. If I don't have anything constructive (or sarcastic) then I will pass on it.

 

I dont meen that you write on every thread, I ment I was lookin you your imput in mine, I wanted to see what your Opinion was..

 

I think you have to make a choice. I use Valvoline blended but may switch to full dino after hearing that it is recommended by Currie. My buddy has Moser axles in his 55 Chevy with a 504 big block and a custom Moser rear and he was told by then to use RP and was going to use that too on my next diff oil change but not after hearing the Currie warning. I will consult with Randy's R&P ppl then decide.

 

I knew there was a reason my gut always tells me not to use synthetic oils....I remember a Toyota mechanic once told me if I was to put synthetic oil in my wifes Camry then if there was an issue with the motor and such Toyota may not warranty it... I plan on switching to 85-140 on my next diff change since I will be wheeling it heavily at that point...

 

It's nice to have a technician from Currie on our boards. Welcome

What's in synthetic oil that causes these gear issues?

 

Good idea.

The wire brush trick does make a mess if you don't control the direction of the brush. I do one half with the drill in forward and then the other 1/2 with the drill in reverse so it throws all the mess away from the gears. i don't usually worry about the debris that goes flying in because i wait till last to clean out the differential (right before cover goes on).

 

Toyota wouldn't be able to deny your warranty unless they could prove you used a lubricant that didn't meet the specification. They can not tell you whether you can use Synth vs. Dino.... The Magnuson-Moss warranty act provides specific protections to you in these instances.


But yes... I am a long time Synth user in my diffs.

I have 75w-140 full synth in in both ends. And my Detroit EZ-Locker is quiet in the rear.

 

On the left is an open carrier.

On the right is a Trac-Loc limited slip.

 

Thanks for voicing that information about warranty denial. As long as the product say 75w90 which is what I use in my front diff and transmission. I believe that the front diff calls for a 80w90 GL-5 gear oil. As long as you use a lubricant with the GL-5 classification then you will be okay. I use 75w-90 GL-5. I use a 75w-140 GL-5 in my rear differential with a lube gaurd limited slip additive. In my 99 there is a sticker in the glove box stating that I have a limited slip differental. I think you can call your local dealership with the vin# and get a build sheet on your particular jeep.

 

Thanks! I have been here a wile

Its not whats in syn its what is not. Rear end gears slide across each other rather then interlock and grab. Synthetic oil doesnt contain the minerals needed to cusion the ring and pinion properly.

 

Like I said, with gear oil it doesn't matter if it's syn or non syn. All GL-4 oils meet GL-4 specs no matter what. Same thing goes for GL-5. A synthetic 75W90 GL-5 will supercede a 80w90 GL-5. A 75w90 GL-4 however will not. There are different contents too each. So what I'm saying is just stick with the GL classification and you will be alright regardless of viscosity and syn or non.

 

I just wanted to let you guys know that in my haynes manual that the transmission ax-15 and ax-5 calls for a 75W90 gl-5 and the computer at my work calls for a 75w90 gl-3. The gl-3 has been superceeded by the gl-4 and the book calls for a gl-5! After talking with a few guys it seems that the only difference in the gl3 and gl4 is the gl4 is mineral base and the gl3 is more of an oil base. If you have worked on the newer v-dubs then you know that the power steering fluid is a mineral base and can not use a conventional ATF or regular PS fluid. The GL-5 has more of a sulfer content than the other 2 fluids and right now all I can see is that they are all close to the same thing.

 

Any brand of 75-90 front and 75-140 rear. This is what i have on my XJ '93 with LCD. I go every where on the Greek mountains and i help as the last car at Trail Raids. Never had problem with the diffs but i change the oil every year becouse of this use.

 

You from greece?